The relative pH at the equivalence point of the titration of a weak acid with a strong base is pH > 7.
The equivalence point in titration is the point at which the amount of added titrant is just enough to completely neutralize the analyte solution. The equivalence point can be found from an acid-base titration curve by the inflection point of the curve. In titration, the equivalence point occurs when the number of moles of titrant is equal to the number of moles of the analyte. For the titration of a weak acid with a strong base, the equivalence point will have a pH greater than 7. This is because the strong base will completely neutralize the weak acid and any excess base will increase the pH of the solution beyond neutrality.
In other words, the solution has become basic because of the excess hydroxide ions added from the titrant, despite the fact that the original substance being analyzed (acetic acid) was acidic. Therefore, the relative pH at the equivalence point of the titration of a weak acid with a strong base is greater than 7.
Know more about Equivalence point here :
https://brainly.com/question/24584140
#SPJ11
if 0.23 moles of acetic acid and 8 grams of oxygen gas are placed in a reaction vessel and a combustion reaction takes place, what is your limiting reactant and corresponding theoretical yield of water?
Here O2 is the limiting reactant and the corresponding theoretical yield of water is 3.00 g of H_2O
Here 0.23 moles of acetic acid and 8 grams of oxygen gas are placed in a reaction vessel and a combustion reaction takes place.
To find out the limiting reactant and corresponding theoretical yield of water, we need to solve this question by following the below steps:
Step 1: Balanced chemical equation for the combustion of acetic acid.`2C2H4O2 + 6O2 → 4CO2 + 4H2O`
Step 2: Find the molar mass of each compound.`
Molar mass of C2H4O2 = (2 x 12.01) + (4 x 1.01) + (2 x 16.00) = 60.05 g/mol
Molar mass of O2 = (2 x 16.00) = 32.00 g/mol
`Step 3: Calculate the number of moles of each compound.`Moles of C2H4O2 = 0.23 mol
Moles of O2 = (8 g / 32.00 g/mol) = 0.25 mol
Step 4: Determine the limiting reactant. The limiting reactant is the reactant that is completely consumed in the reaction.
Moles of C2H4O2 = 0.23 mol
Moles of O2 = 0.25 mol
Now 2C2H4O2 + 6O2 → 4CO2 + 4H2O
Therefore, O2 is the limiting reactant.
`Step 5: Next we have to calculate the theoretical yield of water.Theoretical yield is the maximum amount of product that can be produced from the limiting reactant.`Moles of O2 = 0.25 mol
We can see that for every 6 moles of oxygen, we get 4 moles of water .So, for 0.25 moles of oxygen, we get the following amount of water:(4/6) x 0.25 = 0.1667 moles of water
Molar mass of H2O = (2 x 1.01) + 16.00 = 18.02 g/mol
Theoretical yield of water = Number of moles of water x Molar mass of water`= 0.1667 mol x 18.02 g/mol = 3.00 g of H2O`So,
The limiting reactant is O2 and the corresponding theoretical yield of water is 3.00 g of H_2O.
To learn more about acetic acid : https://brainly.com/question/30759995
#SPJ11
Determine if the following statements are true and false. Type true or false in the space provided.
Part A
To rinse the entire inner surface of the buret, one should add water from a wash bottle while rotating the buret.
Part B
Rinsing the buret with water is always enough to clean the buret.
Part C
To clean the inner surface of the buret, one should wash it with soapy water three times .
Part D
After rinsing with water and soapy water solution, one can add the titrating solution and begin the titration.
Part E
Always rinse a buret with the titration solution three times before beginning a titration.
The given statements are accordingly true and false: Part A: True, Part B: False, Part C: False, Part D: False, Part E: False.
Part A: True. To ensure that entire inner surface of the buret is rinsed, water should be added while rotating the buret.
Part B: False. Rinsing the buret with water alone is not always enough , residual substances may adhere to the surface of the buret.
Part C: False. It is not always necessary, and may even be harmful if the soap is not thoroughly rinsed off.
Part D: False. The buret should be thoroughly rinsed with distilled water.
Part E: False. While it is important to rinse the buret with the titration solution before beginning a titration.
To know more about titration, here
brainly.com/question/2728613
#SPJ4
8. Consider the following reaction
Ca(s) + 2HCl(aq)-> CaCl2(aq) + H₂(g)
Using the limiting reactant concept, how many moles of hydrogen can be produced from the reaction of 4.00
moles of calcium and 4.00 moles of hydrochloric acid?
a. 0,50 moles
b. 1.00 moles
c. 1.50 moles
d. 2.00 moles
e. 4.00 moles
Answer:
The balanced chemical equation for the combustion of ethane is
2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l)
The stoichiometric ratio between C₂H₆(g) and CO₂(g) is 1 : 2
Hence,
moles of CO₂(g) produced = moles of reacted C₂H₆(g) x 2
= 1.00 mol x 2
= 2.00 mol
Hence, the correct answer is "C".
fractional precipitation can one type of cation be removed from an aqueous mixture of multiple cations by precipitation?
Fractional precipitation is a method used to separate different cations from a mixture by selectively precipitating one type of cation while leaving the others in solution. This method is based on the solubility differences of the cations' salts in a solvent, typically water.
To remove one type of cation from an aqueous mixture of multiple cations, a suitable reagent is added to selectively precipitate the desired cation. The precipitate formed can be separated from the solution by filtration or centrifugation. The remaining solution still contains the other cations that did not precipitate.
For example, to remove calcium ions (Ca2+) from a mixture containing calcium, magnesium, and zinc ions, ammonium oxalate can be added. This will form a white precipitate of calcium oxalate, which can be separated from the solution. The remaining solution will still contain the magnesium and zinc ions.
Fractional precipitation is a useful technique in analytical chemistry for the separation and identification of cations in a mixture.
To learn more about Fractional precipitation refer to:
brainly.com/question/28609797
#SPJ4
calculate the gradient of the line
The gradient of the line passing through the points (2,3) and (5,7) is 4/3.
The gradient of a line is calculated by dividing the difference in the -coordinates by way of the distinction in the -coordinates. This might also be referred to as the trade in divided by means of the exchange in , or the vertical divided by way of the horizontal.
How do you calculate gradient formula?The gradient equation is another way we refer to the gradient of a straight line the usage of x and y coordinates. So once more the gradient equation is viewed as m = upward jab / run where m is the gradient or slope.
What is the components for gradient of linear graph?Finding the gradient of a straight-line graph
The gradient (also known as slope) of a line passing through two points (x1, y1) and (x2, y2) is given by:
gradient = (y2 - y1) / (x2 - x1)
Using the given points, we can calculate the gradient of the line passing through (2,3) and (5,7) as follows:
gradient = (7 - 3) / (5 - 2)
= 4 / 3
Therefore, the gradient of the line passing through the points (2,3) and (5,7) is 4/3.
The gradient of the line = (change in y-coordinate)/(change in x-coordinate)
Learn more about gradient here;
brainly.com/question/29578324
#SPJ9
Complete question:
Calculate the gradient of the line passing through the points (2,3) and (5,7).
The molar heat of vaporization for liquid water is 40.6 kj/mole. how much energy is required to change 25 g of liquid water to steam if the water is already at 100oc?
To convert 25 g of liquid water to vapor at 100°C, we need 67.7 kJ of energy.
To change 25 g of liquid water to steam, we need to calculate the energy required for the following two processes:
Heating the water from 100°C to its boiling point at atmospheric pressure (100°C).
Vaporizing the water at its boiling point at atmospheric pressure (100°C) to steam at the same temperature.
Let's start with the first step. The specific heat capacity of water is 4.18 J/g°C, so we need:
q1 = m * c * ΔT
where
m = mass of water = 25 g
c = specific heat capacity of water = 4.18 J/g°C
ΔT = change in temperature = (100 - 0)°C = 100°C
q1 = 25 g * 4.18 J/g°C * 100°C
q1 = 10450 J
This means that we need 10450 J of energy to heat 25 g of water from 0°C to 100°C.
Now let's move on to the second step, which is vaporizing the water. The molar heat of vaporization of water is 40.6 kJ/mol.
Since we know the mass of water (25 g), we need to convert it to moles:
n = m / M
where
m = mass of water = 25 g
M = molar mass of water = 18.015 g/mol
n = 25 g / 18.015 g/mol
n = 1.387 mol
The energy required to vaporize the water is:
q2 = n * Δ[tex]H_v_a_p[/tex]
where
Δ[tex]H_v_a_p[/tex] = molar heat of vaporization of water = 40.6 kJ/mol
q2 = 1.387 mol * 40.6 kJ/mol
q2 = 56.3 kJ
Therefore, the total energy required to change 25 g of liquid water to steam at 100°C is the sum of q1 and q2:
q = q1 + q2
q = 10450 J + 56.3 kJ
q = 67.7 kJ
So, we need 67.7 kJ of energy to change 25 g of liquid water to steam at 100°C.
To learn more about heat of vaporization refer to:
brainly.com/question/29401184
#SPJ4
We must take into account the following stages in order to determine the amount of energy needed to convert 25 g of liquid water into steam at 100°C: Calculate how many moles of water (H2O) are contained in 25 g.
Number of moles of H2O = mass/molar mass = 25 g / 18.015 g/mol = 1.388 mol. The molar mass of H2O is 18.015 g/mol. Determine the amount of energy needed to evaporate one mole of water. Water has a molar heat of vaporization (Hvap) of 40.6 kJ/mol. Determine the amount of energy necessary to evaporate 1.388 moles of water. 1.388 moles of water must be vaporized in order to produce 40.6 kJ/mol of energy, which equals 56.4 kJ. Hence, 56.4 kJ of energy are needed to convert 25 g of liquid water to steam at 100°C. The molar heat of vaporization for liquid water is 40.6 kj/mole.
learn more about water here:
https://brainly.com/question/28465561
#SPJ4
Choose two reasons that the iodination EAS reaction can be described as "green." Select one or more: Use of renewable energy Use of a benign solvent Use of a less hazardous oxidant Use of a catalyst
The iodination EAS (Electrophilic Aromatic Substitution) reaction can be described as "green" because of the use of a benign solvent and the use of a less hazardous oxidant.
Therefore, the second and third option are correct.
What is a benign solvent?A benign solvent is described as one that is less toxic, less flammable, and has a lower environmental impact compared to traditional solvents.
We know that in iodination EAS reaction, green solvents like ethanol, ethyl acetate, and acetic acid are used instead of more hazardous solvents like chlorinated solvents.
In conclusion, the use of a benign solvent and a less hazardous oxidant in the iodination EAS reaction makes it a "green" reaction.
Learn more about benign solvent at: https://brainly.com/question/14746909
#SPJ1
2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O
In the above equation how many moles of N2 can be made when 19 moles of CuO are consumed?
The number of moles of N2 that can be made when 19 moles of CuO are consumed is 6 moles.
What does mole conservation entail?The law of conservation of mass can alternatively be referred to as the law of conservation of moles because mass can be mathematically translated into mass (the total moles on one side of the equation must be equal to the total moles on the other side of the equation). As a result, we can balance equations thanks to this law.
The balanced chemical equation is:
2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O
From the equation, we can see that 3 moles of CuO react with 1 mole of N2, which means that:
1 mole N2 = 3 moles CuO
So, if 3 moles of CuO produce 1 mole of N2, then 19 moles of CuO would produce:
1/3 x 19 = 6.33 moles of N2
However, we cannot have a fraction of a mole of a substance, so we need to round the answer to the nearest whole number:
To know more about moles visit:-
brainly.com/question/26416088
#SPJ1
Gamma rays have wavelengths of in the range of
meters.
a 10^12
b 10^-12
C 10^-20
d 10^20
what is produced when lactic acid fermentation occurs?
Lactic acid fermentation is a process by which glucose is converted into lactic acid. This occurs when glucose is broken down without the use of oxygen, and is used by cells to produce energy.
Lactic acid fermentation produces lactic acid and energy in the form of ATP. During this process, glucose is converted into pyruvate, which is then converted into lactate in the absence of oxygen. This process is carried out by certain bacteria, fungi, and animals, including humans.Lactic acid fermentation occurs when oxygen is not present, which means that the pyruvate produced during glycolysis cannot be converted into acetyl-CoA for the Krebs cycle.
As a result, the cell converts the pyruvate into lactic acid instead, which is a type of organic acid. Lactic acid fermentation is commonly used in the production of various foods, such as cheese, yogurt, and sauerkraut. It is also used in the production of alcoholic beverages like beer and wine. In addition, lactic acid fermentation is used in some industrial processes, such as the production of bioplastics and other materials.
Know more about Lactic acid fermentation here:
https://brainly.com/question/490148
#SPJ11
Top fuel dragsters and funny cars burn nitromethane as fuel according to the following
balanced combustion equation:
2CH3NO2 (1) + O2(g) → 2CO₂(g) + 3H₂O(1) + N2(g), Hrxn= -1418 kJ
The standard enthalpies of formation are -393.5 kJ/mol for CO2 (g) and -285.8
kJ/mol for H₂O(l)
Calculate the standard enthalpy of formation (Hf) for nitromethane.
-227.3 kJ/mol.
To calculate the standard enthalpy of formation (ΔHf) of nitromethane, we need to use Hess's Law, which states that the total enthalpy change during a chemical reaction is independent of the pathway between the initial and final states. In other words, if we can find a series of reactions whose enthalpy changes add up to the enthalpy change of the desired reaction, we can use them to calculate ΔHf.
First, let's write the combustion equation in terms of the standard enthalpies of formation:
ΔHrxn = ΣnΔHf(products) - ΣnΔHf(reactants)
where n is the stoichiometric coefficient of each compound in the balanced chemical equation.
Substituting the standard enthalpies of formation of CO2 and H2O into the equation, we get:
-1418 kJ/mol = 2ΔHf(CO2) + 3ΔHf(H2O) + ΔHf(N2) - 2ΔHf(CH3NO2)
(From these standard enthalpies given)
ΔHf(CO2) = -393.5 kJ/mol
ΔHf(H2O) = -285.8 kJ/mol
ΔHf(N2) = 0 kJ/mol
Now we need to solve for ΔHf(CH3NO2):
-1418 kJ/mol = 2(-393.5 kJ/mol) + 3(-285.8 kJ/mol) + 0 kJ/mol - 2ΔHf(CH3NO2)
ΔHf(CH3NO2) = [2(-393.5 kJ/mol) + 3(-285.8 kJ/mol) - 1418 kJ/mol]/2
= -227.3 kJ/mol
Therefore, the standard enthalpy of formation of nitromethane is -227.3 kJ/mol. This means that if one mole of nitromethane is formed from its elements in their standard states at a temperature of 25°C and a pressure of 1 atm, -227.3 kJ of heat will be absorbed by the system.
In simpler terms, the energy required to form one mole of nitromethane from its elements is -227.3 kJ/mol.
Nitromethane has a standard enthalpy of production of -490.2 kJ/mol.
Is nitromethane a more rapid combustion than gasoline?Nitromethane fuel may be used in one run 8.6 times more frequently than gasoline for a given cylinder volume. This indicates that using nitromethane instead of gasoline and the same amount of air results in around 2.3 times higher power.
We may get the standard enthalpy of production of nitromethane by using the values for the products and reactants' standard enthalpies of formation:
ΔHf° = Σ(nΔHf° products) - Σ(nΔHf° reactants)
ΔHf° for CO2(g) = -393.5 kJ/mol
ΔHf° for H2O(l) = -285.8 kJ/mol
ΔHf° for N2(g) = 0 kJ/mol
ΔHf° for O2(g) = 0 kJ/mol
The values in the formula above can be changed as follows:
ΔHf° for CH3NO2 = [2(-393.5 kJ/mol) + 3(-285.8 kJ/mol) + 1(0 kJ/mol)] - [2ΔHf° for CH3NO2 + 1(0 kJ/mol)]
If we simplify, we get:
ΔHf° for CH3NO2 = -1418 kJ/mol - 6(-285.8 kJ/mol) + 2(-393.5 kJ/mol)
ΔHf° for CH3NO2 = -1418 kJ/mol + 1714.8 kJ/mol - 787 kJ/mol
ΔHf° for CH3NO2 = -490.2 kJ/mol
To know more about Nitromethane visit:-
https://brainly.com/question/19578949
#SPJ1
A 1.350 mol gas sample has a volume of 3.51 L and a pressure of 0.925 atm. At what temperature was this gas collected?
The temperature of the gas sample was [tex]269 Kelvin (K).[/tex]
To solve this problem, we can use the ideal gas law:
[tex]PV = nRT[/tex]
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we need to rearrange the equation to solve for T:
[tex]T = PV/nR[/tex]
Now we can plug in the given values and solve for T:
[tex]T = (0.925 atm)(3.51 L)/(1.350 mol)(0.0821 L·atm/mol·K)T = 269 K[/tex]
Therefore, the temperature of the gas sample was [tex]269 Kelvin (K).[/tex]
To learn more about temperature please visit -
https://brainly.com/question/11464844
#SPJ1
why cannot pure bromine be used in free-radical reactions with alkenes? bromine is too slowly reactive. bromine is too selective. bromine adds to alkenes instead of substituting for hydrogen.
The correct answer is: "Bromine adds to alkenes instead of substituting for hydrogen."
In free-radical reactions with alkenes, a halogen such as bromine can be used as a halogenating agent to add a halogen atom to the alkene, producing a dihaloalkane. However, pure bromine cannot be used as a reagent in these reactions because it adds to the alkene rather than substituting for a hydrogen atom. This is because the bond between the two bromine atoms is relatively weak and can be broken easily, allowing bromine to add to the alkene to form a vicinal dibromide.
To overcome this problem, a source of bromine atoms that is less reactive and more selective is used in these reactions, such as N-bromosuccinimide (NBS) or a similar compound. NBS is a solid reagent that slowly releases small amounts of Br· radicals in solution. These radicals can react with alkenes to form vicinal dibromides, without adding to the alkene.
Learn more about free radicals on:
https://brainly.com/question/738531
#SPJ11
120 mg of codeine hydrochloride (codhcl) is dissolved in 10.0 ml of water. calculate the expected ph of the solution. the pkb and molar mass of codeine (cod) are 5.80 and 299.36 g/mol, respectively. 2. when 200.0 mg of zinc nitrate is dissolved in 100.0 ml of water, the solution ph is 5.75. calculate the pka of the zn(h2o)62 ion.
The codeine's pKa is 8.20
To calculate the expected pH of a solution of 120 mg of codeine hydrochloride in 10.0 ml of water, we first need to determine the concentration of codeine hydrochloride in the solution. We can do this by converting the mass of codeine hydrochloride to moles and dividing by the volume of the solution in liters:
moles of codhcl = 120 mg / (299.36 g/mol) = 0.000401 mol
concentration of codhcl = 0.000401 mol / 0.01 L = 0.0401 M
Next, we need to determine the pKa of codeine, which can be used to calculate the expected pH of the solution. The pKa of codeine is related to its pKb by the equation:
pKa + pKb = 14
Therefore, the pKa of codeine can be calculated as:
pKa = 14 - 5.80 = 8.20
Using this pKa value, we can calculate the expected pH of the solution using the Henderson-Hasselbalch equation:
pH = pKa + log([A⁻]/[HA])
where [A-] is the concentration of the codeine anion and [HA] is the concentration of the codeine acid (codeine hydrochloride).
The codeine anion is formed when codeine hydrochloride dissociates in water, so we need to determine the extent of dissociation. The dissociation constant (Ka) can be calculated from the pKa using the equation:
Ka = [tex]10^{-pKa}[/tex]
Ka = [tex]10^{-8.20}[/tex] = 6.31 x 10⁻⁹.
Therefore, the pKa of codeine hydrochloride is 8.20
To learn more about hydrochloride refer to:
brainly.com/question/14979040
#SPJ4
if the percent yield is 80.2%, what mass of k (in grams) is needed to obtain 27.6 g of h2? (assume in excess of hcl).
Stoichiometry and the idea of percent yield can be used to calculate the mass of K required to produce 27.6 g of H2. The reaction's balanced chemical equation is 2 K + 2 HCl 2 KCl + H2.
How much kclo3 is required to make 32.0 g of o2?Response and justification Hence, 126.23 g of potassium chlorate are needed to generate 32 g of oxygen.
How is yield determined in g?Divide the mass of the reactant by the molecular weight to get the mass per mole. As an alternative, we can multiply the liquid solution's density in grammes per millilitre by the amount of reactant solution in millilitres. Next, divide the outcome by the reactant's molar mass.
To know more about Stoichiometry visit:-
brainly.com/question/30215297
#SPJ1
what is the number of protons of an element with a mass number of 100 and a neutron number of 40?
Explanation:
There are few simple rules to follow.
(1) The atomic number is equal to the number of protons.
Z
= number of protons
(2) In neutrally charged elements, the number of electrons is the same as the number of protons.
Z
= number of protons = number of electrons (no charge)
Otherwise, positive charge means that the element lost an electron and negative charge means it gained an electron.
(3) The atomic mass is equal to the sum of the number of protons and number of neutrons.
A
= number of protons + number neutrons
or
A
=
Z
+ number neutrons
So if you say that
Z
= 20 and
A
= 40, then
A
=
Z
+ number neutrons
40 = 20 + number of neutrons
40 - 20 = number of neutrons
Therefore,
number of neutrons = 20
what do you observe when the iron is dipped in aluminum chloride solution
Answer:
Explanation:
When Iron is dipped in Aluminium Chloride, a redox reaction occurs. Basically iron reacts with Chloride ion and forms a solid precipitate of Aluminium.
End result :Iron (II) Chloride forms and Aluminium forms the precipitate
which of the following compounds will be least soluble in water? group of answer choices benzene (c6h6) acetic acid (ch3co2h) pentanol (ch3ch2ch2ch2ch2oh) ethyl methyl ketone (ch3ch2coh3) none of these compounds should be soluble in pentane.
None of these compounds are soluble in water. Benzene (C6H6) and ethyl methyl ketone (CH3CH2COCH3) are both non-polar and insoluble in water, while acetic acid (CH3CO2H) and pentanol (CH3CH2CH2CH2CH2OH) are both polar and soluble in water.
Non-polar molecules, such as benzene and ethyl methyl ketone, cannot interact with the polar water molecules, meaning that they do not dissolve in water. Polar molecules, like acetic acid and pentanol, can interact with water molecules due to their partial positive and negative charges.
This allows them to dissolve in water. Therefore, of the compounds given, benzene and ethyl methyl ketone are least soluble in water.
Know more about Polar molecules here
https://brainly.com/question/31023968#
#SPJ11
how to know what compound is most reactive towards a nucleophilic addition reaction
Compounds with electron-deficient carbon atoms, like carbonyl compounds, are generally more reactive towards nucleophilic addition reactions. Also, compounds with less steric hindrance around the electrophilic carbon atom show increased reactivity.
Nucleophilic addition reactions involve the addition of a nucleophile (such as an anion or a neutral molecule with a lone pair of electrons) to an electrophile, resulting in the formation of a new bond. The reactivity of a compound towards this type of reaction is determined by the electronic and steric properties of the electrophilic carbon atom.
Compounds with electron-deficient carbon atoms, such as carbonyl compounds (e.g. aldehydes, ketones, and carboxylic acids), have a partially positive carbon atom that is highly susceptible to attack by a nucleophile. This is due to the polarity of the C=O bond, which creates a dipole that makes the carbon atom electron-deficient. Therefore, these compounds are generally more reactive towards nucleophilic addition reactions.
Additionally, steric hindrance around the electrophilic carbon atom can also affect its reactivity towards nucleophilic addition reactions. Compounds with bulky substituents around the electrophilic carbon atom may have hindered access to the carbon atom by nucleophiles, reducing the reaction rate. Conversely, compounds with less steric hindrance around the electrophilic carbon atom will be more reactive towards nucleophilic addition reactions.
To know more about nucleophilic addition, refer here:
https://brainly.com/question/29561357#
#SPJ11
The table shows the concentration of a reactant in the reaction mixture over a period of time.
What is the average rate of the reaction over the first 450 seconds?
A. 1.7 × 10−3
B. 1.9 × 10−3
C. 2.0 × 10−3
D. 2.2 × 10−3
Answer:
D
Explanation:
it is 2.2 ×10-3 because the avarage is between 2 and 3
Calculate the mass of copper if 3807.4 J of copper is cooled from 155 oC to 23 oC.
The specific heat of copper is 0.385 J/g*oC.
Answer:
Explanation:
It takes 487.5 J to heat 25 grams of copper from 25 °C to 75 °C. What is the specific heat in Joules/g·°C? Answer: The specific heat of copper is 0.39 J/g·°C
how was rutherfords gold foil experiment inconsistent with the plum pudding model of the atom
In Rutherford's gold foil experiment, alpha particles were fired against a thin sheet of gold foil, and their scattering patterns were then recorded on a screen.
What aspect of the plum custard model of the atom was contradicted by Rutherford's gold foil experiment?In Thomson's "plum custard" atom model, a positively charged "soup" was surrounded by negatively charged electrons. Rutherford's gold foil experiment proved that an atom is mostly empty space with a tiny, dense, positively-charged nucleus.
Why was the plum custard model not supported by Rutherford's experiment?Because of Rutherford's discoveries, Thomson's plum pudding model was flawed. An atom's positive charge is not distributed uniformly. Instead, everything is gathered in the tiny nucleus. Except for the electrons that are dispersed across it, the remaining space in an atom is empty.
To know more about electrons visit:-
https://brainly.com/question/28977387
#SPJ1
What is the percent yeild of an Fe-Containing product if the 2. 9 grams is isolated from the reaction of 24. 1 g Ca3(PO4)2 and 15. 2 g Fe(NO3)2
The substance that contains iron has a yield of 30.7%.
To determine the percent yield of an Fe-containing product, we first need to determine the theoretical yield. This is the maximum amount of product that can be obtained based on the balanced chemical equation and the amount of reactants used.
The balanced chemical equation for the reaction between Ca₃(PO₄)₂ and Fe(NO₃)₂ is:
3Ca₃(PO₄)₂ + 10Fe(NO₃)₂ → 2Fe₃(PO₄)₂ + 30Ca(NO₃)₂
Using the given masses, we can determine the limiting reactant and then calculate the theoretical yield of Fe₃(PO₄)₂
First, we need to convert the masses of Ca₃(PO₄)₂ and Fe(NO₃)₂ to moles:
24.1 gCa₃(PO₄)₂ × (1 mol Ca₃(PO₄)₂/310.18 g) = 0.0778 mol Ca₃(PO₄)₂
15.2 gFe(NO₃)₂ × (1 mol Fe(NO₃)₂/179.86 g) = 0.0845 mol Fe(NO₃)₂
The stoichiometric ratio betweenCa₃(PO₄)₂ and Fe(NO₃)₂ is 3:10, so the amount of Fe(NO₃)₂used is limiting. Therefore, the theoretical yield of Fe₃(PO₄)₂ is:
0.0845 mol Fe(NO₃)₂ × (2 mol Fe₃(PO₄)₂/10 mol Fe(NO₃)₂) × (559.68 g Fe₃(PO₄)₂/1 mol Fe₃(PO₄)₂) = 9.43 g Fe₃(PO₄)₂
Now, to calculate the percent yield, we divide the actual yield (2.9 g) by the theoretical yield (9.43 g) and multiply by 100:
Percent yield = (2.9 g/9.43 g) × 100 = 30.7%
Therefore, the percent yield of the Fe-containing product is 30.7%. This indicates that the reaction did not proceed to completion, and some Fe3(PO4)2 was left unreacted or lost during the isolation process.
To learn more about reaction refer to:
brainly.com/question/30564957
#SPJ4
1.275 X 10^25 molecules of O₂ to grams
From the calculations, we can see that the number of moles of the oxygen molecules that is present is 21.2 moles.
What is the number of moles?The moles refers to the n umber of the elementary entities that we have in the substances and in this case we are dealing with the number of moles that we have in the oxygen molecule here.
We know that;
1 mole of O2 contains 6.02 * 10^23 molecules
x moles of the O2 contains 1.275 X 10^25 molecules of O₂
x = 21.2 moles
Thus what we have is about 21.2 moles of oxygen
Learn more about moles:https://brainly.com/question/26416088
#SPJ1
A chemist adds 55.423 grams of copper(II) sulfate to a 250.0-mL volumetric flask and adds water up to the line. What is the molarity of this solution?
The molarity of this solution is 1.39 M.
What do molarity and normalcy mean?Molarity, on the other hand, refers to the content of a substance or ion in a solution, whereas normality only refers to the molar concentration of the solution's acid or base components.
The formula is as follows:
Molarity (M) = moles of solute/liters of solution
We must first locate the copper(II) sulphate molecules. By splitting the solute's mass by its molar mass, we can determine this.
The molar mass of copper(II) sulfate is:
63.55 g/mol (for copper) + 2(32.06 g/mol) (for sulfur) + 4(16.00 g/mol) (for oxygen) = 159.61 g/mol
So, moles of copper(II) sulfate = 55.423 g / 159.61 g/mol = 0.347 moles
The volume of solution is 250.0 mL=0.250 L
Use the formula to calculate the molarity:
Molarity=0.347 moles / 0.250 L
= 1.39 M.
To know more about molarity visit:-
https://brainly.com/question/2817451
#SPJ1
edta is a hexadentate ligand containing four carboxylic acid groups and two amines. which statements regarding the acid-base properties of edta are true?
The acid-base properties of EDTA (ethylenediaminetetraacetic acid) can be described as follows:
EDTA is a weak acid and can donate four protons (H⁺) from its four carboxylic acid groups. The pKa values of these acidic protons are between 1.5 and 2.0.
EDTA also has two amine groups, which can act as weak bases and accept protons (H⁺) under appropriate conditions. The pKa values of these basic groups are around 10.5.
In the presence of metal ions, EDTA can form stable coordination complexes due to its ability to chelate these metal ions with its six donor atoms (four oxygen atoms and two nitrogen atoms).
The formation of these EDTA-metal complexes is favored at higher pH values, where the EDTA molecule is deprotonated and has a higher negative charge, thus increasing its affinity for positively charged metal ions.
The acid-base properties of EDTA make it a useful chelating agent in a variety of applications, such as in analytical chemistry, industrial processes, and medicine.
To learn more about carboxylic acid refer to:
brainly.com/question/29035899
#SPJ4
Moles for N2(g) + H2(g) NH3(g)
a compound consists of 25.9% nitrogen and 74.1% oxygen by mass. what is the empirical formula of the compound?
Using a 100 g sample of a compound with 25.9% nitrogen and 74.1% oxygen, we determine the empirical formula to be N₂O₅.
To determine the empirical formula of a compound, we need to find the ratio of the number of atoms of each element in the compound, in its simplest whole-number ratio. Here's how we can do it:
Assume we have a 100 g sample of the compound. Then, 25.9 g of it is nitrogen and 74.1 g is oxygen.
Convert the mass of each element to moles, using their respective molar masses:
Nitrogen: 25.9 g / 14.01 g/mol = 1.85 mol
Oxygen: 74.1 g / 16.00 g/mol = 4.63 mol
Find the ratio of the moles of each element by dividing both values by the smallest one:
Nitrogen: 1.85 mol / 1.85 mol = 1
Oxygen: 4.63 mol / 1.85 mol = 2.50
If necessary, adjust the ratio to the nearest whole number. Since we can't have half an atom, we need to multiply both values by 2:
Nitrogen: 1 x 2 = 2
Oxygen: 2.50 x 2 = 5
The empirical formula of the compound is therefore N₂O₅.
Therefore, the empirical formula of the compound is N₂O₅.
Learn more about empirical formula here: brainly.com/question/14044066
#SPJ4
Sodium carbonate and calcium chloride are mixed, which of the following
correctly describes the outcome?
a. No reaction is seen
b. A precipitate of calcium carbonate forms
c. A precipitate of sodium chloride forms
d. A precipitate of sodium and calcium is seen.
When sodium carbonate and calcium chloride are mixed, a precipitate of calcium carbonate forms.
Option B is correct.
What is a chemical reaction?
A chemical reaction is described as a process that leads to the chemical transformation of one set of chemical substances to another.
The reaction between sodium carbonate (Na2CO3) and calcium chloride (CaCl2) is a double displacement reaction, which is shown by the following chemical equation:
Na2CO3 + CaCl2 → CaCO3 + 2NaCl
We can see that the carbonate ion (CO32-) from sodium carbonate combines with the calcium ion (Ca2+) from calcium chloride to form solid calcium carbonate (CaCO3), which is insoluble in water and appears as a precipitate.
Learn more about a double displacement reaction, at: https://brainly.com/question/23918356
#SPJ1
What evidence supports the claim that social mediahad more of an influence outside of the Arab world thaninside it?a. Sixty five percent of Egyptians do not use theinternet at allb. Eighty four percent of internet users visit socialnetworking sites for political news,c. College educated people are more likely to use the internetd. Social media sites use bitly links to help spreadinformation
The evidence that supports the claim that social media had more of an influence outside of the Arab world than inside it is Eighty four percent of internet users visit social networking sites for political news. Option B is correct.
This statistic suggests that social networking sites have a significant influence on the dissemination of political news and information, and it implies that individuals who use the internet are more likely to consume political news through social media than through traditional media sources.
However, option (a) is also relevant because it suggests that internet penetration is lower in the Arab world, which could limit the impact of social media in the region compared to other parts of the world. Option (c) is not directly related to the claim, while option (d) is only tangentially related to the spread of information, rather than the influence of social media on society.
Hence, B. Eighty four percent of internet users visit social networking sites for political news is the correct option.
To know more about social networking here
https://brainly.com/question/29708102
#SPJ4