A tiny amount of weak hydrochloric acid is mixed with a quantity of marble chips (CaCO3), to decrease the rate of reaction we do decreasing the surface area of the marble chips, decreasing conc. HCL and many more.
Several ways are:-
1. Decreasing the surface area of the marble chips: By breaking the marble chips into smaller pieces, the surface area that is available for the acid to react with is reduced, slowing down the reaction.
2. Decreasing the concentration of the hydrochloric acid: By using a less concentrated solution of hydrochloric acid, the number of acid molecules available to react with the marble chips is reduced, slowing down the reaction.
3. Increasing the temperature: By performing the reaction at a lower temperature, the kinetic energy of the acid and marble chip molecules is reduced, slowing down the rate of collision between them, which slows down the reaction.
4. Using a catalyst: Addition of a catalyst to the reaction can change the reaction mechanism and decrease the activation energy needed for the reaction to occur, thus slowing down the reaction.
5. Using an inhibitor: An inhibitor is a substance that slows down the reaction by binding to the enzyme or catalytic site and preventing the substrate from binding.
It's important to note that these methods may also affect the overall yield of the reaction, so it's essential to use the appropriate method(s) for the specific experiment and goals.
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The picture below shows an open field with wildflowers.
Which of the following is NOT a way that this environment supports populations of bees?
It gives the bees a place to rest
It allows easy pollination for flower reproduction
It provides flowers with nectar
It gives the bees minerals in the soil that they eat
I'll pick brainliest for the one who gets it right :)
Answer:
I think it's B
Explanation:
B is talking about the bees helping the flowers, so that isn't helping the bees but the flowers instead
A solution of water and sugar contains 12g of sugar and 400 mL of water.
What is the concentration of this solution?*
Answer:
500ml
Explanation:
because 100 ×2 is 200 and the 300
500ml
a word used to describe if one substance can be dissolved in another
1. aqueous
2. solvent
3. solution
4. concentration
5. solute
6. soluble
7. cohesion
8. solvation
9. polarity
10. dilution
11. adhesion
12. solubility
Answer:
Soluble
Salt is soulble is water
Explanation:
Solubility although similar just means how easily it will disolve somthing that isnt soluble in one thing still has solubility
At rest, a person inhales 2.31 x 1023 nitrogen molecules in an average breath of air. How many moles of nitrogen atoms are inhaled
0.384 moles of nitrogen atoms are inhales by the person in an average breath of air.
Avogadro constant is the number of molecules present in 1 mole of gas or a chemical compound. It is used to specify the atomic mass of a certain number of molecules in a substance or chemical compound or gas, in grams. Theses molecules may be atoms, neutron, proton, electron, etc. One mole of a substance contains 6.023 × 10²³ Molecules. In other words the atomic mass of a substance is the weight of 6.023 × 10²³ molecules.
So 2.31 × 10²³ atoms of nitrogen = (2.31 × 10²³)/(6.023 × 10²³)
= 0.384 moles
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Consider the following intermediate chemical equations. 3 equations. 1: upper C solid plus upper o subscript 2 gas right arrow upper C upper O subscript 2 gas Delta H 1 equals negative 393.5 kilojoules. 2: 2 upper C upper O gas plus upper O subscript 2 gas right arrow 2 upper C upper O subscript 2 gas Delta H 2 equals negative 566.0 kilojoules. 3: 2 upper H subscript 2 upper o gas right arrow 2 upper H subscript 2 gas plus upper O subscript 2 gas delta H 3 equals 483.6 kilojoules. The overall chemical equation is Upper C (s) plus upper H subscript 2 upper O (g) right arrow upper C upper o (g) plus upper H subscript 2 (g).. To calculate the final enthalpy of the overall chemical equation, which step must occur?
The final enthalpy of the overall chemical equation is -475.9KJ. and 2nd step must occur to calculate the final enthalpy.
what is enthalpy?Enthalpy depends only on the system's composition, temperature, and pressure; it is unaffected by the system's history. It is a quality or state function that resembles energy and has energy-like properties (and is thus measured in units of joules or ergs).
1st equation
C(s) + O₂ → CO₂ ΔH₁ = - 393.5KJ
2nd equation
CO + O₂ → 2CO₂ ΔH₂ = -566.0KJ
3rd equation
2H₂O → 2H₂ + O₂ ΔH₃ = 483.6KJ
Overall chemical equation is
C(s) + H₂ + O→ CO(g) + H₂(g)
The overall chemical equation's final enthalpy is
ΔH = ΔH₁ + ΔH₂ + ΔH₃
ΔH = - 393.5 -566.0 + 483.6
ΔH = -959.5 + 475.9
ΔH = -475.9KJ.
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How many oxygen atoms are in 2.50 L of oxygen?
Answer:
There are 8.30x104-24 atoms of oxygen in 2.50 mol of oxygen gas. There are 7.53x10*23 atoms of oxygen in 2.50 mol of oxygen gas.
write the reaction equation for the reversible chemical reaction that occurs when the indicator bromcresol
Reactions that are reversible have the ability to move both forward and backward. Reactants change into products in a reversible reaction, but products can also change back into reactants.
In actuality, the opposing reaction as well as the forward reaction will occur simultaneously. In some chemical reactions, the reaction's products might combine to form the reactants' original form. Reversible reactions are what they are referred to as. To illustrate them, use the formula: A + B C + D. Only in one direction can irreversible chemical reactions take place. Reactants can transform into products, while products cannot transform back into reactants. Chemical reactions that can be reversed can happen both ways. The products can change back into the reactants, and the reactants can change back into the products.
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Methanol (methyl alcohol or wood alcohol) is a potential automotive fuel, either in pure form or mixed with gasoline. Some fleet vehicles, such as municipal buses, have been modified to burn methanol-containing fuels. These fuels are also used by some race cars. A particular automobile modified to use a mixture of 85.0% methanol and 15.0% gasoline by mass gets 25.5 mi/gal. The fuel has a density of 0.775 g/mL. How many kilograms of methanol does the automobile consume in a trip of 808 km
Answer:
it’s 4
Explanation:
How many grams are in 2.5 moles of KCl
Answer:
186.25
Explanation:
KCL= 74.5 (molar mass)
2.5*74.5= 186.25
What is the most common irony?
In literary classes, the three most popular types are verbal irony, dramatic irony, and situational irony. When a speaker or narrator says something that contradicts what they mean, what they intend, or what the context necessitates, this is called verbal irony.
What is irony?One thing is expressed while another is meant in an ironic statement. For example, on a chilly, wet gray day, you would exclaim, "What a gorgeous day!" Alternatively, if you were suffering from a severe case of food sickness, you may respond, "Wow, I feel terrific today." "ffers points of view and ideas that are, at most, intriguing... However, it does not reach the truth." Ronagh and Souder are particularly concerned with scientific assertions that are not meant to be taken seriously.
Here,
The three most common varieties in literary studies are verbal irony, dramatic irony, and situational irony. Verbal irony occurs when a speaker or narrator says something that contradicts what they mean, what they intend, or what the context requires.
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Sample Response: Even though a compound can be made of two or more types of atoms, it is still a pure substance because the compound can be isolated, like salt or water. What did you include in your response? Check all that apply. a. A compound can be a pure substance. b. A compound can be isolated.
Answer:
a. A compound can be a pure substance.
b. A compound can be isolated.
Explanation:
a. A compound can be a pure substance.
This is because a compound which is made up of two or more atoms is also a pure substance since, a pure substance is a substance that contains only one type of matter - that is, it is in a single phase of matter.
Examples of compounds include water (H₂O) and ammonia (NH₃)
b. A compound can be isolated.
This is because, since it is a pure substance, it has unique properties which distinguish it from other compounds.
Solid silicon and solid magnesium chloride form when silicon tetrachloride gas reacts with magnesium metal. Write a word equation and an unbalanced formula equation including physical states.
Solid silicon and solid magnesium chloride form when silicon tetrachloride gas reacts with magnesium metal. the equation is :
SiCl₄(g) + Mg(s) ---> Si(s) + MgCl₂(s)
When the solid silicon react with the solid magnesium chloride , the word equation is :SiCl₄(g) + Mg(s)
the product formed is the silicon tetrachloride gas. the word equation is :
Si(s) + MgCl₂(s)
The unbalanced equation is :
SiCl₄(g) + Mg(s) ---> Si(s) + MgCl₂(s)
The balanced equation for the reaction of the silicon tetra chloride react with the magnesium and form the silicon and the solid magnesium chloride. and t is given :
SiCl₄(g) + Mg(s) ---> Si(s) + MgCl₂(s)
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What is the identify of an element with 14 protons 14 neutrons and 14 electrons?
The element with 14 protons 14 neutrons and 14 electrons is Silicon
Protons and neutrons can both be found in the nucleus of an atom of any chemical element. These subatomic particles add up to give the atom's atomic mass. The characteristic that distinguishes isotopes of different elements from one another is their atomic mass.
Z, the atomic number, is 14 if there are 14 protons. Z being the quantity of large positively charged nuclear particles by definition. And Z establishes the atom's identity; if Z = 14,we can find on periodic table element that have atomic number 14 is silicon,
Therefore element with 14 protons 14 neutrons and 14 electrons is Silicon
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10. A body is found at 2:00 pm on New Year's Eve. The temperature of the liver registers 75. 5° F. What is the approximate TOD of the victim?
The estimated time of death is approximately 10:30 pm the night before.
Estimating the time of death (TOD) can be a complex process, and the methods used will depend on the specific circumstances of the case. Some of the factors that may be taken into consideration include:
The stage of decomposition of the body: As a body decomposes, it will go through several distinct stages, each of which can provide information about the TOD.The temperature of the body: As a body cools after death, the temperature will drop at a predictable rate. By measuring the temperature of the body at different points in time, it may be possible to estimate the TOD.The body's position: The position of the body can provide clues about the time that has passed since death. For example, if a body is found lying on its back, it may indicate that it has been dead for a longer period of time than if it is found on its stomach.The presence of insects or animals: Certain insects and animals are attracted to dead bodies at different stages of decomposition. By examining the presence of these insects or animals, it may be possible to estimate the TOD.Scene examination: The scene examination and any possible evidence collected can give a rough estimate of the time of death.It is important to note that estimating the TOD is not an exact science and there are often significant margins of error. A professional forensic examination is typically needed to determine the TOD.
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9.0 mol al reacts with 6.0 mol O2 to form Al2O3. According to the reaction below: 4Al+3O2=2Al2O3. How many moles of Al2O3 form from 6.0 mol al?
The number of moles of the aluminum oxide that is produced is 4.5 moles.
What is the stoichiometry?We have to look at the stoichiometry of the reaction. In this case, we can see that there is a combination between the aluminum and the oxygen and then we have a product as have been shown in the equation that we have in the question.
From the equation, we know that;
4 moles of oxygen produces 2 moles of aluminum oxide
9 moles of oxygen produces x moles of aluminum oxide
x = 9 * 2/4
x = 4.5 moles
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Answer: its actually 4
Explanation:
A gas has an initial pressure of 120 kPa, a volume of 23 liters, and a temperature of 20°C. If the pressure is raised to 150 kPa the new volume is 17 liters, what is the new temperature of the gas? 0 0.003 K 0 270.7 K O 18.4K O 100 K
Answer:
virgil Cassidy n.v
Christian doctorbbn nnn
Explanation:
Verizon mlm
A
Choose the correct symbol to
compare these numbers.
-4 [?] 0.589
A. <
B. >
C. =
Hello there!
Answer:
A. <
Explanation:
You should remember that all negative numbers are smaller then positive numbers. For example, -10 < 7 or -9479 < 1
-4 is a negative integer
0.598 is a positive number
So -4 < 0.598 (negative < positive)
The empirical formula for the compound having the formula H₂C₂O4 is
C₂O₂H₂
COH
COH ₂
CO₂H
C₂H₂
Answer:
CO₂H
Explanation:
The empirical formula gives the smallest whole number ratio of atoms of each element in a compound.
The ratio of hydrogen, carbon and oxygen in H₂C₂O₄ is:
H : C : O
2 : 2 : 4
They have a common factor of 2, so we can divide the atoms of each element by 2:
H : C : O
1 : 1 : 2
This gives us HCO₂ or CO₂H
If the mass of the products (AlCl3 and Cu) are 146g total and the mass of CuCl2 on the reactant side is 126 grams, what is the mass of Al
Your limiting reagent will be copper (II) chloride. The mole ratio is the most crucial tool you'll have to tackle this problem, or any other stoichiometry problem, for that matter.
Keep in mind that in order to make 3 moles of copper from 3 moles of copper (II) chloride, you need 2 moles of aluminum. Unbalanced reaction: Al(s)+HCl(aq) AlCl3(aq)+H2(g). Cl. Balance On the product side there are three Cl atoms and on the reactant side there is one. There is only one hydrogen atom on the reactant side and two on the product side of the reaction Mg + HCl MgCl 2 + H 2. The equation is therefore unbalanced.
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Iron undergoes a synthesis reaction to form Iron (III) Oxide when it is heated in air.
Write the balanced chemical equation for this reaction. [2]
4 Fe(s) + 3 02(g) - 2 Fez03(s)
(Complete)
What amount of iron reacts with 15 mol of oxygen? [3]
What amount of iron (III) oxide is produced? [3]
If 4.60 g of iron (III) oxide is produced, what mass of iron is reacted? [3]
Ferric oxide, is the product that is formed when iron undergoes oxidation
What is the Reaction?Upon reacting with oxygen, iron will be oxidized to either the +3 oxidation state in iron (III) oxide, or to a combination of the +2 and +3 oxidation states in iron (II, III) oxide.The balanced chemical equations for these reactions look like this
#4”Fe”_text((s]) + 3”O”_text(2(g]) -> 2”Fe”””_2”O”_text(3(s])#
And
#3”Fe”_text((s]) + 2”O”_text(2(g]) -> “Fe”””_3”O”_text(4(s])#
The first compound, iron (III) oxide, also called ferric oxide, is dark red/brown in color
While the second compound, iron (II, III) oxide, also called ferrous ferric oxide, is dark brown/black in color.The [Fe(H2O)6]3+ ion is colorless (or pale pink), but many solutions containing this ion are yellow or amber-colored because of hydrolysis.
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PLSSSSS HELP I DONT GET THIS PROBLEMMMM
...Using the above data table and graph, calculate the total energy in Joules required to raise the temperature of 15.0g of ice at -5.00ºC to steam at 35.0ºC
a) 7730 J
b) 7740 J
c) 7370 J
d) 7340 J
Answer:
C. 7370 joules.
Explanation:
There is a mistake in the statement. Correct form is described below:
Using the above data table and graph, calculate the total energy in Joules required to raise the temperature of 15 grams of ice at -5.00 °C to water at 35 °C.
The total energy needed to raise the temperature is the combination of latent and sensible heats, all measured in joules, and represented by the following model:
[tex]Q = m\cdot [c_{i} \cdot (T_{2}-T_{1})+L_{f} + c_{w}\cdot (T_{3}-T_{2})][/tex] (1)
Where:
[tex]m[/tex] - Mass of the sample, in grams.
[tex]c_{i}[/tex] - Specific heat of ice, in joules per gram-degree Celsius.
[tex]c_{w}[/tex] - Specific heat of water, in joules per gram-degree Celsius.
[tex]L_{f}[/tex] - Latent heat of fusion, in joules per gram.
[tex]T_{1}[/tex] - Initial temperature of the sample, in degrees Celsius.
[tex]T_{2}[/tex] - Melting point of water, in degrees Celsius.
[tex]T_{3}[/tex] - Final temperature of water, in degrees Celsius.
[tex]Q[/tex] - Total energy, in joules.
If we know that [tex]m = 15\,g[/tex], [tex]c_{i} = 2.06\,\frac{J}{g\cdot ^{\circ}C}[/tex], [tex]c_{w} = 4.184\,\frac{J}{g\cdot ^{\circ}C}[/tex], [tex]L_{f} = 334.72\,\frac{J}{g}[/tex], [tex]T_{1} = -5\,^{\circ}C[/tex], [tex]T_{2} = 0\,^{\circ}C[/tex] and [tex]T_{3} = 35\,^{\circ}C[/tex], then the final energy to raise the temperature of the sample is:
[tex]Q = (15\,g)\cdot \left[\left(2.06\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (5\,^{\circ}C)+ 334.72\,\frac{J}{g} + \left(4.184\,\frac{J}{g\cdot ^{\circ}C}\right)\cdot (35\,^{\circ}C) \right][/tex]
[tex]Q = 7371.9\,J[/tex]
Hence, the correct answer is C.
someone help asap it is due in 5 minutes
Answer:
Kingdom
Explanation:
Out of all the choices, Kingdom is the most inclusive and least specific.
When the question asks for the most inclusive and least specific group, it is asking for the most broad group.
Also, you can just look at the left of the image. It basically shows you the answer.
When nitroglycerin (C3H50N309) is detonated, the carbon and hydrogen atoms bonded to oxygen
and nitrogen separate and heat is released. What type of energy is stored in the bonds?
a. Chemical potential energy
b. Thermal potential energy
c. Chemical kinetic energy
d. Thermal kinetic energy
Answer:
d thermal kinetic energy
When nitroglycerin (C3H50N309) is detonated, the carbon and hydrogen atoms bonded to oxygen and nitrogen. The type of energy is thermal kinetic energy.
What is Thermal kinetic energy?Thermal energy is the total of potential energy and kinetic energy. Kinetic energy is the energy used in doing a work.
Thermal energy is the form of heat, it can be both potential and kinetic. In the reaction, the heat is releasing, so it's a thermal kinetic energy.
Thus, the correct option is d. Thermal kinetic energy.
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the ka for hydrofluric acid is 7.2 x 10-4. this means that hf is
a weak acid. The Ka (acid dissociation constant) is a measure of the strength of an hydrofluoric acid in solution. It is defined as the equilibrium constant for the dissociation reaction of the acid in water,.
which is usually written as:
HA + H2O → H3O+ + A-
A lower Ka value indicates that the acid is a weak acid, meaning that it does not dissociate very well in water and thus has a low concentration of H3O+ ions. A higher Ka value indicates that the hydrofluoric acid is a strong acid, meaning that it dissociates very well in water and thus has a high concentration of H3O+ ions. Given that the Ka for hydrofluoric acid is 7.2 x 10-4, this means that hydrofluoric acid is a weak acid. This means that it does not dissociate very well in water and thus has a low concentration of H3O+ ions. It is a weaker acid than the strong acids like Hydrochloric acid, Sulfuric acid, Nitric acid and many others.
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A balloon of hydrogen is subjected to vacuum. The initial pressure and volume of hydrogen is 0. 95 atm and 0. 55 L. Calculate the final pressure if the final volume is 1. 22 L?
The final pressure if the final volume is 1. 22 L will be 0.4234 atm
To calculate the final pressure of the hydrogen in the balloon if the final volume is 1.22 L, the ideal gas law can be used. The ideal gas law states that PV = NRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
Since the number of moles and the temperature is not given, we can assume that they remain constant. So we can use the equation PV = k, where k is a constant.
Given the initial pressure and volume of the hydrogen are 0.95 atm and 0.55 L respectively.
0.95*0.55 = k
so k = 0.5175
then the final pressure can be calculated by:
P1V1 = P2V2
0.950.55 = P21.22
P2 = (0.5175) / (1.22) = 0.4234 atm
The final pressure of the hydrogen in the balloon will be 0.4234 atm.
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Is 1g equal to 1 mol?
Volumetric flask - __________ during mixing and storage. Fill in the blank
When mixing and storing materials, volumetric flasks are utilized to determine volumes.
Volumetric flasks: what are they?A volumetric flask is a piece of plastic or glass lab equipment used to make solutions. It is applied to prepare a solution with a specific volume. Compared to beakers or Erlenmeyer flasks, volumetric flasks can be used to measure volumes significantly more precisely.
When is the best time to utilize a volumetric flask?When it's important to know the volume of the mixture being made exactly and properly, a volumetric flask is utilized. Similar to volumetric pipets, the size of a volumetric flask varies according to the solution volume that is being made.
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Diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are molecules composed of two atoms of the same element covalently bonded together, as opposed to other elements which are composed of only one atom.
What is diatomic?Diatomic elements are those elements that exist in nature as molecules made up of two atoms. Examples of diatomic elements include oxygen (O2), hydrogen (H2), nitrogen (N2), fluorine (F2), chlorine (Cl2), and iodine (I2). These elements are the only elements that exist naturally as diatomic molecules.
This gives diatomic elements distinct properties compared to other elemental substances, such as having two different electron configurations, and having different spin states. Diatomic elements also have properties that are unique to them, such as having different boiling points, higher densities, and different reactivity. Additionally, diatomic elements are essential for life as many are used in crucial biochemical processes.
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Record your evidence about the Moon's appearance
changing because the position of the Moon changes.
Help please…
Answer:
A solar eclipse .
It is one that occurs when the moon gets between the Earth and the Sun and it casts its shadow over the Earth. A solar eclipse only happens during the phase of new moon when the moon is indirect blockage of sun rays from reaching the earth thus causing a full shadow of the moon to fall on the Earth’s surface.
2 A lunar eclipse can only occur when there is a full moon. An eclipse of the moon happens only at full moon and only when the moon passes through some portion of the Earth’s shadow. The shadow in made of a two cone-shaped components, one which is nested inside the other.
3. Earth blocks sunlight from reaching the moon's surface. There are three categories of lunar eclipse according to the blockage of the sun rays. In a penumbral lunar eclipse, the moon passes through Earth’s penumbral shadow. The partial lunar eclipse occurs when a portion of the moon passes through Earth’s umbral shadow. The total lunar eclipse happens when the entire moon passes through Earth’s umbral shadow.
4.When an object in space comes between the sun and earth. It is one that occurs when the moon gets between the Earth and the Sun and it casts its shadow over the Earth. A solar eclipse only happens during the phase of new moon when the moon is indirect blockage of sun rays from reaching the earth thus causing a full shadow of the moon to fall on the Earth’s surface.
5.A total lunar eclipse. In this type of lunar eclipse, the events are clearly visible and striking to view because the Moon surface appear red in color. During the occurrence of the lunar eclipse events, 35% of the entire eclipse is total eclipse.
6. Wide, dark areas and strange spots and ridges –Galileo described the surface of the moon as being uneven and rough. In addition to that, he described the surface as crowded with depressions and bulges. In his original sketches, the long shadows cast by craters were represented by dark sided of the moon sketch.
7. Waxing gibbous .During the cycle of the moon, it undergoes several phases; new moon-new crescent-first quarter-waxing gibbous-full moon-waning gibbous-last quarter-old crescent-new moon. The new moon phase cannot be seen because the part receiving sun rays in then pointed away from the earth. The rest of the phases are visible from the earth.
8. New moon .
During the cycle of the moon, it undergoes several phases; new moon-new crescent-first quarter-waxing gibbous-full moon-waning gibbous-last quarter-old crescent-new moon. The new moon phase cannot be seen because the part receiving sun rays in then pointed away from the earth. The rest of the phases are visible from the earth.
9. Because the Southern Hemisphere has more direct sunlight .During the winter months, the Northern Hemisphere is tilted away from the sun, thus it receive sunrays at an angle thus it experiences the cold weather. At this period, it is summer in the Southern Hemisphere.
Explanation:
The moon is the earth's closed satellite and it gets light from the sun. The moon has several phases that are seen within 27 days cycle.
There are 6-7 phases of the moon that is the new moon, the first quarter, the full moon, secondary phases like the waning and waxing crescent, the waxing and waning gibbous. The new moon starts with the moon coming in between the sun and the earth. Then comes the waning crescent phase between the new moon and the quarter. The first quarter is a half-moon, 90 degrees east of the sun. The waxing gibbous is between the first quarter and full moon. The full is when sun illumination is 100% and again waning gibbous descends back to last quarter or the 3rd quarter.Hence as the earth changes its position the moon also revolves in a similar manner.
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what is the mole fraction of ethanol c2h5oh in an aqueous solution in which the ethanol concentration is 4.6 molal
The mole fraction of ethanol, C2H5OH is 0.076 that can be calculated by using the density of water.
The mole fraction of any solution is described because the ratio of the quantity of moles of that is present withinside the technique to the entire quantity of moles of all of the additives of the solution. Molarity on the other hand is the ratio of moles to the volume.
Molecular mass of ethanol = 46g
The molarity of the solution is 4.6 molal=4 moles in 1L solution
Molecular mass of water =18g
Density of water = 1kg/m3 = 1000g/L
So, mass of water in 1 l solution = 1000g
So moles = 1000/18 = 55.55 moles
Thus, mole fraction of ethanol= 4.6/(4.6+55.6) =0.076
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