Answer:
Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.
Explanation:
can you please help me with the most recent question i just posted? its for 100 points, im stuck on it and its due soon!
Calculate the expected vapor pressure (in atm) for a solution prepared by dissolving 183. 0 g fructose in 500. 0 ml of water. Fructose is a nondissociating molecule, with a molar mass
The expected vapor pressure of the solution prepared by dissolving 183.0 g of fructose in 500.0 mL of water is approximately 0.0301 atm.
The mole fraction of water in the solution can be calculated as follows:
Moles of water = (volume of water in liters) x (density of water) / (molar mass of water)
Moles of water = (500.0 mL / 1000.0 mL/L) x (0.9982 g/mL) / (18.015 g/mol)
Moles of water = 27.722 mol
Moles of fructose = (mass of fructose) / (molar mass of fructose)
Moles of fructose = 183.0 g / 180.16 g/mol
Moles of fructose = 1.016 mol
The total moles of solute and solvent in the solution are:
Total moles = moles of water + moles of fructose
Total moles = 27.722 mol + 1.016 mol
Total moles = 28.738 mol
The mole fraction of water in the solution is:
Mole fraction of water = moles of water / total moles
Mole fraction of water = 27.722 mol / 28.738 mol
Mole fraction of water = 0.962
Using Raoult's Law, the expected vapor pressure of the solution can be calculated as:
Vapor pressure = mole fraction of water x vapor pressure of pure water
Vapor pressure = 0.962 x 0.0313 atm
Vapor pressure = 0.0301 atm
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One mole is a quantity unit that is always equal to __________________________.
Answer:
6.022 × 10²³ units of that substance
Explanation:
2 NaOH + H2SO4 → 2 H2O + Na2SO4
How many grams of NaOH are required to produce 16 g of H2O ?
7.3g of NaOH are required to produce 16 g of H2O
What are molecular weight ?
The entire mass of the atoms required to form a molecule per mole, expressed in grams, is what makes up the molar mass, also known as the molecular weight. Grams per mole are used to measure molecular mass. To determine molecular weight, count the atoms in each element and increase the result by the element's atomic weight.
Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in soaps and cleansers. Sodium hydroxide is a colorless, odorless solid at room temperature. Sodium hydroxide is a white, odorless liquid.
39 g of NaOH gives 18g of H2O
? g of NaOH gives 16g of H2O
i.e 18*16/39g
i.e. 7.3g of NaOH are required to produce 16 g of H2O
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How is s,p,d,f blocks related to the type of element and its properties?
grouping elements into s, p, d, and f blocks allows us to predict the chemical and physical properties of elements based on their electron configurations and periodic table positions.
The periodic table's s, p, d, and f blocks refer to the arrangement of electrons in the atom's outermost energy level (valence shell), and they are related to the element's type and properties in several ways.
Atomic size increases from right to left within a period and from top to bottom within a group.
Ionization Energy: The energy required to remove an electron from an atom is referred to as ionisation energy.
Electronegativity: The ability of an atom to attract electrons towards itself in a chemical bond is measured by electronegativity.
Reactivity: An element's reactivity is determined by the number of valence electrons it possesses. Because the s-block elements have one or two valence electrons, they are extremely reactive.
Chemistry: Ionic compounds are formed by s-block elements with nonmetals, whereas covalent compounds are formed by p-block elements.
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PLEASE HELP!!
Classify each reaction as synthesis, decomposition, single replacement, double
replacement, or combustion.
>
NaOH + CuSO4 → Na2 SO4 + Cu(OH)2
C12H22O11 + O2CO2 + H₂O
NH4NO3 → N₂O + H₂O
BaCl2 + Na2 SO4 → BaSO4 + NaCl
1. synthesis
2. decomposition
3.single
4double displacement
5.combustion
Answer:
NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ is a double displacement reaction
C₁₂H₂₂O₁₁ + 12O₂ --> 12CO₂ + 11H₂O. This is a combustion reaction, as it involves a fuel reacting with oxygen to form carbon dioxide and water. However, this is not a balanced equation and so I have added in the correct ratios to balance the equation.
NH₄NO₃ → N₂O + 2H₂O. This is a decomposition reaction, as it involves the compound ammonium nitrate, 'decomposing' or breaking down into smaller components: dinitrogen oxide and water
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl. This is a double replacement reaction
A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.
The pH of milk is approximately 6.6.
Steps
The formula for calculating pH is:
pH = -log[H+]
Given that [H+] of milk is about 2.51 × 10–7, we can substitute this value into the formula to calculate the pH:
pH = -log(2.51 × 10–7)
pH = -(-6.6)
pH = 6.6
Therefore, the pH of milk is approximately 6.6.
What is pH?A solution's acidity or basicity is determined by its pH. A pH of 7 indicates a neutral solution (equal concentration of H+ and OH- ions), a pH of less than 7 indicates an acidic solution (higher concentration of H+ ions), and a pH of greater than 7 indicates a basic or alkaline solution. It is defined as the negative logarithm of the hydrogen ion concentration [H+] in moles per liter (higher concentration of OH- ions).learn more about pH here
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14.87 moles of Magnesium should form 14.87 moles of Magnesium Chloride. 14.77 moles of Hydrochloric acid should form 7.97 moles of Magnesium Chloride. Only 1.78 moles of Magnesium chloride is obtained. What is the percent yield?
PLEASE HELP and teach please
According the question the Percent yield is 11.99%
What is yield?Yield is an economic term referring to the income generated by an investment over a period of time. It is usually expressed as a percentage of the initial investment and is calculated by taking the total income earned and dividing it by the initial investment. Yield is an important measure of the performance of an investment, and is a key factor in determining the attractiveness of an investment. Yields can be calculated for individual investments, or for portfolios of investments. Yields can also be calculated for different types of investments, such as stocks, bonds, and mutual funds. Yields are also used to compare investments with different levels of risk, so investors can make informed decisions about their investments. Yields are affected by a variety of factors, including interest rates, inflation, and market conditions.
The percent yield can be calculated using the formula:
Percent yield = (Actual yield / Theoretical yield) * 100
For Magnesium Chloride, the theoretical yield is 14.87 moles, and the actual yield is 1.78 moles.
Therefore, the percent yield is:
Percent yield = (1.78 / 14.87) * 100 = 11.99%
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Please help! Ty
How many protons, neutrons,
and electrons are in this ion?
31 P3-
15
A. 15 p+, 16 nº, 18 e
B. 16 pt, 15 nº, 19 e
C. 15 pt, 16 nº, 15 e-
D. 15 pt, 16 nº, 12 e-
Explanation:
The symbol P represents the element phosphorus, which has an atomic number of 15, indicating that it has 15 protons in the nucleus. The ion is negatively charged with a 3- charge, which means it has three more electrons than protons.
To find the number of neutrons in an atom or ion, you need to know its mass number, which is the sum of protons and neutrons. Since the charge of the ion is not related to its mass, we can assume that the mass number is the same as that of the neutral phosphorus atom, which is approximately 31.
So, the number of protons, neutrons, and electrons in the P3- ion is:
Protons: 15
Neutrons: 31 - 15 = 16
Electrons: 15 + 3 = 18
Therefore, the P3- ion has 15 protons, 16 neutrons, and 18 electrons.
When the same amount of force is applied to a smaller area, how is pressure affected?
Answer:
The pressure is reduced since the area needed to be exerted on by pressure has also been reduced
Potassium chlorate (KClO3) will decompose to potassium chloride (KCl) and oxygen (O2) in the reaction shown:
2KClO3(s) → 2KCl(s) + 3O2(g)
A chemist allows 20.0 grams of KClO3 to decompose and captures 6.7 grams of O2 as a
result.
Answer:
Explanation:
Theoretical yield is 7.9 g O2
% yield is actual/theoreticalx 100 = 6.7/7.9 X 100= 84.81 % O2
When a force is applied to an object, what happens?
The object changes its color.
The object changes its shape.
The object changes its motion.
The object changes its state.
When a force is applied to an object, the object changes its state. Therefore, the correct option is option D.
What is force?A force is an effect in physics that enables the movement of something with mass that change its velocity and accelerate. It may represent a push or perhaps a pull, with the direction and magnitude always present, making this one a vector quantity. It really is measured in newtons (N) and is denoted by the sign F.
Newton's second law, in its original form, states that perhaps the net force exerted on an object is equivalent to the pace that its momentum varies with time. When a force is applied to an object, the object changes its state.
Therefore, the correct option is option D.
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If the brine contains 138 g of NaCl, how much Cl2 can be produced?
Answer:
167.5g
Explanation:
From the question, we know the mass of NaCl and the molar mass of NaCl, so we can calculate the number of moles of NaCl:
Moles = mass ÷ molar mass
The molar mass of NaCl can be calculated by adding the relative formula masses of the elements Na and Cl:
23.0 + 35.5 = 58.5
We can use the formula to find the number of moles of NaCl:
moles = 138 ÷ 58.5
= 2.35897...
Now, we need to find the mass of Cl2. Rearranging the formula of moles = mass ÷ molar mass
mass = moles × molar mass
Calculating the molar mass of Cl2 by adding the relative atomic masses:
35.5 + 35.5 = 71
Hence the mass is:
2.35897... × 71 = 167.5g (to 1dp)
In science, what is it called when you have a statement that can be mathematically modeled, based
on repeated experimental observations, that describes some phenomenon of nature?
In science, a statement that can be mathematically modeled based on repeated experimental observations, that describes some phenomenon of nature, is called a scientific law. A scientific law is a descriptive statement that summarizes a pattern observed in nature, typically expressed as a mathematical equation or formula, which describes the behavior of a particular natural phenomenon under certain conditions. Scientific laws are generally considered to be well-established and reliable, based on the repeated empirical evidence and testing that supports them.
Which statement best describes a pure substance? *
It has three visible phases.
It has constant physical properties.
It is heterogeneous.
It has variable composition.
The statement which best describes a pure substance is that it has constant physical properties which is therefore denoted as option B.
What is a Pure substance?This is referred to as a single kind of matter that cannot be separated into other kinds of matter by any physical means.
This type of sample of matter has both definite and constant composition and distinct chemical properties and is referred to as being homogeneous in nature with no form of impurities which is therefore the reason why it was chosen a the correct choice.
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2. When a bubble escapes form a sunken ship, it has a volume of 12.0ml at a pressure of 400.0 atm. and a temp.. of -3.00°C. It reaches the surface where the pressure is 1.10 atm. and the temperature is 27.0°C. What is its new volume? ( round the answer to nearest tens for sig figs)
Answer: 4848.22 mL
Explanation:
V2= P1V1T2/(T1 P2) = (400.00 X 12.0 X 300.15)/(270.15 x 1.10)
How do covalent bonds differ from ionic bonds?
Answer: Covalent bonds share electrons between two or more atoms. Ionic bonds form when two or more ions come together with charge differences.
Explanation:
Ionic bonds: atoms TRANSFER electrons
Covalent: atoms SHARE electrons
How many liters of oxygen gas (at STP) are needed to burn 0.277L butane?
Explanation:
Refer to pic..........
what is the percent composition of salicylic acid?
The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O
Pls answer number 4, my grade depends on it
Answer: where are the photographs
Explanation:
(NEED HELP ASAP) Which statement is true about the particles of a solid when the solid changes into a liquid?
-They stop vibrating.
-Their kinetic energy increases.
-They move closer to each other.
-The attractive force between them increases.
When a solid changes into a liquid, the particles of the solid move farther apart and gain kinetic energy. Therefore, the statement that is true about the particles of a solid when the solid changes into a liquid is: their kinetic energy increases.
What is Kinetic Energy?
It is a scalar quantity and is dependent on the mass and velocity of an object. The formula for kinetic energy is:
Kinetic energy = (1/2) * mass * velocity^2
In a solid, the particles are tightly packed and vibrate in a fixed position. When the solid is heated or the pressure is reduced, the kinetic energy of the particles increases and they begin to vibrate faster and move slightly away from their fixed positions. This causes the solid to start melting and the particles begin to slide over each other, forming a liquid. Therefore, the particles of the solid move apart and gain kinetic energy when the solid changes into a liquid.
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Identify the Name, Symbol, number of protons, neutrons, and electrons in a neutral atom of each of the following: (Please refer to a periodic table):
Answer:
Carbon
Name: Carbon
Symbol: C
Number of protons: 6
Number of neutrons: 6 or 7 (Carbon has two stable isotopes with 6 or 7 neutrons)
Number of electrons: 6
Sodium
Name: Sodium
Symbol: Na
Number of protons: 11
Number of neutrons: 12 or 13 (Sodium has one stable isotope with 12 neutrons, and another with 13 neutrons)
Number of electrons: 11
Helium
Name: Helium
Symbol: He
Number of protons: 2
Number of neutrons: 2
Number of electrons: 2
Chlorine
Name: Chlorine
Symbol: Cl
Number of protons: 17
Number of neutrons: 18 or 20 (Chlorine has two stable isotopes with 18 or 20 neutrons)
Number of electrons: 17
Gold
Name: Gold
Symbol: Au
Number of protons: 79
Number of neutrons: 118 (Gold has only one stable isotope with 118 neutrons)
Number of electrons: 79
For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. 2 NO₂(g) +F₂(g) → NO₂F(g) AH-284 kJ/mol,zn NO₂(g) and F₂ (g) can react to produce NO₂F(g), as represented above. A proposed mechanism for the reaction has two elementary steps, as shown below. Step 1: NO₂+ F₂ NO₂F + F (slow) Step 2: NO₂+F NO₂F (fast)
(a) Write a rate law for the overall reaction that is consistent with the proposed mechanism.
Rate law for the overall reaction that is consistent with the proposed mechanism is k [NO₂] [F₂].
What is rate law expression?
It is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it multiplying with rate constant. Rate in rate law expression is decided according to slow step.
Example-
If a reaction given as A + B → C rate constant = k
rate = k [A] [B]
Given,
Step 1: NO₂+ F₂ → NO₂F + F (slow)
Step 2: NO₂+F → NO₂F (fast)
rate = k [NO₂] [F₂]
Therefore, rate law for the overall reaction that is consistent with the proposed mechanism is k [NO₂] [F₂].
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What mass og MgO is neded to produce 9. 38g of Na2O?
2NaCl+MgO=Na2O+MgCl2
The 6.10 g of MgO (Magnesium oxide) is needed to produce 9.38 g of Na2O(Sodium oxide).
To solve this problem, we need to use stoichiometry to relate the mass of Na2O produced to the mass of MgO used.
From the balanced chemical equation:
2 NaCl + MgO → Na2O + MgCl2
We can see that 1 mole of MgO produces 1 mole of Na2O. We can use the molar mass of Na2O to convert the given mass of Na2O to moles:
9.38 g Na2O x (1 mol Na2O / 61.98 g Na2O) = 0.1514 mol Na2O
Since 1 mole of MgO produces 1 mole of Na2O, we know that we need 0.1514 mol MgO to produce 0.1514 mol Na2O. Using the molar mass of MgO, we can convert this to mass:
0.1514 mol MgO x (40.31 g MgO / 1 mol MgO) = 6.10 g MgO
Therefore, 6.10 g of MgO is needed to produce 9.38 g of Na2O.
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Note: The question would be as
What mass of MgO is neded to produce 9. 38g of Na2O?
2NaCl+MgO=Na2O+MgCl2
How many grams are in 4.50x1023 molecules of CO2? [Molar mass CO2 = 44.01 g/mol CO2]
7.48x10-11 g CO2
32.9 g CO2
44.01 g CO2
6.16x1045 g CO2
The mass of 4.5 moles of CO2 is 7.48x10-11 g CO2 Option b)
What are 4 types of moles mass?The ratio between the mass and the quantity of material (measured in moles) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The molar mass of a material is a bulk characteristic rather than a molecular one. The compound's molar mass is an average over many samples, which frequently have different masses because of elements.
A terrestrial average and a result of the relative frequency of the isotopes of the component elements on Earth, the molar mass is most frequently calculated from the standard atomic weights. For changing between a substance's mass and quantity in bulk amounts, the molar mass is the proper unit.
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Based on the color of the flame emitted by known compounds, what could be the metallic ion present in each of unknown solid
The color of the flame emitted by known compounds can be used to help identify the metallic ion present in an unknown solid. Different metallic ions produce different flame colors when they come into contact with a flame.
Metal ions in unknown substances can be identified through flame tests thanks to their distinctive emission spectra.
The metallic ion contained in an unknown material can be determined using the color of the flame produced by known compounds.
When in contact with a flame, different metal ions produce distinct flame colors: sodium creates a yellow flame, whereas potassium creates a violet flame.
The presence of a metallic ion can be determined by contrasting the flame colors of the known compounds with the flame of the unknown solid.
A spectroscope must be used to evaluate the flame in order to precisely identify the metal ions contained in an unidentified substance. This can lead to a more precise identification and a more thorough investigation of the emission spectra.
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What major type of weak interactions can asp have that are absent in chymotrypsin?
In the catalytic cycle, asp is capable of weak interactions with histidine that chymotrypsin does not have.
Throughout the catalytic cycle, Asp-102 maintains its negative charge. It establishes a salt bond with the protonated form of His-57 but not the deprotonated form, stabilizing the protonated form and boosting the histidine's affinity for protons.
The histidine residue interacts with aspartate and is oriented correctly as a result. Following that, histidine and serine's alcohol group may interact. Histidine changes serine from a weak nucleophile (alcohol) into a strong nucleophile by removing the hydrogen ion from the alcohol (alkoxide).
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Explain how fossil fuels are formed from
living organisms on land and in sea.
Answer:
After millions of years underground, the compounds that make up plankton and plants turn into fossil fuels. Plankton decomposes into natural gas and oil, while plants become coal. Today, humans extract these resources through coal mining and the drilling of oil and gas wells on land and offshore.
Explanation:
Fossil fuels such as oil, coal and natural gas formed from living organisms on land and in sea are non-renewable resources created by the extinction of prehistoric plants and animals that are gradually being buried under rock layers.
Crude oil (also called crude oil or simply petroleum) is a fossil fuel formed from the remains of ancient marine organisms. After it died and sank to the bottom of the sea, the organic material mixed with other sediments and was buried.
Over the years, the rubble has been covered by layers of sand and silt. The heat and pressure of these layers helped turn the remains into what we now call oil or petroleum (fossil fuels).
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What is the mass of 2.007 moles of propane gas, C3H8?
Answer:
To calculate the mass of 2.007 moles of propane gas (C3H8), we need to first determine its molar mass.
The molar mass of propane (C3H8) can be calculated as:
3(C) + 8(H) = (3 x 12.01 g/mol) + (8 x 1.01 g/mol) = 44.11 g/mol
Therefore, the mass of 2.007 moles of propane is:
Mass = 2.007 moles x 44.11 g/mol = 88.46 g
So, the mass of 2.007 moles of propane gas (C3H8) is 88.46 g.
How many Hydrogen atoms in the formula 4H3O2
Answer:
Three atoms of Hydrogen.
Explanation:
There are four molecules of three Hydrogen atoms and two oxygen atoms.
Hope it helps.
When 12 moles of O₂ reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O₂ -> 10 CO₂ + 4H₂O
O₂
Explanation:A limiting reactant is the reactant that runs out first in a reaction.
Oxygen
To find the limiting reactant, we can find how many reactions will occur with the given amount of reactant. To do this we can divide moles of the reactant by moles per reaction. If the reaction occurs 1 time, we say that 1 mol of reaction is created. So, the reactant that forms fewer moles of reaction is the limiting reactant.
Moles of reaction = [tex]\displaystyle \frac{12molO_{2} }{1}*\frac{1molrxn}{12mol_{2} }[/tex]= 1 mol[tex]_{rxn}[/tex]This means that with 12 moles of oxygen, 1 full reaction will occur (1 mol of reaction).
Naphthalene (C₁₀H₈)
Now, we can do the same equation with Naphthalene. If it creates fewer moles of reaction, then it is the limiting reactant. If not, then oxygen is the limiting reactant.
Moles of reaction = [tex]\displaystyle \frac{1.1molC_{10}H_{8} }{1} *\frac{1molrxn}{1molC_{10}H_{8}}[/tex] = 1.1 mol[tex]_{rxn}[/tex]This means that 1.1 moles of Naphthalene will create 1.1 mol of reaction.
Limiting Reactant
The math above shows that the amount of oxygen given will only create 1 mol of reaction, while the Naphthalene forms 1.1 mols of reaction. Thus, oxygen is the limiting reactant because it creates fewer moles of reaction.