Beane Unit 5 Chemistry Test

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1. Match the following terms with the correct definitions. 
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About This Quiz
Beane Unit 5 Chemistry Test - Quiz

The Beane Unit 5 Chemistry Test assesses key concepts such as molar mass, Avogadro's number, empirical formulas, and compound composition. It is designed to evaluate understanding in chemical... see morecomposition and calculations, crucial for advanced chemistry studies. see less

2. Match the following terms with the correct definitions. 
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3. What are the correct coefficients for the following equation?

Explanation

The correct coefficients for the equation are 1, 2, 2, 1.

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4. What is the molar mass of water?

Explanation

The molar mass of water is 18.02. Molar mass is the mass of one mole of a substance, and in the case of water, it is calculated by adding the atomic masses of two hydrogen atoms (1.01 g/mol each) and one oxygen atom (16.00 g/mol). Therefore, the molar mass of water is 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol.

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5. What is the value used for Avogadro's number?

Explanation

Avogadro's number is a fundamental constant in chemistry and physics that represents the number of atoms, molecules, or particles in one mole of a substance. The value used for Avogadro's number is 6.02 x 10^23, which means that one mole of any substance contains 6.02 x 10^23 atoms or molecules. This value is derived from experimental measurements and is widely accepted in scientific calculations and equations.

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6. In which situation is a chemical reaction occurring?

Explanation

A chemical reaction is occurring when a nail rusts. Rusting is a chemical process that involves the reaction of iron with oxygen and water, resulting in the formation of iron oxide. This process is an example of oxidation, where the iron atoms lose electrons and undergo a chemical change. In contrast, salt dissolving in water, ice melting, and a glass window breaking are physical changes rather than chemical reactions.

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7. What are the reactants in the following equation? H2 + O2 → 2H2

Explanation

The reactants in the given equation are hydrogen and oxygen.

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8. A compound  is found to contain 46.66% nitrogen and 53.34 % oxygen, what is the empirical formula?

Explanation

The empirical formula of the compound can be determined by converting the percentages of nitrogen and oxygen into moles. Assuming a 100g sample, there would be 46.66g of nitrogen and 53.34g of oxygen in the compound. Using the molar masses of nitrogen (14.01 g/mol) and oxygen (16.00 g/mol), we can calculate the moles of each element. The ratio of moles of nitrogen to moles of oxygen is approximately 2:3. Therefore, the empirical formula of the compound is N2O3.

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9. Calculate the number of moles in 8.0 g of sodium hydroxide, NaOH.

Explanation

The correct answer is .20. To calculate the number of moles, we need to use the molar mass of sodium hydroxide. The molar mass of NaOH is 22.99 + 16.00 + 1.01 = 40.00 g/mol. We can use the formula: moles = mass/molar mass. Plugging in the values, we get moles = 8.0 g / 40.00 g/mol = 0.20 mol.

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10. What is the percent of oxygen in Fe2(SO4)3?

Explanation

The percent of oxygen in Fe2(SO4)3 can be calculated by finding the molar mass of oxygen in the compound and dividing it by the molar mass of the entire compound. In Fe2(SO4)3, there are 12 oxygen atoms with a molar mass of 16 g/mol each, giving a total mass of 192 g/mol. The molar mass of the entire compound is 399.88 g/mol. Dividing 192 g/mol by 399.88 g/mol and multiplying by 100 gives a result of approximately 48%. Therefore, the correct answer is 48%.

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11. What kind of reaction does the above equation represent?

Explanation

The given equation represents a double replacement reaction. In a double replacement reaction, the cations and anions of two different compounds switch places, resulting in the formation of two new compounds. This process typically occurs when the reactants are in an aqueous solution and precipitates or gases are formed as products.

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12. A substance has an empirical formula of .  If the molar mass is 90 g/mol, what is the molecular formula?

Explanation

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13. How many moles are 345 g of Na?

Explanation

The molar mass of Na (sodium) is 22.99 g/mol. To find the number of moles, we divide the given mass (345 g) by the molar mass of Na. 345 g / 22.99 g/mol = 15.0 mol. Therefore, 345 g of Na is equal to 15.0 moles.

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14. What type of reaction is this?

Explanation

A single replacement reaction, also known as a substitution reaction, occurs when one element replaces another element in a compound. In this type of reaction, a more reactive element displaces a less reactive element in a compound, resulting in the formation of a new compound. This can be represented by the general equation A + BC → AC + B, where A is the more reactive element and B is the less reactive element.

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15. Fossil fuels that contain carbon, such as coal, petroleum and natural gas, combine with oxygen to produce carbon dioxide gas and energy often in the form of heat.  These processes are example of which type of reactions?

Explanation

Fossil fuels, like coal, petroleum, and natural gas, undergo a reaction with oxygen where they combine to produce carbon dioxide gas and energy, usually in the form of heat. This type of reaction is known as an exothermic reaction because it releases energy in the form of heat.

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16. In the following formula what is the substance that is oxidizing agent? 

Explanation

The substance that is the oxidizing agent in the given formula is Cu.

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17. In the following formula what is the substance that is reduced? 

Explanation

In the given formula, Cu is the substance that is reduced. Reduction is a chemical reaction in which a substance gains electrons. In this case, Cu is undergoing reduction, meaning it is gaining electrons and being reduced to a lower oxidation state.

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18. Which of the following compounds has a formula with no subscripts?

Explanation

Sodium hydroxide has a formula with no subscripts because it consists of only one sodium atom and one hydroxide ion. The sodium atom has a +1 charge, while the hydroxide ion has a -1 charge. To balance the charges, only one of each is needed, resulting in the formula NaOH.

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19. In the following formula what is the substance that is reducing agent? 

Explanation

Aluminum (Al) is the substance that acts as a reducing agent in the given formula. A reducing agent is a substance that donates electrons to another substance, causing it to be reduced. In this case, Al is donating electrons to another substance, causing it to be reduced.

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20. The molar mass for copper(II) sulfate pentahydrate is

Explanation

The molar mass of copper(II) sulfate pentahydrate can be calculated by adding up the atomic masses of all the elements present in the compound. Copper has an atomic mass of 63.55 g/mol, sulfur has an atomic mass of 32.06 g/mol, oxygen has an atomic mass of 16.00 g/mol, and hydrogen has an atomic mass of 1.01 g/mol. Since there are five water molecules (H2O) in the compound, we need to multiply the atomic mass of water (18.02 g/mol) by 5. Adding up all these atomic masses gives a molar mass of 249.6 g/mol for copper(II) sulfate pentahydrate.

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21. In the following formula what is the substance that is oxidized? 

Explanation

The substance that is oxidized in the given formula is Al (aluminum).

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22. Propane, C3H8 (g), burns in oxygen to form carbon dioxide and water.  Which equation correctly shows this reaction?    

Explanation

The correct equation for the combustion of propane in oxygen is C3H8 + 5O2 → 3CO2 + 4H2O. This equation shows that one molecule of propane reacts with five molecules of oxygen to produce three molecules of carbon dioxide and four molecules of water.

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23. Which is the balanced equation for zinc added to sulfuric acid producing hydrogen gas and zinc sulfate?

Explanation

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24.  When the above equation is balanced, what is the coefficient for nickle (III) oxide?  

Explanation

In a balanced chemical equation, the coefficients represent the number of molecules or atoms of each substance involved in the reaction. In this equation, the coefficient for nickel (III) oxide is 1, indicating that there is only one molecule of nickel (III) oxide involved in the reaction.

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Match the following terms with the correct definitions. 
Match the following terms with the correct definitions. 
What are the correct coefficients for the following equation?
What is the molar mass of water?
What is the value used for Avogadro's number?
In which situation is a chemical reaction occurring?
What are the reactants in the following equation? H2 +...
A compound  is found to contain 46.66% nitrogen and 53.34 %...
Calculate the number of moles in 8.0 g of sodium hydroxide, NaOH.
What is the percent of oxygen in Fe2(SO4)3?
What kind of reaction does the above equation represent?
A substance has an empirical formula of .  If the molar mass is...
How many moles are 345 g of Na?
What type of reaction is this?
Fossil fuels that contain carbon, such as coal, petroleum and natural...
In the following formula what is the substance that is oxidizing...
In the following formula what is the substance that is reduced? 
Which of the following compounds has a formula with no subscripts?
In the following formula what is the substance that is reducing...
The molar mass for copper(II) sulfate pentahydrate is
In the following formula what is the substance that is oxidized? 
Propane, C3H8 (g), burns in oxygen to form carbon dioxide and...
Which is the balanced equation for zinc added to sulfuric acid...
 When the above equation is balanced, what is the coefficient for...
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