Quiz about S2 6 Week Key Terms Reteach Tutorial

Question 1

Define the term "mole" in chemistry.

Accepted Answer

A unit of measurement for amount of substance

Answer

A unit of volume used to measure liquids

Answer

A unit of temperature measurement

Answer

A unit of pressure measurement

Question 2

What is the molar mass of water ( $$H_2O$$ )?

Accepted Answer

18 g/mol

Answer

16 g/mol

Answer

20 g/mol

Answer

22 g/mol

Question 3

Convert 2 moles of carbon dioxide ( $$CO_2$$ ) to grams. (Molar mass of $$CO_2$$ = 44 g/mol)

Accepted Answer

88 g

Answer

44 g

Answer

22 g

Answer

176 g

Question 4

Calculate the number of molecules in 3 moles of water ( $$H_2O$$ ) .

Accepted Answer

$$1.806 imes 10^{24}$$ molecules

Answer

$$3.011 imes 10^{23}$$ molecules

Answer

$$9.033 imes 10^{23}$$ molecules

Answer

$$1.204 imes 10^{24}$$ molecules

Question 5

How many atoms are there in 0.5 moles of sodium ( $$Na$$ )?

Accepted Answer

$$3.011 imes 10^{23}$$ atoms

Answer

$$6.022 imes 10^{23}$$ atoms

Answer

$$1.204 imes 10^{24}$$ atoms

Answer

$$1.806 imes 10^{23}$$ atoms

Question 6

Calculate the percent composition of carbon in methane ( $$CH_4$$ ). (Molar mass of $$C = 12$$ g/mol, $$H = 1$$ g/mol)

Accepted Answer

75%

Answer

80%

Answer

85%

Answer

92%

Question 7

What is the percent composition of hydrogen in water ( $$H_2O$$ )?

Accepted Answer

11.1%

Answer

22.2%

Answer

33.3%

Answer

44.4%

Question 8

Balance the following chemical equation: $$C_3H_8 + O_2 \rightarrow CO_2 + H_2O$$

Accepted Answer

$$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$$

Answer

$$C_3H_8 + 4O_2 \rightarrow 3CO_2 + 4H_2O$$

Answer

$$C_3H_8 + 6O_2 \rightarrow 3CO_2 + 4H_2O$$

Answer

$$C_3H_8 + 5O_2 \rightarrow 2CO_2 + 4H_2O$$

Question 9

Write the balanced chemical equation for the combustion of ethane ( $$C_2H_6$$ ).

Accepted Answer

$$C_2H_6 + 3.5O_2 \rightarrow 2CO_2 + 3H_2O$$

Answer

$$C_2H_6 + 2O_2 \rightarrow 2CO_2 + 3H_2O$$

Answer

$$C_2H_6 + 3O_2 \rightarrow 2CO_2 + 3H_2O$$

Answer

$$C_2H_6 + 3.5O_2 \rightarrow 2CO_2 + 6H_2O$$

Question 10

What is the law of conservation of mass?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction.

Answer

Mass can be created and destroyed.

Answer

Mass is always increased in a chemical reaction.

Answer

Mass is always decreased in a chemical reaction.

Question 11

Calculate the number of moles in 36 grams of water ( $$H_2O$$ ). (Molar mass of $$H_2O = 18$$ g/mol)

Accepted Answer

2 moles

Answer

1 mole

Answer

3 moles

Answer

4 moles

Question 12

If you have 0.25 moles of $$NaCl$$ , how many molecules of $$NaCl$$ do you have?

Accepted Answer

$$1.5055 imes 10^{23}$$ molecules

Answer

$$3.011 imes 10^{23}$$ molecules

Answer

$$1.2044 imes 10^{23}$$ molecules

Answer

$$2.4088 imes 10^{23}$$ molecules

Question 13

Calculate the percent composition of oxygen in carbon dioxide ( $$CO_2$$ ). (Molar mass of $$C = 12$$ g/mol, $$O = 16$$ g/mol)

Accepted Answer

72.7%

Answer

66.7%

Answer

50%

Answer

44%

Question 14

In a chemical reaction, what are the substances called that are present at the start of the reaction?

Accepted Answer

Reactants

Answer

Products

Answer

Yields

Answer

Coefficients

Question 15

In a chemical equation, what does the arrow symbol ( $$\rightarrow$$ ) represent?

Accepted Answer

Yields

Answer

Products

Answer

Reactants

Answer

Coefficients

Question 16

What is the term for the numbers placed in front of compounds in a chemical equation to balance it?

Accepted Answer

Coefficients

Answer

Products

Answer

Reactants

Answer

Yields

Question 17

What is the principle that states mass is neither created nor destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Answer

Law of Conservation of Energy

Answer

Law of Conservation of Momentum

Answer

Law of Conservation of Charge

Question 18

What is the process of converting one unit of measure to another called?

Accepted Answer

Dimensional Analysis

Answer

Dimension swapping

Answer

Unit analysis

Answer

All of the above

Question 19

What is Avogadro's Number?

Accepted Answer

$$6.022 imes 10^{23}$$

Answer

$$3.14$$

Answer

$$9.81 \, ext{m/s}^2$$

Answer

$$1.602 imes 10^{-19}$$

Question 20

What is the average atomic mass of an element?

Accepted Answer

The weighted average of the masses of the isotopes of an element

Answer

The sum of protons and neutrons in an atom

Answer

The mass of a single atom

Answer

The number of protons in an atom

Question 21

What is the molar mass of a substance?

Accepted Answer

The mass of one mole of a substance

Answer

The mass of one atom of a substance

Answer

The mass of one molecule of a substance

Answer

The mass of one electron of a substance

Question 22

What is percent composition?

Accepted Answer

The percentage by mass of each element in a compound

Answer

The percentage by volume of each element in a compound

Answer

The percentage by number of atoms of each element in a compound

Answer

The percentage by number of molecules of each element in a compound

Question 23

What is a conversion factor?

Accepted Answer

A ratio used to convert from one unit to another

Answer

A constant used to convert from one unit to another

Answer

A variable used to convert from one unit to another

Answer

A formula used to convert from one unit to another

Question 24

What are particles in the context of chemistry?

Accepted Answer

Atoms, molecules, and ions

Answer

Only atoms

Answer

Only molecules

Answer

Only ions

Question 25

What is a molecule?

Accepted Answer

A group of atoms bonded together

Answer

A single atom

Answer

A charged atom

Answer

A mixture of different atoms

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