$$\frac{10.00 - 9.80}{10.00} \times 100 = 2\%$$

$$\frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100$$

Question 1

Which of the following statements best describes the law of conservation of mass?

Accepted Answer

The total mass of reactants and products in a chemical reaction is always equal.

Question 2

A student measures the mass of a sample as 12.305 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Oil and water

Question 4

Which instrument would you use to most accurately deliver a fixed volume of liquid in a titration?

Accepted Answer

Volumetric pipet

Question 5

Which of the following is a physical property?

Accepted Answer

Density

Question 6

A compound is formed from two elements, A and B, in a fixed ratio. Which law does this illustrate?

Accepted Answer

Law of definite proportions

Question 7

Which of the following is a diatomic element that is a liquid at room temperature?

Accepted Answer

Bromine ($$\mathrm{Br}_2)$$

Question 8

Which of the following best describes an exothermic reaction?

Accepted Answer

A reaction that releases energy to its surroundings, usually as heat.

Question 9

What is the percent error if the experimental value is 9.80 g and the true value is 10.00 g?

Accepted Answer

$$\frac{10.00 - 9.80}{10.00} 	imes 100 = 2\%$$

Question 10

Which of the following is NOT a chemical change?

Accepted Answer

Dissolving sugar in water

Question 11

Which of the following compounds is named correctly according to the rules for binary covalent compounds?

Accepted Answer

Carbon dioxide ($$\mathrm{CO}_2)$$

Question 12

A graduated cylinder is used to measure 25.0 mL of water. What is the correct way to read the volume?

Accepted Answer

Read at the bottom of the meniscus at eye level.

Question 13

Which of the following is an intensive property?

Accepted Answer

Density

Question 14

Which prefix is used for 7 atoms in naming covalent compounds?

Accepted Answer

Hepta-

Question 15

Which of the following is a physical separation technique based on boiling point differences?

Accepted Answer

Distillation

Question 16

Which of the following statements about metalloids is TRUE?

Accepted Answer

Metalloids have properties of both metals and nonmetals.

Question 17

A mixture of sand and salt is best separated by which sequence of physical separation techniques?

Accepted Answer

Filtration followed by evaporation

Question 18

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 19

Which of the following is a correct statement about solids?

Accepted Answer

Solids have a fixed volume and rigid shape.

Question 20

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$$\frac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100$$

General Chemistry Unit 1: Matter, Measurement, and Chemical Nomenclature

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