Question 1

Which statement best describes the Law of Conservation of Mass as developed by Lavoisier?

Accepted Answer

In a chemical reaction, matter is neither created nor destroyed.

Question 2

A student mixes 50.0 g of water with 10.0 g of salt to make a solution. After evaporation, only the salt remains. What type of change has occurred?

Accepted Answer

Physical change

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

Flammability

Question 4

A cube of metal has an edge length of 11.4 mm and a density of $$2.70 \ \mathrm{g/cm^3$}. $$What is its mass in grams?

Accepted Answer

39.6 g

Question 5

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in a fixed, definite proportion

Question 6

Which of the following is a heterogeneous mixture?

Accepted Answer

Chicken noodle soup

Question 7

Which SI base unit is used to measure mass?

Accepted Answer

Kilogram

Question 8

Convert 358 K to degrees Celsius using the appropriate formula.

Accepted Answer

$$358 - 273.15 = 84.85^\circ \mathrm{C}$$

Question 9

A ring has a mass of 6.28 g and a volume of 0.325 cm$$^3. $$What is its density?

Accepted Answer

$$6.28 / 0.325 = 19.3 \ \mathrm{g/cm^3$}$$

Question 10

Which of the following is a physical property that can be observed without changing the composition of a substance?

Accepted Answer

Boiling point

Question 11

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Gram

Question 12

Which type of energy is associated with the random motion of atoms and molecules in matter?

Accepted Answer

Thermal energy

Question 13

A student measures the mass of a liquid as 68.4 g and its density as $$1.32 \ \mathrm{g/mL}. $$What is the volume of the liquid?

Accepted Answer

$$68.4 / 1.32 = 51.8 \ \mathrm{mL}$$

Question 14

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can be separated into their components by physical methods.

Question 15

Which of the following is a tentative explanation for an observation that can be tested by experiments?

Accepted Answer

Hypothesis

Question 16

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$^\circ \mathrm{F} = 1.8(^\circ \mathrm{C}) + 32$$

Question 17

Which of the following best describes Dalton's atomic theory?

Accepted Answer

All matter is composed of small, indestructible particles called atoms.

Question 18

A student wants to separate a mixture of sand and salt. Which method should they use?

Accepted Answer

Filtration

Question 19

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 20

Which of the following is the correct definition of density?

Accepted Answer

Density is the ratio of mass to volume.

Foundations of General Chemistry: Matter, Measurement, and Properties

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