Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of atoms of two or more different elements in fixed proportions.

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

A student separates a mixture of sand and salt by adding water, filtering, and then evaporating the water from the filtrate. Which separation techniques are used in this process?

Accepted Answer

Filtration and evaporation

Question 4

Which of the following statements about the Law of Constant Composition is correct?

Accepted Answer

The relative number of atoms of each element in a compound is always the same.

Question 5

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 6

A sample of water is heated from $$25\ ^\circ\mathrm{C} to$$ $$75\ ^\circ\mathrm{C}. $$Which of the following best describes this process?

Accepted Answer

A physical change

Question 7

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 8

Convert $$25\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$25\ ^\circ\mathrm{C} = 273.15 + 25 = 298.15\ \mathrm{K}$$

Question 9

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with the same composition throughout the sample.

Question 10

A student measures the mass of a sample three times and gets values of 2.51 g, 2.50 g, and 2.52 g. The true mass is 2.00 g. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 11

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$E_k = \frac{1}{2}mv^2$

Question 12

Which of the following is an example of a physical property that can be used to separate a mixture by distillation?

Accepted Answer

Boiling point

Question 13

How many significant figures are in the measurement 0.004560 g?

Accepted Answer

4

Question 14

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 15

A solution is prepared by dissolving 10 g of NaCl in 100 mL of water. What type of matter is this solution?

Accepted Answer

Homogeneous mixture

Question 16

Which of the following conversion factors would you use to convert centimeters to meters?

Accepted Answer

$$1\ \mathrm{cm} = 0.01\ \mathrm{m}$$

Question 17

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

Accepted Answer

Burning wood

Question 18

A sample has a mass of 15.0 g and a volume of 3.0 mL. What is its density?

Accepted Answer

$$5.0\ \mathrm{g/mL}$$

Question 19

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 20

Which of the following best describes the difference between precision and accuracy?

Accepted Answer

Precision is how close measurements are to each other; accuracy is how close measurements are to the true value.

Introduction to Chemistry: Matter, Energy, and Measurement

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