Question 1

Which of the following best describes a compound?

Accepted Answer

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

Question 2

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

Accepted Answer

Water boiling to form steam.

Question 3

Which property is intensive?

Accepted Answer

Density

Question 4

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

Accepted Answer

Filtration and evaporation

Question 5

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 6

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 7

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm$$^3. $$What is the density of gold?

Accepted Answer

$$19.3\ \mathrm{g/cm^3$}$$

Question 8

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 9

Convert $$25.0\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 10

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

Accepted Answer

Salt dissolved in water

Question 11

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 12

Which of the following is the correct conversion factor to change centimeters to inches?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 13

Which of the following is an extensive property?

Accepted Answer

Mass

Question 14

A solution of copper(II) sulfate is blue. This is an example of which type of property?

Accepted Answer

Physical property

Question 15

Which of the following best describes kinetic energy?

Accepted Answer

Energy of motion, dependent on mass and velocity

Question 16

How many significant figures are in the measurement 0.004560 g?

Accepted Answer

4

Question 17

Which separation technique would be most effective for separating a mixture of two liquids with different boiling points?

Accepted Answer

Distillation

Question 18

A sample of ethanol has a density of $$0.789\ \mathrm{g/mL}. $$What is the mass of $$50.0\ \mathrm{mL} of $$ethanol?

Accepted Answer

$$39.5\ \mathrm{g}$$

Question 19

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

Accepted Answer

Copper reacting with nitric acid to form a blue solution and brown gas

Question 20

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Chapter 1: Introduction to Matter, Energy, and Measurement – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard