Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

A student dissolves table salt (NaCl) in water. Which type of change is this, and why?

Accepted Answer

Physical change, because the salt can be recovered by evaporating the water.

Question 3

Which of the following is a heterogeneous mixture?

Accepted Answer

Water and copper

Question 4

Which of the following is NOT a physical property?

Accepted Answer

Ability to burn

Question 5

A sample of copper is drawn into thin wires. What type of change is this?

Accepted Answer

Physical change

Question 6

Which of the following statements about gases is correct?

Accepted Answer

Gases take the shape and volume of their container.

Question 7

Convert a body temperature of $$37\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$310\ \mathrm{K}$$

Question 8

A person with hypothermia has a body temperature of $$34.8\ ^\circ\mathrm{C}. $$What is this temperature in degrees Fahrenheit? Use $$T_F = 1.8T_C + 32.$$

Accepted Answer

$$94.6\ ^\circ\mathrm{F}$$

Question 9

Which of the following is an example of kinetic energy?

Accepted Answer

Rollerblading

Question 10

How many calories are equivalent to $$150\ \mathrm{J} of $$energy? Use $$1\ \mathrm{cal} = 4.184\ \mathrm{J}.$$

Accepted Answer

$$36\ \mathrm{cal}$$

Question 11

Which of the following is a chemical property?

Accepted Answer

Ability to rust

Question 12

A brass instrument is made from a homogeneous mixture of copper and zinc. Which classification best describes brass?

Accepted Answer

Homogeneous mixture

Question 13

Which of the following best describes the particles in a solid?

Accepted Answer

Particles are held close together in a fixed arrangement and vibrate slowly.

Question 14

A student heats sugar until it turns into a caramel-colored substance. What type of change is this?

Accepted Answer

Chemical change

Question 15

Which of the following is a correct conversion for the freezing point of water?

Accepted Answer

$$0\ ^\circ\mathrm{C}$$

Question 16

A mixture of sand and salt can be separated by which method?

Accepted Answer

Filtration

Question 17

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

Accepted Answer

Ice melting

Question 18

A scuba diver uses a breathing mixture called nitrox, which contains oxygen and nitrogen gases. This mixture is best classified as:

Accepted Answer

A homogeneous mixture

Question 19

Which equation correctly converts Celsius to Fahrenheit?

Accepted Answer

$$T_F = 1.8T_C + 32$$

Question 20

Which of the following is an example of potential energy?

Accepted Answer

A stretched rubber band

Chapter 3: Matter and Energy – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard