Question 1

Which of the following best describes why gases are compressible, according to the kinetic-molecular theory?

Accepted Answer

Gas particles are far apart and move freely, leaving large spaces between them.

Question 2

A sample of water is heated from 25 °C to 110 °C. Which phase changes does it undergo as the temperature increases?

Accepted Answer

Vaporization only

Question 3

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

Accepted Answer

Salt water

Question 4

Which of the following statements about elements and compounds is correct?

Accepted Answer

Compounds can be chemically separated into elements.

Question 5

Which property is NOT characteristic of metals?

Accepted Answer

Brittle and dull

Question 6

Which of the following is the correct chemical formula for a molecule containing 6 carbon atoms, 6 hydrogen atoms, 2 nitrogen atoms, and 1 oxygen atom?

Accepted Answer

$$\mathrm{C_6H_6N_2O}$$

Question 7

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 8

According to the law of conservation of mass, what happens to the total mass during a chemical reaction?

Accepted Answer

It remains constant

Question 9

Which of the following best describes potential energy?

Accepted Answer

Energy stored due to position or composition

Question 10

A 2 kg object is moving at 3 m/s. What is its kinetic energy? Use $$KE = \frac{1}{2}mv^2$.

Accepted Answer

$$18\ \mathrm{J}$$

Question 11

Which of the following is NOT a form of energy?

Accepted Answer

Density

Question 12

Which law states that compounds always contain the same elements in a constant proportion by mass?

Accepted Answer

Law of Definite Composition

Question 13

Which element is the most abundant in the human body by mass?

Accepted Answer

Oxygen

Question 14

Which of the following is a physical property?

Accepted Answer

Melting point

Question 15

Which of the following best explains why filling a gas tank in the cool morning delivers a slightly greater mass of gasoline for the same volume?

Accepted Answer

Gasoline contracts at lower temperatures, increasing its density.

Question 16

Which of the following is a correct statement about the arrangement of elements on the periodic table?

Accepted Answer

Elements are arranged by increasing atomic number.

Question 17

Which of the following is a semimetal (metalloid) and is also a semiconductor?

Accepted Answer

Silicon

Question 18

A gas changes directly to a solid. What is this phase change called?

Accepted Answer

Deposition

Question 19

Which of the following is the correct formula for calculating the potential energy (PE) of an object of mass $$m at $$height $$h$$ above the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$PE = mgh$$

Question 20

Which of the following is evidence that a chemical change has occurred?

Accepted Answer

A gas is released and a permanent color change occurs

Matter and Energy: States, Classification, and Properties

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