AFCT General Science: Physical and Chemical 2

Question 1

What is Newton's Second Law of Motion?

Accepted Answer

Force equals mass times acceleration (F = ma)

Answer

An object at rest stays at rest unless acted upon by a force

Answer

For every action there is an equal and opposite reaction

Answer

Energy cannot be created or destroyed

Question 2

What is the difference between an element and a compound?

Accepted Answer

Elements contain only one type of atom; compounds contain two or more types of atoms chemically bonded together

Answer

Elements are always solids; compounds are always liquids

Answer

There is no difference between them

Answer

Elements are found in nature; compounds are only made in laboratories

Question 3

What is the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another

Answer

Energy always decreases in a closed system

Answer

Energy can be created by nuclear reactions

Answer

Energy is conserved only in chemical reactions

Question 4

What is the pH scale used to measure?

Accepted Answer

The acidity or alkalinity of a solution

Answer

Temperature of a solution

Answer

The density of a liquid

Answer

The electrical conductivity of water

Question 5

What is the difference between heat and temperature?

Accepted Answer

Heat is the total thermal energy transferred between objects; temperature measures the average kinetic energy of particles

Answer

There is no difference; they are the same thing

Answer

Temperature measures heat content; heat measures molecular speed

Answer

Heat applies only to gases; temperature applies to all states of matter

Question 6

What type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Metallic bond

Answer

Hydrogen bond