PAX PAX Chemistry and Physical Science 2

Question 1

What happens during an exothermic reaction?

Accepted Answer

Energy is released to the surroundings

Answer

Energy is absorbed from the surroundings

Answer

No energy change occurs

Answer

Temperature decreases

Question 2

What is the formula for calculating density?

Accepted Answer

Density = Mass / Volume

Answer

Density = Mass + Volume

Answer

Density = Volume / Mass

Answer

Density = Mass × Volume

Question 3

An acid and a base react to form water and a salt. This type of reaction is called:

Accepted Answer

Neutralization

Answer

Oxidation

Answer

Reduction

Answer

Decomposition

Question 4

What is Newton's First Law of Motion?

Accepted Answer

An object at rest stays at rest unless acted on by an external force

Answer

Force equals mass times acceleration

Answer

For every action there is an equal and opposite reaction

Answer

Energy is neither created nor destroyed

Question 5

Which of the following is a chemical change?

Accepted Answer

Wood burning

Answer

Ice melting

Answer

Salt dissolving in water

Answer

Glass breaking

Question 6

What does the symbol 'Na' represent on the periodic table?

Accepted Answer

Sodium

Answer

Nitrogen

Answer

Neon

Answer

Nickel