8th Reg Sci - Q2 Exam Practice Questions

Front

What is the relationship between the number of naturally occurring elements and the number of compounds?

Back

Elements combine in different ways to create many more than 92 compounds.

Front

Why does increased cellular respiration cause people to breathe faster during exercise?

Back

More oxygen is needed to produce energy, and more carbon dioxide waste must be removed from the body.

Front

Which gas is required for cellular respiration?

Back

Oxygen

Front

What does the Law of Conservation of Mass state?

Back

In a chemical reaction, the total mass of reactants must equal the total mass of products.

Front

Provide an example of the Law of Conservation of Mass.

Back

Combining 1 kg of hydrogen gas and 1 kg of oxygen gas to create 2 kg of water.

Front

What occurs in all living things during the process of living and growing?

Back

Energy changes from one form to another.

Front

Define a compound in chemistry.

Back

A compound is a substance formed when two or more elements chemically bond together.

Front

What is cellular respiration?

Back

Cellular respiration is the process by which cells convert glucose and oxygen into energy, carbon dioxide, and water.

Front

What is the primary purpose of breathing?

Back

To supply oxygen for cellular respiration and remove carbon dioxide from the body.

Front

Explain the concept of energy transformation.

Back

Energy transformation is the process of changing energy from one form to another, such as from chemical energy in food to kinetic energy in movement.