Science Quiz for Grade 7 Students

What is a chemical reaction?

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a physical change in matter.

• A chemical reaction is a change in temperature.

• A chemical reaction is a biological process.

Explain the difference between potential energy and kinetic energy.

• Potential energy is related to temperature, while kinetic energy is related to pressure.

• Potential energy is the energy of motion, while kinetic energy is the energy of position.

• Potential energy is stored energy, while kinetic energy is energy in motion.

• Potential energy is energy in motion, while kinetic energy is stored energy.

How does Newton's third law of motion apply to everyday situations?

• In everyday situations, Newton's third law of motion can be seen when walking (action of pushing back on the ground propels you forward), swimming (pushing water back moves you forward), or even sitting (gravity pulls you down, but the chair exerts an equal force upwards).

• Newton's third law of motion is only relevant in scientific experiments and not in everyday life

• Newton's third law of motion only applies in outer space where there is no gravity

• In everyday situations, Newton's third law of motion can be seen when standing still (no forces are acting on you)

What is the law of conservation of mass in chemical reactions?

• In chemical reactions, the total mass of the reactants equals the total mass of the products.

• The law of conservation of mass only applies to solid reactants and products.

• The law of conservation of mass states that mass can be created or destroyed in chemical reactions.

• In chemical reactions, the total mass of the reactants is always less than the total mass of the products.

Describe the relationship between force and acceleration.

• F = mv^2

• F = ma

• A = ma

• Force is inversely proportional to acceleration