MAP Science 5

Question 1

A student tests whether fertilizer amount affects plant height. What is the independent variable?

Accepted Answer

Amount of fertilizer

Answer

The independent variable is the factor the experimenter deliberately changes, here the fertilizer amount.

Question 2

Why should an experiment include multiple trials?

Accepted Answer

To increase reliability and reduce the effect of random errors

Answer

Repeating trials helps show results are consistent and not due to chance.

Question 3

When baking soda and vinegar are mixed, bubbles form and the mixture gets colder. What does this show?

Accepted Answer

A chemical reaction that absorbs heat (endothermic)

Answer

Gas production signals a chemical reaction, and cooling means energy is absorbed, so it is endothermic.

Question 4

In a sealed container, 10 g of reactants undergo a chemical reaction. What is the mass of the products?

Accepted Answer

10 g

Answer

The law of conservation of mass states mass is neither created nor destroyed in a closed system.

Question 5

Which of these is a physical change?

Accepted Answer

Ice melting

Answer

Melting changes only the state of water, not its chemical identity.

MAP - Missouri Assessment Program Practice Test