PMA 2 Review

Front

What is frequency in the context of waves?

Back

Frequency is the number of waves that pass a given point in a specific amount of time, usually measured in Hertz (Hz).

Front

What is the purpose of an experiment in the scientific method?

Back

An experiment is conducted to test a hypothesis by manipulating variables and observing the effects.

Front

What is a controlled experiment?

Back

A controlled experiment is one in which only one variable is changed at a time while all other variables are kept constant.

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.

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 a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change occurs when a substance transforms into a different substance with different properties.

Front

What is a variable in an experiment?

Back

A variable is any factor, trait, or condition that can exist in differing amounts or types in an experiment.

Front

What is the difference between independent and dependent variables?

Back

The independent variable is the one that is changed or controlled in an experiment, while the dependent variable is the one that is measured or tested.

Front

What is a hypothesis?

Back

A hypothesis is a testable prediction about the relationship between two or more variables.