ACT Science Vocabulary

Front

deca-

Back

ten

Front

a close relationship between two organisms that is mutually beneficial

Back

symbiosis

Front

This is a type of system that allows energy but not matter across its system boundary

Back

closed system

Front

Element

Back

a substance composed of atoms with the same atomic number which cannot be split into smaller substances

Front

Existing independent of any other cause; free from imperfection

Back

absolute

Front

What is the term for a substance that speeds up a chemical reaction without being consumed?

Back

catalyst

Front

What is the process by which plants convert sunlight into chemical energy?

Back

photosynthesis

Front

What is the term for the measure of the amount of matter in an object?

Back

mass

Front

What is the term for the variable that is changed or controlled in a scientific experiment?

Back

independent variable

Front

What is the term for the variable that is measured in an experiment?

Back

dependent variable