OSE 7.1 Chemical Reactions Lesson 1

Front

What is a chemical reaction?

Back

A process where substances (reactants) change into new substances (products) with different properties.

Front

What are reactants in a chemical reaction?

Back

The starting substances that undergo change during a chemical reaction.

Front

What are products in a chemical reaction?

Back

The new substances formed as a result of a chemical reaction.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What is an example of a physical change?

Back

Melting ice is a physical change; the substance remains water.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change; it transforms into ash and smoke.

Front

What is an observation in a scientific experiment?

Back

Information gathered through the senses, such as color change or temperature change.

Front

What is a hypothesis?

Back

A testable prediction about the outcome of an experiment.

Front

What is a variable in an experiment?

Back

A factor that can change and affect the outcome of an experiment.

Front

What is a control in an experiment?

Back

A standard for comparison that remains constant throughout the experiment.