6th Grade Chemical Changes & Reactions

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. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and digestion.

Front

What happens to air molecules when they are heated?

Back

When air molecules are heated, they gain energy and move apart, causing the air to expand.

Front

Where are the reactants located in a chemical equation?

Back

The reactants are located on the left side of a chemical equation.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as flammability or reactivity.

Front

What is flammability?

Back

Flammability is the ability of a substance to catch fire and burn in the presence of an ignition source.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction, found on the right side of a chemical equation.

Front

In the equation 2Na + Cl₂ → 2NaCl, what are the reactants?

Back

The reactants are 2Na (sodium) and Cl₂ (chlorine gas).

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.