Unit Review: Chemical Interactions

Front

What happens to the space between particles when a substance is heated?

Back

The space between the particles increases.

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into different substances (products) with different properties.

Front

What evidence indicates a chemical reaction has occurred?

Back

The products include different substances than the reactants.

Front

What is kinetic energy?

Back

The energy that an object possesses due to its motion.

Front

What happens to sugar when it melts?

Back

The kinetic energy of the sugar particles increases, allowing them to move past one another.

Front

What occurs when sugar dissolves in water?

Back

Liquid particles break sugar particles apart from one another.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen is a reactant that combines with a fuel to produce heat, light, carbon dioxide, and water.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is a reactant?

Back

A substance that undergoes a chemical change in a reaction.