Chemical reactions review

Front

What is a chemical reaction?

Back

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

Front

What are the signs that a chemical reaction has occurred?

Back

Evidence includes a precipitate forming, color change, temperature change, gas production, and light emission.

Front

What is a precipitate?

Back

A solid that forms when two liquids react with each other.

Front

What does it mean if a reaction is exothermic?

Back

It means the reaction releases heat to the surroundings.

Front

What does it mean if a reaction is endothermic?

Back

It means the reaction absorbs heat from the surroundings.

Front

What is a balanced chemical equation?

Back

An equation where the number of atoms for each element is the same on both sides.

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 gases.

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst speeds up a reaction without being consumed in the process.