Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products).

Front

What are reactants in a chemical equation?

Back

The starting substances that undergo change during a chemical reaction, found on the left side of the equation.

Front

What are products in a chemical equation?

Back

The new substances formed as a result of a chemical reaction, found on the right side of the equation.

Front

What does the coefficient in a chemical formula indicate?

Back

The number of molecules of a substance involved in the reaction.

Front

What is the law of conservation of mass?

Back

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

Front

What is an example of a physical change?

Back

Melting ice is a physical change because it does not alter the chemical composition of water.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change because it produces new substances like ash and smoke.

Front

What is a catalyst?

Back

A substance that speeds up a chemical reaction without being consumed in the process.

Front

What is an exothermic reaction?

Back

A reaction that releases energy, usually in the form of heat.

Front

What is an endothermic reaction?

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A reaction that absorbs energy from its surroundings.