Chemical Reactions

Front

What is a chemical reaction?

Back

A process in which one or more substances are converted into new substances with different properties.

Front

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

Back

In a chemical change, a new substance is formed, while in a physical change, no new substance is formed.

Front

What are some common signs that a chemical change has occurred?

Back

Signs include color change, gas production (bubbling), temperature change, and formation of a precipitate.

Front

What is the word equation for cellular respiration?

Back

Glucose + Oxygen → Water + Carbon Dioxide + Energy.

Front

How many hydrogen atoms are typically found in a water molecule?

Back

2.

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 in a chemical reaction?

Back

A substance that is present at the start of a chemical reaction and is consumed during the reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.

Front

How can you determine the number of atoms of an element in a chemical formula?

Back

By looking at the subscript next to the element's symbol in the formula.

Front

What is a balanced chemical equation?

Back

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