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 a molecule?

Back

A group of two or more atoms bonded together.

Front

How do you determine the number of atoms in a chemical formula?

Back

By counting the subscripts in the formula; if no subscript is present, it is understood to be one.

Front

What is the significance of the coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles 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; the total mass of reactants equals the total mass of products.

Front

What is a reactant?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product?

Back

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

Front

How many hydrogen atoms are in the chemical formula C₆H₁₂O₆?

Back

There are 12 hydrogen atoms.

Front

What does the subscript in a chemical formula represent?

Back

The number of atoms of the element in one molecule of the compound.

Front

What is dry ice and what happens to it when heated?

Back

Dry ice is solid carbon dioxide (CO₂) that sublimates directly into gas when heated.