7th - Counting Atoms, Classifying and Balancing Equations

Front

What is the law of conservation of mass?

Back

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

Front

How do you determine the number of atoms in a molecule?

Back

Count the subscripts in the chemical formula. If there is no subscript, it is assumed to be 1.

Front

What is a balanced chemical equation?

Back

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

Front

What does a coefficient in a chemical equation represent?

Back

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

Front

What are reactants in a chemical equation?

Back

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

Front

What are products in a chemical equation?

Back

Substances formed as a result of a chemical reaction, found on the right side of the equation.

Front

What is a subscript in a chemical formula?

Back

A small number written to the right of a chemical symbol indicating the number of atoms of that element in a molecule.

Front

How many atoms are in the molecule C6H12O6?

Back

24 atoms (6 Carbon, 12 Hydrogen, 6 Oxygen).

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What does it mean for a chemical equation to be unbalanced?

Back

The number of atoms of at least one element is different on the reactant side compared to the product side.