Atomic History and Balancing Equations

Front

What part of an atom is used to identify it?

Back

Number of protons.

Front

What are the items in blue in a chemical equation?

Back

Products.

Front

Is the equation 2H2 + O2 → 2H2O balanced or unbalanced?

Back

Balanced.

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Front

Who proposed the Bohr model of the atom?

Back

Neils Bohr.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules are involved.

Front

What is a subscript in a chemical formula?

Back

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

Front

What is the difference between reactants and products in a chemical reaction?

Back

Reactants are substances that start a chemical reaction, while products are substances formed as a result of the reaction.

Front

What is an unbalanced equation?

Back

An equation where the number of atoms of each element is not the same on both sides.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number and identity of an element.