Honors Chemistry Final Review Part 2

Front

What is the formula to calculate the number of oxygen atoms in a compound?

Back

To find the number of oxygen atoms in a compound, multiply the number of oxygen atoms in the formula by the coefficient in front of the formula.

Front

How many oxygen atoms are in Pb(C₂O₄)₂?

Back

There are 8 oxygen atoms in Pb(C₂O₄)₂ because there are 4 oxygen atoms in each C₂O₄ group and there are 2 groups.

Front

What is the molar mass of magnesium (Mg)?

Back

The molar mass of magnesium is approximately 24.3 g/mol.

Front

How do you find the mass of a different element that contains the same number of atoms as a given mass of another element?

Back

Use the molar mass of both elements to set up a proportion based on the number of moles.

Front

What is the Law of Definite Proportions?

Back

The Law of Definite Proportions states that a chemical compound always contains its component elements in fixed ratio by mass.

Front

What is the molar mass of ammonium phosphate (NH₄)₃PO₄?

Back

The molar mass of (NH₄)₃PO₄ is approximately 149.09 g/mol.

Front

How do you calculate the mass of a substance from moles?

Back

Mass (g) = Moles × Molar Mass (g/mol).

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical or physical means.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.