Chemical Quantities Review

Front

What is a chemical formula?

Back

A chemical formula uses chemical symbols to represent the atoms of the elements and their ratios in a chemical compound.

Front

If you have one mole of solid tin (Sn), how many moles do you have if you double this amount?

Back

Two moles of Sn.

Front

What is the percent composition of Nitrogen in NO₂? (rounded)

Back

30%.

Front

How do you calculate the molar mass for C₄H₆?

Back

4(12.0111) + 6(1.00794).

Front

What is the empirical formula for Pb₅Cr₅O₂₀?

Back

PbCrO₄.

Front

Define 'mole' in chemistry.

Back

A mole is a unit of measurement that represents 6.022 x 10²³ particles (atoms, molecules, etc.) of a substance.

Front

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

Back

The coefficient indicates the number of moles of a substance involved in a reaction.

Front

What is the difference between empirical and molecular formulas?

Back

The empirical formula shows the simplest whole-number ratio of elements in a compound, while the molecular formula shows the actual number of atoms of each element in a molecule.

Front

How do you find the molar mass of a compound?

Back

Add the atomic masses of all the atoms in the compound's formula.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in a molecule.