Moles Review

Front

What is the empirical formula?

Back

The empirical formula is the simplest whole-number ratio of the elements in a compound.

Front

How do you calculate the empirical formula from percentages?

Back

Convert the percentages to grams, then to moles, and find the simplest ratio of moles.

Front

What is the molecular formula?

Back

The molecular formula shows the actual number of atoms of each element in a molecule.

Front

How do you convert grams to moles?

Back

Use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, representing the number of particles in one mole.

Front

How do you find the number of molecules in a given mass?

Back

Convert the mass to moles, then multiply by Avogadro's number.

Front

What is standard notation?

Back

Standard notation is the way of writing numbers using digits, as opposed to scientific notation.

Front

How do you convert scientific notation to standard notation?

Back

Move the decimal point to the right for positive exponents and to the left for negative exponents.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

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

Back

Multiply the number of molecules by the subscripts of each element in the formula.