Chemistry - Atomic structure/Average Atomic mass/Molar mass: Quiz study guide

Fleeher p6

What is mass number?

# of protons + # of neutrons

How to calculate number of neutrons?

Mass # - protons

How to find number of protons?

Equal to the atomic number

How do you calculate charge?

Protons - electrons

How do you calculate electrons?

Neutral: Equal to atomic number

Ion: Protons - charge

What is a nuclear symbol?

Mass # Charge

Element

symbol

Atomic #

What is hyphen notation?

Element name - mass # w/a ____ charge

What is average atomic mass?

The weighted average mass of all atoms of an element, based on the abundance of the isotopes

How to calculate average atomic mass

(Mass # of isotope 1)(Percent as a decimal) + (Mass # of isotope 2)(Percent as a decimal)

What is the correct unit for average atomic mass?

amu

What is molar mass?

The mass of one mole of a substance

How to calculate molar mass (ex)

1 mol of Mg = 1 × 24.31 = 24.31

2 mol of O = 2×16 = 32

2 mol of H = 2 × 1.01 = 2.02

= 58.33 g/mol

What is the correct unit for the molar mass?

g/mol

What is Avagadro’s number?

6.02 X 10²³

What is a mole?

A chemist’s “counting” unit or the SI unit for the amount of substance

What is isotope notation?

The complete nuclear symbol without the charge

What is the symbol for the unit mole

Mol

What are isotopes?

Different versions of an element or different versions of a certain kind of atom

What do isotopes have in common?

The atomic number/the number of protons

What was Avagadro’s theory?

If you have equal volumes of gases at the same temperature and pressure, they would contain an equal number of particles