Chem Chapter 1

Question 1

Three parts of the nuclear series

Answer 1

1. Most of the atom’s mass and all its positive charge are contained in a small core called a nucleus
2. Due to electrons being spaced out within the cloud, most of the volume of an atom is just empty space
3. There are as many negatively charged electrons outside the nucleus as there are positively charged particles within the nucleus. The atom is overall neutral

Question 2

An atom is the smallest particle of an element that…

Answer 2

retains the chemical properties of that element

Question 3

An atom with the same number of protons but a different number of neutrons is called

Answer 3

an isotope

Question 4

The mass number is written after the element name or symbol, separated by a hyphen

Answer 4

Hyphen notation

Question 5

Atoms of an element that has an average atomic mass; sum of the average atomic masses for each atom

Answer 5

Molecular Mass

Question 6

How to find the molecular mass of gold?

Answer 6

196.97amu(atomic mass)(1.6605410^-27/1amu)(1000g/1kg) = 3.270810^-22grams

Question 7

Amount of a substance that contains avogadros number

Answer 7

1 mole

Question 8

Know how to convert between base units

Answer 8

notes

Question 9

Molar mass

Answer 9

amount of grams per 1 mole

Question 10

How many moles are in 2.75g of Fe?

Answer 10

2.75g of Fe(1mol/55.845g) = 4.92*10^-2molFe

Question 11

How many atoms are in 0.621g of K?

Answer 11

0.621g of (1mol/39.098)(6.02210^23atom/1mol) = 9.5610^21 atoms of K

Question 12

How many grams in 7.42*10^-1 mols CO2?

Answer 12

7.42*10^-1(44.01g/1mol) = 32.7g CO2

Question 13

How many grams in 8.5*10^21 molecules CH4?

Answer 13

8.510^21molecules(1mol/6.02210^23moles)(16.04g/1mol) = 0.23g of CH4