Theory

Question 1

A
X
Z

Answer 1

X - Chemical symbol of element
Z - Atomic number
A - Mass number

Question 2

Mass number

Answer 2

Neutrons + Protons

Question 3

Atomic number

Answer 3

equal to number of protons in nucleus / or number of electrons in electrically neutral atom

Question 4

Electrons

Answer 4

1. negatively charged subatomic particles
2. same number as protons / atomic number
3. charge = -1, relative mass = 1/2000

Question 5

Protons

Answer 5

1. positively charged subatomic particles in nucleus
2. same number of electrons / atomic number
3. charge = +1, relative mass = 1

Question 6

Neutron

Answer 6

1. neutral charged subatomic particle in nucleus
2. mass number - atomic number
3. charge = 0, relative mass = 1

Question 7

Electron Configuration

Answer 7

2, 8, 8, 2

Question 8

Isotopes

Answer 8

atom that have same atomic number but different mass number

Question 9

Ionic compound

Answer 9

1. when positive cation and negative anion attract each other forming a crystal lattice

Question 10

Balance of Ionic compounds

Answer 10

Must balance overall charges and show rations between the ions

-> eg. Al Cl
2 3

Question 11

Positive ion

Answer 11

cation, formed when metal atom loses electrons

Question 12

Negative ion

Answer 12

anion, formed when non-metal atom gains electrons

Question 13

Law of Conversation of Mass

Answer 13

atoms are neither created nor destroyed during a chemical reaction, they only change the way in which they are arranged

Question 14

Reactants

Answer 14

substance that takes part in and undergoes change during a reaction

Question 15

Products

Answer 15

substances produced at the end of the reaction