C3.1

Question 1

Molecular formulae

Answer 1

Used for simple covalent compounds

Question 2

Empirical formulae

Answer 2

Used for ionic and giant metallic lattices

Question 3

Diatomic

Answer 3

When two atoms are joined together they are said to be diatomic

Question 4

Examples of the diatomic elements

Answer 4

oxygen

nitrogen

hydrogen

fluorine

iodine

bromine

chlorine

Question 5

Ex: magnesium + iron nitrate -> magnesium nitrate +iron

Answer 5

Magnesium nitrate +iron

Question 6

Name the + ions

Answer 6

H+, Na+, Li+, Ag+, NH4+, K+

Question 7

Name the 2+ ions

Answer 7

Ba2+, Ca2+, Cu2+, Fe2+, Mg2+, Zn2+, Pb2+

Question 8

Name the 3+ ions

Answer 8

Fe3+, Al3+

Question 9

Name the - ions

Answer 9

Cl-, Br-, F-, I-, OH-, NO3-

Question 10

Name the 2- ions

Answer 10

O2-, S2-, SO4 2-, CO3 2-

Question 11

Calcium nitrate

Answer 11

Ca(NO3)2

Question 12

Lithium sulfate

Answer 12

Li2SO4

Question 13

During a chemical reaction

Answer 13

The total masses stay the same before and after

Question 14

Matter…

Answer 14

Cannot be created or destroyed

Question 15

Oxidation is

Answer 15

Loss

Question 16

Reduction is

Answer 16

Gain

Question 17

What is an ionic compound?

Answer 17

Anything bonded to a nitrate

Question 18

When ions are free to move

Answer 18

They can collide into different ions

Question 19

What is an aqueous solution?

Answer 19

A solution containing a substance that is dissolved in water

Question 20

When ions that are dissolved collide and react…

Answer 20

A precipitate forms

Question 21

Fast or slow reaction?

Answer 21

Fast

Question 22

Equation for moles

Answer 22

moles = mass/relative mass

Question 23

What is a mole?

Answer 23

One mole of a substance is equal to 6.022 × 10²³ units of that substance

Question 24

When you have the mass and need the amount of moles

Answer 24

Divide by the molar mass

Question 25

When you have the amount of moles and need the mass

Answer 25

Multiply by the molar mass

Question 26

When you have the moles and need the number of particles

Answer 26

Multiply by 6.02*10^23

Question 27

When you have the number of particles and need moles

Answer 27

Divide by 6.02*10^23

Question 28

What is Avogadro’s constant?

Answer 28

6.02*10^23

Question 29

What does the Law of Conservation of Mass state?

Answer 29

• No atoms are made or lost during a reaction
• The mass of the reactants will be the same as the mass of the reactants after a reaction