C3.1

Question 1

what is the conservation of atoms and mass?

Answer 1

-during a chemical reaction atoms cannot be created or destroyed, they are just rearranged
-so the same type and number of atoms we started with in the reactants must also all be present in the products
-mass is also conserved during this reaction

Question 2

what is the aim of ionic formula?

Answer 2

to cancel out the charges on ions

Question 3

how is ionic formula writted?

Answer 3

empirical formula which shows the simplest whole number ratio of ions

Question 4

what are redox reactions?

Answer 4

the movement of electrons between atoms

Question 5

equation for number of moles in an element

Answer 5

number of moles = mass / molar mass

Question 6

aqueous

Answer 6

in solution or dissolved in water

Question 7

what substances are always aqueous?

Answer 7

acids and alkalis

Question 8

sulfate ion

Answer 8

SO4 2-

Question 9

nitrate ion

Answer 9

NO3 -

Question 10

carbonate ion

Answer 10

CO3 2-

Question 11

hydroxide ion

Answer 11

OH-

Question 12

ammonium ion

Answer 12

NH4 +

Question 13

phosphate ion

Answer 13

PO4 3-

Question 14

what does OIL RIG stand for?

Answer 14

Oxidation
Is
Loss

Reduction
Is
Gain

Question 15

what are half equations?

Answer 15

they represent the loss or gain of electrons during the formation of a particular ion

Question 16

what is reduction in terms of oxygen?

Answer 16

when you lose oxygen

Question 17

what is oxidation in terms of oxygen?

Answer 17

when you gain oxygen

Question 18

precipitation

Answer 18

a type of reaction in which a precipitate forms

Question 19

precipitate

Answer 19

an insoluble product in the solid state, formed during a reaction involving solutions

Question 20

Avogadro’s constant

Answer 20

6.02 x 10^23

Question 21

molar mass =

Answer 21

relative atomic mass of an element