Topic 1

Question 1

Element

Answer 1

Elements are substances made from one kind of ato m

Question 2

Relative formula mass

Answer 2

Adding RAM of all atoms/ions

Question 3

Homogeneous vs heterogeneous Mixtures

Answer 3

Homogeneous
-Uniform composition, properties and particle distribution (e.g air)

heterogeneous
-non-uniform composition properties and particle distribution (eg mil and cereal) Visbly differnent

Question 4

Relative atomic mass

Answer 4

Average mass of one atom of an element compared to C-12

Question 5

MR triangle

Answer 5

moles= Mass/Mr

Question 6

Formula unit

Answer 6

Formula unit =avagadros number X mole

Question 7

Formula Unit??

Answer 7

the type of particle present in a sumbstance

Question 8

Emeperical vs molecular formula

Answer 8

Molecular formula : the no of atoms of each element in a molecule

Emperical formula; The simplesy whole no ratios of atoms

Question 9

emperical formula steps

Answer 9

Find mass of each element
Find moles of each element by doing mass/mr
Divide each mole value buy the smallets mole vallue
apply

Question 10

calculating Molecular formula

Answer 10

Molar mass of molecule/ empirical formula mass

Question 11

Diatomic molecules

Answer 11

o2 F2 I2 N2 Cl2 H2 Br2
Have no fear of ice cold beer

Question 12

Concentration triangle

Answer 12

moles=molar conc x volume

Question 13

Dilution equation

Answer 13

C1V1=C2V2

Intial conc and volume = Diluted conc and volume

Question 14

Limited reagent Excess reagent

Answer 14

limiting reagent compleyely used up during the reaction

Excess reagent = there are some left overs after the reaction

Question 15

Formula of hydrate

Answer 15

Find the mass of h20 in the hydrate by calculating mass of hydrate- mass of hydrate after evaporation
2 determine the moles of salt and h20 using g and gmole-1
3 Find a whole number mole ratio by dividng both moles by the smallest mole value
4 Ratio shows X

Question 16

Solute vs solvent

Answer 16

Solute- What you put
Solvent- where it went

Question 17

Ideal gas

Answer 17

Pv=NRT

Question 18

units of pressure

Answer 18

pascals (pa)
Atmospheres (atm)
1atm=101 kpa

Question 19

Avogadros law

Answer 19

Equal volumes of different gases at the same temp and pressure will contain the same no of particles

Question 20

Boyles Law

Answer 20

P1 v1 = p2 v2
constant tempertaure

p is inversly porportional to V

Question 21

Charles Law

Answer 21

V1/t1=v2/t2

V is porportional to T

Question 22

gay law

Answer 22

p1/t1 = P2/t2

pressure is porportional to t

Question 23

Combined gas law

Answer 23

P1v1/t1 = P2V2/t2

Question 24

Molar volume

Answer 24

The volume occupied by 1 mol of an ideal gas under specific temp and pressure condiditon

Question 25

Relation ship n v mv

Answer 25

Volume = n x mv

Question 26

Group ions

Answer 26

So42-
Nh4+
Oh-
No3-
Co22-
So3 2-
Po4 3-
mno4 -
Hco3-

Question 27

Percentage purity

Answer 27

Mass of pure substance / mass of given smaples x 100

Question 28

percentage yield

Answer 28

Actual yield / theorectical yield x 100

Question 29

Percentage difference

Answer 29

actual mass- theoretical mass/ theoretical mass x 100

Question 30

% compostion

Answer 30

Ram of element x no of atoms / molar mass of compound x 100