Formula And Reactig Quantities N5 U1 P4

Question 1

Naming compounds - potassium sulphate

Answer 1

Potassium, sulphur and oxygen

Question 2

Counting atoms baic rules

Answer 2

Number at the start of the formula multiply by any small number infront of an element
Elements in a bracket are multiplied by the small number next the the end bracket
Elements in a bracket, one has a number in the bracket, this number is multiplied by the number next to the end bracket

Question 3

Counting atoms- prefixes

Answer 3

Prefixes tell us the number of atoms without using SVSDF

Question 4

Chemical formula-SVSDF- silicon oxide

Answer 4

Symbol- Si O
Valency- 4 2
Swap- 2 4
Divide- 1 2
Formula- SiO2

Question 5

Chemical formula- Roman numerals

Answer 5

Valency for SVSDF

Question 6

Ionic formula

Answer 6

The charge on an element tells us the valency for SVSDF

Question 7

State symbols [s] [l] [aq] [g]

Answer 7

S- solid
L- liquid
Aq- aqueous [solution]
G- gas

Question 8

Group ions

Answer 8

Ion containing more than one type of atom

Question 9

Gram Formula Mass

Answer 9

Calculated by multiplying RAM by number of atoms for both elements
Two masses added

Question 10

Calculations

Answer 10

m n
n I gfm. c I v

Question 11

Steps calculations from balanced equations

Answer 11

Identify substances
Identify mole ratio
Change moles to mass
Calculate unknown using proportion

Question 12

Steppes percentage composition

Answer 12

% by mass= m over GFM multiply by 100
Calculate gfm
Calculate percentage