Chemical formulae

Question 1

What does a formula tell us? for example, what do we know from the formula SO2

Answer 1

A covalent molecular compound formula gives the number of atoms present in a single element
SO2 (one sulfur, two oxygen)

Question 2

prefix for “one” to name covalent compound

Answer 2

mono

Question 3

prefix for “two” to name covalent compound

Answer 3

di

Question 4

prefix for “three” to name covalent compound

Answer 4

tri

Question 5

prefix for “four” to name covalent compound

Answer 5

tetra

Question 6

prefix for “five” to name covalent compound

Answer 6

penta

Question 7

prefix for “six” to name covalent compound

Answer 7

hexa

Question 8

prefix for “seven” to name covalent compound

Answer 8

hepta

Question 9

prefix for “eight” to name covalent compound

Answer 9

octa

Question 10

What is a valency?

Answer 10

It’s the number of electrons gained or lost

Question 11

SVSDF method is for which type of compounds?

Answer 11

Symbols
Valency
Swap
Divide
Formula

For ionic compound (metals and non-metals)

Question 12

What happens when a formula contains more than one group ion , for example NO3

Answer 12

The group ion must be written in brackets

Mg(NO3)2

Question 13

Roman numeral for 4

Answer 13

IV

Question 14

Roman numeral for 3

Answer 14

III

Question 15

Roman numeral for 6

Answer 15

VII

Question 16

Roman numeral for 1

Answer 16

I

Question 17

Roman numeral for 5

Answer 17

V

Question 18

Roman numeral for 2

Answer 18

II

Question 19

What is the fomula for Calcium iodide

Answer 19

CaI2

Question 20

How to work out mole calculations

Answer 20

Mole n = Mass(g)

GFM

Question 21

How to work out mole calculations involving solutions

Answer 21

Mole n=Concentration mol 1

Volume (litres)

Question 22

Write the formula for tetracarbon pentafluoride

Answer 22

C4F5

Question 23

What is the formula for Ammonium Phosphate

Answer 23

(NH4)3PO4

Question 24

What is the GFM of Calcium Chloride

Answer 24

CaCl2 = 40 + 35.5x2 = 111