Ch3 Compounds, formulae and equations

Question 1

Valency

Answer 1

number of electrons that an atom gains, loses or shares during chemical reaction

Question 2

5 elements/ group with valency +1

Answer 2

group 1 elements
hydrogen H
silver Ag
ammonium NH4
copper Cu

Question 3

5 elements/ group with valency +2

Answer 3

group 2 elements
Iron Fe
Copper Cu
Zinc Zn
Lead Pb

Question 4

elements/ group with valency +3

Answer 4

Group 13 elements
Iron Fe

Question 5

elements/ group with valency +4

Answer 5

Lead Pb

Question 6

4 elements/ group with valency -1

Answer 6

Group 17 elements
Hydroxide OH
Nitrate NO3
Hydrogencarbonate HCO3

Question 7

elements/ group with valency -2

Answer 7

Oxygen O
Sulfur S
Sulfate SO4
Carbonate CO3

Question 8

Aq

Answer 8

Indicates an ionic substance and ions are mobile and separate

Question 9

G

Answer 9

Gas which is usually covalent

Question 10

S

Answer 10

solid in which particles are not mobile

Question 11

l

Answer 11

indicates liquid which is usually covalent

Question 12

soluble

Answer 12

substance which is able to be dissolved

Question 13

insoluble

Answer 13

substance which isn’t able to be dissolved

Question 14

solvent

Answer 14

substance which is able to dissolve other substances(solute)

Question 15

solute

Answer 15

minor component in solution
is dissolved in solvent