chap 4 booklet

Question 1

Groupon 1 elements

Answer 1

Always +1 in compounds

Question 2

Group 2 elements

Answer 2

always +2 in compounds

Question 3

F

Answer 3

-1

Question 4

H

Answer 4

+1 except in metal hydrides eg NaH,MgH2 where H is -1

Question 5

O

Answer 5

-2 except in peroxides (H2O2) ,where O is -1, and OF2 where O is + 2

Question 6

Cl

Answer 6

-1 except when combined with O or F

Question 7

The oxidation number is always 0 for elements….?

Answer 7

in elemental form or as diatomic with no charge basically not combined with anything

Question 8

Monatomic ions have oxidation numbers equal to?

Answer 8

There charge

eg Mg^+2 = +2

Question 9

The sum of the oxidation numbers in a neutral compound equals?

Answer 9

zero
H2O = 0 (2*+1)+(-2)

Question 10

The sum of the oxidation numbers in a polyatomic ion equals the?

Answer 10

charge on the ion

SO4^-2 (4*-2)+6 = -2

Question 11

Write the name MnO4^- including Roman numerals

Answer 11

Manganese(Vll) in permanganate ion

Question 12

names of HNO3 and CH3COOH respectively

Answer 12

Nitric acid and ethanoic acid