Metal oxides

Question 1

Lithium + oxygen ——-> Lithium oxide
colour and state change?

Answer 1

4Li + O₂ ——–> 2Li₂O
Grey (s) + colourless (g) ——-> white (s)
(red flame)

Question 2

Metal oxide + water = ?

Answer 2

metal hydroxide

Question 3

metal + oxygen = ?

Answer 3

metal oxide

Question 4

Lithium oxide + water ——> Lithium hydroxide
colour change?

Answer 4

Li₂O + H₂O —-> 2LiOH
white (s) + colourless (l) ——> colourless (aq)

Question 5

What colour does lithium oxide turn when you add UI and what does it mean?

Answer 5

Purple. It is a strong base, has a pH of above 7, and is not acidic.

Question 6

Magnesium + oxygen —-> Magnesium oxide
colour change?

Answer 6

2Mg + O₂ —–> 2MgO
Grey (s) + colourless (g) ——-> white (s)
white flame

Question 7

Magnesium oxide + water —–> Magnesium hydroxide
state change?

Answer 7

MgO + H₂O —–> Mg(OH)₂
White (s) + colourless (l) ——> white suspension (did not dissolve)

Question 8

Metal oxides produce oxides that turn litmus paper ___ when dissolved indicating ___

Answer 8

Blue, they are base

Question 9

All the gp. 1 metals that we need to know, and what is their common state and colour?

Answer 9

Li, Mg, Ca, Al, Fe
grey solids

Question 10

All oxides except 1 are white solids. Which one is not, and what is its colour?

Answer 10

Fe₂O₃
It is an orange/brown solid

Question 11

Lithium flame colour with oxygen?
solution with litmus paper?

Answer 11

Red
dissolves, turns blue

Question 12

Magnesium flame colour with oxygen?
solution with litmus paper?

Answer 12

White
dissolves partially, turns blue

Question 13

Calcium flame colour with oxygen?
solution with litmus paper?

Answer 13

Brick-red
dissolves, turns blue

Question 14

Aluminium flame colour with oxygen?
solution with litmus paper?

Answer 14

White
Insoluble, does not react with water and therefore does not form metal hydroxide

Question 15

Iron flame colour with oxygen?
solution with litmus paper?

Answer 15

Orange
Insoluble, does not react with water and therefore does not form metal hydroxide

Question 16

Calcium + oxygen –> Calcium oxide
State change?

Answer 16

Ca + O₂ –> CaO
grey (s) + colourless (g) –> white (s)

Question 17

Calcium oxide + water –> calcium hydroxide
Response with UI?

Answer 17

CaO + H₂O –> Ca(OH)₂
Blue, because a suspension, fewer hydroxide ions dissolved

Question 18

Aluminium + oxygen –> aluminium oxide
State change?

Answer 18

Al + O₂ –> Al₂O₃

Question 19

Iron + oxygen –> iron oxide
state change?
What charge is the iron ion?

Answer 19

Fe + O₂ –> Fe₂O₃
Grey (s) + colourless (g) –> orange/brown (s)
Iron III oxide (3⁺)