Metal & Non-metal Oxides

Question 1

metal + oxygen →

Answer 1

metal oxide

Question 2

4Li + O₂ → 2Li₂O , what is the color of the flame?

Answer 2

red

Question 3

metaloxide + water →

Answer 3

metal hydroxide

Question 4

If UI was added to LiOH, what color would it turn?

Answer 4

purple (strong base)

Question 5

2Mg + O₂ → 2MgO , what color is the flame?

Answer 5

white

Question 6

what color are group 2 compounds?

Answer 6

white (s)

Question 6

Mg(OH)₂ is a WHITE SUSPENSION, if UI was added, what color would it turn?

Answer 6

blue (weak base) because fewer hydroxide ions dissolved

Question 6

2Ca + O₂ → 2CaO , what color is the flame?

Answer 6

brick-red

Question 7

CaO + H₂O → Ca(OH)₂ , what color does it turn with UI?

Answer 7

blue

Question 8

4Al + 3O₂ → 2Al₂O₃ , what color is the flame?

Answer 8

orange

Question 9

Al₂O₃ + H₂O doesn’t react, this means it is…

Answer 9

amphoteric

Question 10

define amphoteric

Answer 10

A substance that can act either as an acid or a base

Question 11

What color is Fe₂O₃?

Answer 11

orange/brown (s)

Question 12

Even though Fe₂O₃ is a base, why would the UI show a pH 7?

Answer 12

because indicators can only measure pH for (aq) solutions

Question 13

Is ZnO amphoteric?

Answer 13

yes

Question 14

Why do non-metals react with oxygen?

Answer 14

to form covalent oxides

Question 15

What structure is most common for non-metal oxides?

Answer 15

discrete

Question 16

What are the properties of non-metal oxides?

Answer 16

• low mpt
• soluble in oil-like substances
• do not conduct

Question 17

non-metal oxide + water →

Answer 17

acid

Question 18

4P + 5O₂ → 2P₂O₅

what color is the flame and what happens?

Answer 18

white flame, spontaneously combusts

Question 19

P₂O₅ + 3H₂O → 2H₃PO₄

this is…

Answer 19

exothermic

Question 20

what pH is carbonic acid?

Answer 20

pH5, yellow, weak acid

Question 21

Is SiO₂ amphoteric?

Answer 21

yes

Question 22

H₂SO₃

Answer 22

sulfurous acid

Question 23

H₂SO₄

Answer 23

sulfuric acid

Question 24

Air is consisting of…

Answer 24

78% Nitrogen
21% Oxygen
0.03% Carbon Dioxide
0.97% Argon