Reactions of metals with oxygen &H2O & acids

Question 1

word equation of reactions of metals with acids

Answer 1

metal + acid -> salt + hydrogen

Question 2

word equation of reactions of metals with cold water

Answer 2

metal + cold water
-> metal hydroxide + hydrogen

Question 3

word equation of reactions of metals with steam

Answer 3

metal + steam
-> metal oxide + hydrogen

Question 4

word equation of reactions of metals with oxygen

Answer 4

metal + oxygen -> metal oxide

Question 5

metals that burn when reacting with oxygen

Answer 5

K,Na ,Ca, Mg, Al, Zn, Fe

Question 6

metals that have no reaction when reacting with oxygen

Answer 6

Ag, Pt, Au

Question 7

metals that do not burn and form oxide only when reacting with oxygen

Answer 7

Pb, Cu, Hg

Question 8

metals that react with cold water

Answer 8

K, Na, Ca

Question 9

metals that can react with steam but not cold water

Answer 9

Mg, Al, Zn, Fe

*Mg can react with steam and hot water

Question 10

metals that do not react with cold water or steam

Answer 10

Pb, Cu, Hg, Ag, Pt, Au

Question 11

Metals that react explosively with acids

Answer 11

K, Na

Question 12

Metals that react with acids not explosively

Answer 12

Ca, Mg, Al, Zn, Fe, Pb

Question 13

Metals that do not react with acids

Answer 13

Cu, Hg, Ag, Pt, Au

Question 14

observations of the reaction of Ca with cold water

Answer 14

1. Ca sinks
2. colorless gas bubbles are evolved
3. a milky solution is formed

Question 15

observations of the reaction of K or Na react with cold water

Answer 15

1. burns with (K) a lilac flame / (Na) golden yellow flame
2. floats
3. moving quickly on the water surface
4. then dissolves
5. while fume is produced

Question 16

observations of Mg react with steam

Answer 16

1. produce a bright white light
2. a white solid is formed

Question 17

What do lead react with?
(oxygen, cold water, steam , acid )

Answer 17

oxygen, acid

Question 18

Observation of the reaction of Al and O

Answer 18

-burns with a white flame
-white powder is formed

Question 19

Observation of the reaction of Zn and O

Answer 19

-burns with a white-blue flame
-power which is white when cold, yellow when hot

Question 20

Observation of the reaction of Fe and O

Answer 20

• burns with yellow sparks
• black powder is formed

Question 21

What is the state of Hg in room temperature ?

Answer 21

Liquid

Question 22

Can Mg reacts with hot water ?

Answer 22

Yes. Mg sinks to the bottom of water. Colorless gas bubbles evolved. (A milky solution might formed)

Question 23

Observation of the reaction of Mg react with steam

Answer 23

• glows
• white powder is formed

Question 24

Observation of the reaction of K and cold water

Answer 24

• burns with lilac flame
• floats on water surface
• moves quickly on the water surface
• melts
• hissing sound

Question 25

Observation of the reaction of Ca and HCl(aq)

Answer 25

• Metal dissolves
• Colourless gas bubbles are evolved
• A colorles solution is formed

Question 26

Observation of the reaction of Ca and H2SO4(aq)

Answer 26

• Colorless gas bubbles are evolved for a short period of time only.
  Because the insoluble CaSO4(s) layer prevents Ca(s)from further reacts with H2SO4

Question 27

Observation of the reaction of Fe and HCl(aq) or H2SO4(aq)

Answer 27

-Metal dissolves
-a pale green solution is formed
-Colorless gas bubbles are evolved

• the product is iron (II) chloride or iron (II) sulphate

Question 28

PbCl, PbSO4

Answer 28

insoluble