chapter 11-chemical changes

Question 1

what is the rusting of iron nails

Answer 1

oxidation

Question 2

what is carbon dioxide and water reacting in the presence of light to form glucose and oxygen

Answer 2

photosynthesis

Question 3

what is the coating of an iron tap with chronium metal?

Answer 3

electrocoating

Question 4

what is the burning of petroleum in a car engine

Answer 4

combustion

Question 5

what is calcium carbonate breaking down into calcium oxide and carbon dioxide upon heating?

Answer 5

thermal decomposition

Question 6

acid + alkali -> ?

Answer 6

neutralisation
salt + water

Question 7

acid + metal -> ?

Answer 7

salt + hydrogen

Question 8

acid + carbonate -> ?

Answer 8

salt + water + carbon dioxide
s + h20 + Co2

Question 9

sulfuric acid + calcium carbonate-> ?

Answer 9

calcium sulfate+ water + carbon dioxide

Question 10

nitric acid + magnesium carbonate-> ?

Answer 10

magnesium nitrate + water + carbon dioxide

Question 11

how does one test for hydrogen?

Answer 11

place a lighted splint near the mouth of the testube. it will extinguish with a “pop” sound if hydrogen is present.

Question 12

how does one test for carbon dioxide?

Answer 12

bubble the gas into lime water, a white precipitate will form if carbon dioxide is present