Chapter 5

Question 1

What is the law of conservation of mass?

Answer 1

Total mass of chemicals before and after a reaction stays the same.

Question 2

What is the law of conservation of energy?

Answer 2

Whenever a chemical reaction takes in energy or releases energy, there is no overall change in the amount of energy during the reaction.

Question 3

List all 13 elements of the reactivity series from most reactive to least reactive.

Answer 3

Potassium, Sodium, Lithium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Hydrogen, Copper, Silver, Gold

Question 4

List 2 displacement reactions used in the industry.

Answer 4

thermite reaction, extracting metal from ore

Question 5

How do you test for hydrogen, oxygen and carbon dioxide?

Answer 5

Hydrogen: Use a lit splint, it will make a pop sound
Oxygen: Use a glowing splint, it will relight
Carbon dioxide: Use limewater, it will become cloudy

Question 6

acid+________ → ______+water

Answer 6

base/alkali, salt

Question 7

metal + acid→ ?

Answer 7

salt+hydrogen

Question 8

metal oxide+ acid→

Answer 8

salt+ water

Question 9

metal carbonate + acid→

Answer 9

salt+ water+ carbon dioxide

Question 10

acid+alkali?

Answer 10

salt+water