( 15. Write equations to show how carbon dioxide reacts with
Sodium hydroxide solution and state what would be
observed. (1 mark)
16. Name one process in each case by which the concentration
of carbon (IV) oxide in the atmosphere is
(a) Increased. (1 mark)
(b) Decreased. (1 mark)
21.1
2
17. (a) What is amorphous carbon. (1 mark)
(b) Give examples of amorphous carbon. (2 marks)
(C) State three uses of amorphous carbon. (3 marks)
18. (a) State three physical properties of carbon (IV) oxide.
(3 marks)
(b) State the uses of carbon (IV) oxide. (2 marks)
19. State two physical properties of carbon (II) oxide.
(2 marks)
20. Experiment was set as shown below.
To the​

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.