Which statement is true about the particles of a solid, when a solid changes into a liquid

Which statement is true about the particles of a solid when the solid changes into a liquid? (5 points)

a. They stop vibrating.

Selected: b. Their kinetic energy increases. This answer is correct.

c. They move closer to each other.

d. The attractive force between them increases.

Explanation: when a solid turns to a liquid it means it was melted and it needs to be heated to melt meaning the kinetic energy increases because the solid was heated up. Also this was on my test and i got it right so yeah.

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

the role of the microscope world in creating new materials .