Select the correct answer from each drop-down menu.

the graph shows the heating curve of a chemical substance as it undergoes state changes from solid to liquid to gas. analyze the curve, and answer the questions.

the substance is entirely solid between positions,
a and b
b and c
c and d
d and e
e and f

particles of the substance are in the liquid state and are gaining kinetic energy between positions,
a and b
b and c
c and d
d and e
e and f

1- A and B.

2- C and D.

Explanation:

Kindly, see the attached image carefully that shows the analysis of  state changes from solid to liquid to gas at the heating curve of a chemical substance as it undergoes state changes from solid to liquid to gas.

So,

1- The substance is entirely solid between positions,  A and B.

2- Particles of the substance are in the liquid state and are gaining kinetic energy between positions, C and D.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied