Many chemical processes involve substances in either the liquid or the gaseous state. Which of the following statements is correct?
A. A specific mass of a gas has a fixed volume at room temperature
B. A specific mass of a liquid has a fixed volume at room temperature
C. 25 cm of gas contains more particles than 25 cm of liquid
D. Liquid particles placed inside a sealed container have fixed positions
[1 mark]

answeridentity;

(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

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.