As mentioned in the introduction, paper chromatography is only one type of chromatographic separation. Use your text or web resources to investigate gas chromatography and answer the following questions. a. What is an example of the mobile phase for gas chromatography?
b. What is the stationary phase?
c. What are some common uses for gas chromatography?
d. What is meant by retention time? Will a compound that spends most of its time in the mobile phase has a large or a small retention time?
e. What are some factors that affect the retention time of a molecule?

the answer is c.the valence of the atoms combine .

(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