In liquid water, each molecule is hydrogen-bonded to approximately 3.4 molecules of water. what effect would freezing water have on the number of hydrogen bonds? heating water?

1. Freezing water: The number of hydrogen bonds increase.

2. Heating water: Hydrogen bonds break

Explanation:

In the liquid state, hydrogen bonds are continuously formed and broken and the average amount is 3.4.  During freezing, molecule's energy decreases and there is less energy to break hydrogen bonds and for this reason, these bonds are more stable and average hydrogend bonds are close to 4 bonds.

When liquid water is heated, the kinetic energy raises and it causes the hydrogen bonds to break.

(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