Warm air and cold air .
PLZ ILL GIVE BRAINLIEST!!!

warm air rises and cold air decreases

Explanation:

cold: The absorbed energy moves and expands the molecules in the air, thus reducing the air density  

hot: Hot air increases because it expands when you heat air.

warm air rises and cold air decreases

Explanation:

cold: The absorbed energy moves and expands the molecules in the air, thus reducing the air density

hot: Hot air increases because it expands when you heat air.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles