Can someone help please

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

What forms when chemical reactions combine pollution with sunlight?

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?