For stars in the main sequence, which color of stars tend to have higher absolute brightness?

a white stars
b yellow stars
c blue stars
d red stars

Modern weaponry has increased the number of deaths in wars and violent conflicts.

Based on its chemical properties, identify the position of each chemical family on the periodic table.

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?