What kind of chemical do we release when we help others?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Asolution of sodium hydroxide was titrated against a solution of sulfuric acid. how many moles of sodium hydroxide would react with 1 mole of sulfuric acid?

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water