A cup of tea with a mass of 210g is warmed from 25°C to 52°C. How much energy is needed?

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Which characteristics can be used to differentiate star systems? check all that apply.