HELP!!! How much heat is required to change 40 g of ice (H2O) at 225 K to vapor (steam) at 387K?

What is the rms speed of cesium atoms that have been cooled to a temperature of 100 nk?

10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?