To change the energy in a substance, you must change what?

temperature

solid

volume

density

List four observations that indicate that a chemical reaction may be taking place

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

The data below were determined for the reaction shown below. s2o82– + 3i – (aq) → 2so42– + i3– expt. # [s2o82–] (m) [i –] (m) initial rate 1 0.038 0.060 1.4 × 10 – 5 m/s 2 0.076 0.060 2.8 × 10 – 5 m/s 3 0.076 0.030 1.4 × 10 – 5 m/s the rate law for this reaction must be: