1. You put an unknown substance into a graduated cylinder filled with 60 ml of water. After the substance is submerged, the water level rises to 90 ml, Then,
you measure the mass of your substance. The mass is 25 g. What is the density
of the substance?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

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:

Condensation happens when water vapor cools. true or false? ?