|The masses of the reactants and products are always ____.
|An electron has an ____ charge and smaller mass than a proton.
|Oil floats on water because water is ____ than oil.
|All heterogeneous mixtures can be ____ by physical means.
|Positive and negative charges ____ each other.
|A solution with a pH less than 7 is ____.
|Ice ____ because its density is less than liquid water.
|At 25°C, pure water has a pH of 7 and therefore is ____.