What does the weight of an object depend on?

Can someone me with questions 12 and 13 plz.

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils