What part of the scientific method involves controlling variables while testing a hypothesis? analyzing data conducting an experiment drawing a conclusion making observations

Conducting an experiment

Explanation:

This is because you must test your hypothesis by doing an experiment on the hypothesis

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.