You have been studying the solubility rules in science. Today in chemistry lab you must select a ionic compound that will NOT dissolve in water at room temperature. Which compound listed here would be a good choice?
A) CaCrO4
B) Ca(OH)2
C) MgS
D) ZnCl2

You have been given four ionic compounds to add to distilled water. You set up four test tubes containing 25 ml of water at room temperature. To each test tube you add 5 grams of the compounds listed below. Which compound WILL dissolve in water?

A) Na2CrO4

B) PbSO4

C) CuBr

D) AlPO4

Malik formed a hypothesis that an increase in atmospheric oxygen levels by 10% would cause red-legged grasshoppers to grow larger than normal. suppose that malik performs an experiment to test his hypothesis. which of these actions would represent a scientific mistake in his experiment? a. he experiments on live grasshoppers instead of preserved ones. b. he focuses on red-legged grasshoppers instead of all kinds of grasshoppers. c. he varies the nitrogen and carbon dioxide levels in the air from one trial to the next. d. he conducts the experiment in a controlled lab setting with a lab partner. e. he measures the mass and length of his specimens at the start of each trial.