According to the law of conservation of mass, how many grams of product will be produced when 4 grams of reactants are involved in a chemical reaction? a. 2 b. 3 c. 4 d. 8

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?