1 The

states that mass cannot be created or destroyed.

Why does ice have a different density than liquid water? A. It has a different amount of space between molecules. B. It has several different kinds of molecules. C. It has more molecules. D. It has lighter molecules.

Why are cells called the "building blocks" of all living things?

Scientific predictions based on laws are formulated using: A. deductive reasoning B. inductive reasoning C. presuppositions D. subjective reasoning

Which of the following is a solution? A. Dirt B. An alloy C. Wood D. Plastic

To which of the following classes of molecules does benzene belong to? a. Aldehydes b. Ethers c. Aromatics d. Esters e. Carboxylic acids

What is the name of the scientist who discovered the electron

Which of these is not a covalent molecule? 1. F2 2. CO 3. LiF 4. NH3

Define buffer capacity. a. buffer capacity is the amount of acid or base that can be added to a buffer without destroying its effectiveness. b. buffer capacity is the amount of acid that can be added until all of the base is used up. c.

Which of the following is not a chemical reaction a) gas formation b) solid formation c) energy change d) state change

How many moles of copper are needed to react with sulfur to produce 0.25 moles Ol copper (1) sulfide according to the following reaction: 2 Cu + S + Cuzs