Explain how mass and energy can be conserved even during a chemical change.

Which is more prevalent in the food we eat: carbon-12 or carbon-14?

In the PhET simulation window, click the radio button labeled Mystery in the Blocks menu on the right-hand side of the screen.

Name three of the most sensitive parts of your body (Appropriate parts. Ex: finger, wrist, shoulder, etc.)

Hydrogen peroxide is toxic to cells, yet is a common byproduct of the reactions that occur inside the body. how can this compound be changed to become non-toxic (hint: look at the chemical formula of hydrogen peroxide).

A large container of water and a small one are at the same temperature. What can be said about the relative vapor pressures of the water in the two containers?

What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu? (a) 65.3 amu (b) 64.4 amu (c) 64.9 amu (d) 65.0 amu (e) 64.8 amu

Is this base a physical or chemical property?

Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte. a) LiClO4 b) HClO c) CH3CH2CH2OH d) HClO3 e) CuSO4 f) C12H22O11

Give examples of temporaty physical change

Which of these is a source of sediment? A. Fragments of other rocks B. Chemicals and Minerals dissolve in water C. Sea shells D. All of the above