Would your work in cleaning the beach be considered physical or a chemical change to the environment? Explain your reasoning.

Select the correct statement about chemical energy, a term used by biologists to refer to potential energy available for release in a chemical reaction.

Where can you find the information needed to change grams of a substance to moles? A. coefficients B. oxidation numbers C. electronegativity values D. periodic table E. diagonal rule

Identify the number of core and valence electrons for each atom. Xe : core electrons Xe : valence electrons Ca : core electrons Ca : valence electrons Br : core electrons Br : valence electrons

A diver is 15 feet below sea level. A scientist on a boat is 12 feet above sea level. Who is farthest from sea level.

The bond strength of compounds A, B, C, and D as measured by their bond energies (kJ/mol) are 350, 500, 180, and 1,450, respectively. Which compound will most likely conduct electricity when dissolved in water?

What are some disadvantages of incinerators?

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false