A ball is dropped from the top of a building.

When does the ball have the least potential energy?

1 half way through the fall

2

after it has hit the ground

3as it is released

4

just before it hits the ground

Which of the following would increase the rate of a chemical reaction between hydrochloric acid (HCl) and solid zinc metal (Zn) ? A. Decreasing the amount of Zn B. Performing the reaction at a lower temperature C.

Which of these is most likely to form between elements transferring electrons to form oppositely charged particles?

The last element in any period always has: A. two electrons in the outermost energy level B. its outer energy level completed C. the properties of an inert gas D. the lowest atomic weight because it is a gas

If 5.65 grams of zinc metal react with 21.6 grams of silver nitrate, how many grams of silver metal can be formed and how many grams of the excess reactant will be left over when the reaction is complete? Show all of your work.

Suppose two students need to prepare three solutions, each one-half as concentrated as the previous, from a stock solution. (a) One student dilutes 10 mL stock solution to a final volume of 20 mL.

A mixture of 0.438 M H2, 0.444 M I2, and 0.895 M HI is enclosed in a vessel and heated to 430 °C. H2 (g) + I2 (g) 2 HI (g) Kc = 54.3 at 430∘C Calculate the equilibrium concentrations of each gas at 430∘C.

Why is the atmospheric pressure lower on a high mountain peak than at sea level

What is the mole ratio of N2 + 3H2 Right arrow. 2NH3

In a second-order reaction (one that is second order in one reactant), cutting in half the concentration of that reactant will have what effect on the reaction rate? A) The reaction rate will remain the same. B) The reaction rate will double.

How many moles of nitrogen gas are in a 10.0 L container at STP? a. 0.45 moles b. 22.4 moles c. 10.0 moles d. 6.02 x 1023 moles