Chemistry Final Review 2

1) Which isotope has the greatest number of protons?

• Pa-238

• U-240

• Np-238

• Pu-239

4) The equation below represents the radioactive decay of a gold isotope.

¹⁷⁴ ₇₉ Au →¹⁷⁰₇₇ Ir + ?

Which choice correctly completes this equation?

• alpha particle

• beta particle

• photon

• neutron

6) How many electrons are in the outermost energy level of a neutral carbon atom?

• 2

• 4

• 6

• 8

29) What can the student conclude about the experiment?

• A chemical reaction occurred because new atoms were created.

• A chemical reaction occurred because a new substance was formed.

• The popping sound provided evidence that the acid changed physical states.

• The popping sound provided evidence that the magnesium atoms were

  destroyed.

30) How many O₂ particles are in 2.50 moles of O₂ at Standard Temperature and Pressure (STP)?

• 4.15 × 10²² particles

• 2.41 × 10²³ particles

• 5.02 × 10²³ particles

• 1.51 × 10²⁴ particles

31) Why does an increase in temperature usually increase the rate of a chemical reaction?

• because the activation energy of the reaction increases

• because the surface area of reacting particles increases

• because the proper orientation of reacting particles improves

• because the number of effective collisions between reacting particles increases

33) Which temperature has the greatest concentration of product Z?

• 200 K

• 300 K

• 400 K

• 500 K

32) Which action will cause the reaction to shift to the left?

• heating the flask with a hot plate

• placing the flask in an ice bath

• removing H₂O from the flask

• adding CO to the flask

35) A solution has a pOH of 12. Which best describes the solution?

• It has a pH of 2 and is a base.

• It has a pH of 12 and is a base.

• It has a pH of 2 and is an acid.

• It has a pH of 12 and is an acid.

36) A student describes a liquid as feeling slippery. The student places red litmus paper into the liquid, and the paper turns blue. What can the student conclude from these observations?

• The substance is likely a nonmetal.

• The substance is likely a metal.

• The substance is likely a base.

• The substance is likely an acid.