National Evaluation Series (NES) Chemistry – Sample

A 10 L cylinder contains 4 moles of oxygen, 3 moles of nitrogen and 7 moles of neon. The temperature of the cylinder is increased from 20 �C to 40 �C. Determine the partial pressure of neon in the cylinder as a percentage of the whole.

A gas at constant volume is cooled. Which statement about the gas must be true?

A student knows that for a particular buffer solution, Ka = 4.54 x 10^-6 and H+ = 8.25 x 10^-6. What’s the pH of the solution?

A tin atom has 50 electrons. Electrons in the __________ subshell experience the lowest effective nuclear charge.

A weather balloon is filled with 1000 mol of He gas at 25�C and 101 kPa of pressure. What is the volume of the weather balloon?

As you move from left to right on the periodic table, what generally happens to the boiling point of elements?

ATP is created during _____ reactions, and used during _____ reactions.

Automobile mechanics measure the density of the electrolyte solution of lead storage batteries to
determine the amount of charge remaining. Which of the following statements describes the cause
of the change in electrolyte density as the battery’s charge decreases?

Cobalt-57 has a half-life of about 272 days. If a sample has an initial mass of 2.24 grams and undergoes decay until it has a mass of 0.140 grams, then how many half-lives passed?

During an exam, what should you do if you’re having trouble visualizing the line graph that matches your data table?