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Praxis Chemistry (5245): Practice & Study Guide Final Exam

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Question 1 1. A mixture of 5 g sand, 10.4 g gravel, and 204.03 g silt is prepared. What is the total mass of the mixture using the correct number of significant figures and exponential notation?

Question 2 2. The pH of a 5 * 10-5 M NaOH solution is between

Question 3 3. During an experiment, a piece of aluminum is added to a solution and a reddish-brown substance appears on the aluminum. Which of the following is the most reasonable conclusion drawn from this observation?

Question 4 4. In an experiment observing the reaction between solutions of aluminum sulfate and barium chloride, a barium-containing precipitate is formed. Which of the following shows the balanced net ionic equation?

Question 5 5. The correct formula for iron (II) nitrate is

Question 6 6. Molecules of A are held together by hydrogen bonds, while molecules of B are held together by dipole-dipole forces. Which of the following statements is true?

Question 7 7. A scientist is comparing the half-lives of two radioactive elements, Q and R. 800 g of each element are set aside and after four weeks, there is 400 g of Q and 50 g of R left. Which of the following statements is true?

Question 8 8. Which of the following pairs of elements have stable ions with a -2 charge?

Question 9 9. Find the concentration of Cl- in a saturated solution of PbCl2. The Ksp for PbCl2 is 2.0 * 10-5.

Question 10 10. Which of the following is an important function of lipids in living organisms?

Question 11 11. A sample of a pure liquid substance is heated at a constant rate and its temperature is recorded in the graph below. At what temperature is the heat added being used to vaporize the substance?

Question 12 12.

Changes in which the entropy of the system decreases include which of the following?


I. Freezing water into ice

II. Condensation of water

III. Dissolving KCl in room-temperature water

Question 13 13. A fictional element has three naturally occurring isotopes as listed in the chart. The element would be listed on the periodic table with an atomic mass of

Question 14 14. Which of the following pieces of equipment is required for use with toxic gases?

Question 15 15. Based on the given standard reduction potentials, what is the cell potential for the reaction?

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Praxis Chemistry (5245): Practice & Study Guide Final Free Practice Test Instructions

Choose your answer to the question and click 'Continue' to see how you did. Then click 'Next Question' to answer the next question. When you have completed the free practice test, click 'View Results' to see your results. Good luck!

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