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Praxis Biology: Science Principles - Numbers Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1. Which of the following is a conversion factor?

Question 2 2. How many significant figures are in 54,050?

Question 3 3. If you add 50.0 mL of water to a beaker containing 22 mL of water, then how much water do you have in the beaker?

Question 4 4. The density of mercury is 13.6 g/mL. What is its density in lbs/L? (Hint: 1 lb = 0.454 kg)

Question 5 5.

An empty container has a mass of 62.000 grams. You fill it with 24.6 mL of a liquid. The final mass of the container is 81.34 grams. What is the density of the liquid to the correct number of significant figures?

(density of the liquid = mass of the liquid divided by the volume of liquid)

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Question 6 6. How many mL are in 3.4 L?

Question 7 7. What is the hydronium ion concentration or [H3O+] of juice pH 2.25?

Question 8 8. If you are driving at a speed of 55.0 miles per hour, then what is your speed in meters per second? (Hint: 1 mile = 1,600 meters.)

Question 9 9. What is the density of a solid that has a mass of 9.2 grams and a volume of 12.3 cm3 ? Would this object float or sink in water?

Question 10 10. What is the pH of your solution if [H3O+] = 1 x 10^-4?

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Question 11 11. What is the mass of a liquid with a density of 2.12 g/mL and a volume of 53.0 mL (to the nearest gram)?

Question 12 12. What is a neutral solution?

Question 13 13. Which of the following does pH measure?

Question 14 14. Which of the following are arranged from smallest unit to largest unit?

Question 15 15. Simge's guinea pig weighs exactly 560. grams. Which of the following most accurately expresses the weight of Simge's guinea pig in scientific notation?

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Question 16 16. Use dimensional analysis to convert 4 days into seconds.

Question 17 17.

The area of a rectangle can be found by multiplying its length by its width. What is the area of a rectangle that is 5.6 cm in length and 9.24 cm wide?

Report your answer with the correct number of significant figures.

Question 18 18. One mole of aluminum atoms has a mass of 27 grams. How many grams are in 9.0 moles of aluminum?

Question 19 19. What is the pH of a 0.3 M solution of a strong acid?

Question 20 20. Which of the following is the closest to a mass of 500 mL of water?

Praxis Biology: Science Principles - Numbers Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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