ISEB Common Entrance Exam at 13+ Science: Study Guide & Test Prep  /  Science Courses

Test Prep Plan - Take a practice test

Take this practice test to check your existing knowledge of the course material. We'll review your answers and create a Test Prep Plan for you based on your results.
How Test Prep Plans work
1
Answer 50 questions
Test your existing knowledge.
2
View your test results
Based on your results, we'll create a customized Test Prep Plan just for you!
3
Study smarter
Study more effectively: skip concepts you already know and focus on what you still need to learn.

Pure & Impure Substances 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!

Page 1

Question 1 1. If you had a mixture of three liquids and needed to separate the mixture into its pure components, you would need to utilize a Liebig condenser in your separation method. What purification method would you most likely choose to separate the liquids?

Question 2 2. Which of the following represents the proper directional flow of water regarding the ports of a Liebig condenser?

Question 3 3. What causes a phase change to occur?

Question 4 4. Evaporative cooling works to cool down our bodies because water _____ off of our skin, _____ heat.

Question 5 5. When the indicator bromothymol blue is added to a basic solution, the color changes to which one of the following?

Page 2

Question 6 6. Which of the following pH values would indicate a basic solution?

Question 7 7. How many layers is the atmosphere broken down into?

Question 8 8. Which of the following is not a layer of the atmosphere?

Question 9 9. What is the difference between a balanced equation and an unbalanced equation?

Question 10 10. In a chemical reaction, 300 grams of reactant A are combined with 100 grams of reactant B. Both A and B react to completion. How much will the product weigh?

Page 3

Question 11 11. Homogeneous mixtures are also called

Question 12 12. You performed paper chromatography on some marker ink and found that one of the pigments had a retention factor of 0.25. The total distance the solvent traveled was 8.0 cm. How far did the pigment travel?

Question 13 13. A _____ is a liquid that other substances dissolve in.

Question 14 14. What holds a water molecule together?

Question 15 15. Which of the following is NOT a way to separate a mixture?

Page 4

Question 16 16. What makes a water molecule, H20, different from the mixture in a glass of tap water?

Question 17 17. Which of the following describes how purity affects the chemical properties of a substance?

Question 18 18. A pure metal's melting point will be _____.

Question 19 19. The phase change when a solid goes directly to a gas is called:

Question 20 20. The phase change when gas turns directly into a solid is called:

Page 5

Question 21 21. Which of the following is NOT true regarding solubility curves?

Question 22 22.

Suppose a solution at 50℃ contains 12g Potassium dichromate (K₂Cr₂O₇) per 100g of water.

Based on the provided solubility curve, how much additional mass of Potassium dichromate would be required to saturate the solution at the same temperature?

Question 23 23. When water is allowed to flow into a Liebig condenser, it surrounds the inner tube and creates a _____ _____, which allows vapors to condense back down to liquid form.

Question 24 24. Most substances _____ when they freeze.

Question 25 25. According the the Bronsted-Lowry definition, bases do which one of the following?

Page 6

Question 26 26. Which layer of the atmosphere is the coldest?

Question 27 27. In a reaction, 25 grams of reactant AB breaks down into 10 grams of product A and an unknown amount of product B. Using the law of conservation of mass, how much does product B weigh?

Question 28 28. Which of the following is the most heterogeneous mixture?

Question 29 29. What does it mean to be a polar molecule?

Question 30 30. Which of the following statements is NOT true about mixtures?

Pure & Impure Substances 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!

Support