1. < BackNext >PreviewMain The World of Physical Science Preview Chapter 1 CRCT Preparation

2. < BackNext >PreviewMain Chapter 1 CRCT Preparation 1. Acids turn blue litmus paper red, and bases turn red litmus paper blue. Look at the table. What is the identity of substance 3? A drain cleaner B vinegar C hydrochloric acid D baking soda

3. < BackNext >PreviewMain Chapter 1 CRCT Preparation 1. Acids turn blue litmus paper red, and bases turn red litmus paper blue. Look at the table. What is the identity of substance 3? A drain cleaner B vinegar C hydrochloric acid D baking soda

4. < BackNext >PreviewMain Chapter 1 CRCT Preparation 2. What would happen when water is tested using a piece of blue litmus paper? A The litmus paper would not change color. B The litmus paper would turn pink. C The litmus paper would turn red. D The litmus paper would turn light blue.

5. < BackNext >PreviewMain Chapter 1 CRCT Preparation 2. What would happen when water is tested using a piece of blue litmus paper? A The litmus paper would not change color. B The litmus paper would turn pink. C The litmus paper would turn red. D The litmus paper would turn light blue.

6. < BackNext >PreviewMain 3. After swimming in the ocean, Jorge sits in the sun to dry off. He notices small white crystals on his skin. Analyze the strengths and weaknesses of the following explanations. Which is the most reasonable explanation for what has happened to Jorge? A The water evaporated and attracted dust to Jorge’s skin. B The white crystals are dead skin cells that are being shed. C Jorge has developed a rare skin disorder. D Salt that is dissolved in the water remained on Jorge’s skin after the water evaporated. Chapter 1 CRCT Preparation

7. < BackNext >PreviewMain Chapter 1 CRCT Preparation 3. After swimming in the ocean, Jorge sits in the sun to dry off. He notices small white crystals on his skin. Analyze the strengths and weaknesses of the following explanations. Which is the most reasonable explanation for what has happened to Jorge? A The water evaporated and attracted dust to Jorge’s skin. B The white crystals are dead skin cells that are being shed. C Jorge has developed a rare skin disorder. D Salt that is dissolved in the water remained on Jorge’s skin after the water evaporated.

8. < BackNext >PreviewMain 4. What type of model would you use to represent the big bang theory? A physical B conceptual C mathematical D analogical Chapter 1 CRCT Preparation

9. < BackNext >PreviewMain Chapter 1 CRCT Preparation 4. What type of model would you use to represent the big bang theory? A physical B conceptual C mathematical D analogical

10. < BackNext >PreviewMain 5. Which factor would have the least effect on the results of an experiment designed to determine which brand of bar soap most effectively kills bacteria? A the color of the soap B the volume of soap used C the surface on which the soap is used D the ingredients in the soap Chapter 1 CRCT Preparation

11. < BackNext >PreviewMain Chapter 1 CRCT Preparation 5. Which factor would have the least effect on the results of an experiment designed to determine which brand of bar soap most effectively kills bacteria? A the color of the soap B the volume of soap used C the surface on which the soap is used D the ingredients in the soap

12. < BackNext >PreviewMain Chapter 1 CRCT Preparation 6. An environmental scientist suspects that acid precipitation is beginning to affect certain lakes in Georgia. What is the best way to test this hypothesis? A to do library research on the harmful effects of acid precipitation in lakes B to experiment with acid precipitation on water plants native to Georgia C to count the number of water-plant species found in a Georgia lake D to collect lakewater samples and test the pH of each sample

13. < BackNext >PreviewMain Chapter 1 CRCT Preparation 6. An environmental scientist suspects that acid precipitation is beginning to affect certain lakes in Georgia. What is the best way to test this hypothesis? A to do library research on the harmful effects of acid precipitation in lakes B to experiment with acid precipitation on water plants native to Georgia C to count the number of water-plant species found in a Georgia lake D to collect lakewater samples and test the pH of each sample

14. < BackNext >PreviewMain 7. Which of the following statements about the records made during a scientific investigation is true? A Records should be recorded clearly and accurately. B Records should be predicted based on the hypothesis. C Records should be modified to support the hypothesis. D Records should be protected from being seen by other scientists. Chapter 1 CRCT Preparation

15. < BackNext >PreviewMain Chapter 1 CRCT Preparation 7. Which of the following statements about the records made during a scientific investigation is true? A Records should be recorded clearly and accurately. B Records should be predicted based on the hypothesis. C Records should be modified to support the hypothesis. D Records should be protected from being seen by other scientists.

16. < BackNext >PreviewMain 8. Katie wants to learn how various amounts of sunlight affect plants. Which of the following variables is the only one that she should change? A the type of plant B the amount of light C the volume of water D the quantity of nutrients Chapter 1 CRCT Preparation

17. < BackNext >PreviewMain Chapter 1 CRCT Preparation 8. Katie wants to learn how various amounts of sunlight affect plants. Which of the following variables is the only one that she should change? A the type of plant B the amount of light C the volume of water D the quantity of nutrients

18. < BackNext >PreviewMain 9. While collecting data during an experiment on plant growth, Bill sees the situation shown. How many centimeters taller than the plant on the left is the plant on the right? A 0.7 cm B 2.2 cm C 2.9 cm D 5.1 cm Chapter 1 CRCT Preparation

19. < BackNext >PreviewMain Chapter 1 CRCT Preparation 9. While collecting data during an experiment on plant growth, Bill sees the situation shown. How many centimeters taller than the plant on the left is the plant on the right? A 0.7 cm B 2.2 cm C 2.9 cm D 5.1 cm

20. < BackNext >PreviewMain 10. Anthony is designing an experiment to test the effect of water temperature on the solubility of sugar. Describe one way that Anthony might do his experiment. Remember to include a list of variables that he should control. Chapter 1 CRCT Preparation

21. < BackNext >PreviewMain 10. Answer - Full credit answers should include the following points: The amount of sugar must be measured before it is dissolved. The sugar can be measured by either mass or volume. The temperature of the water used must vary and must be measured. Variables to control include volume of water, amount of stirring, and the type of sugar. Chapter 1 CRCT Preparation

22. < BackNext >PreviewMain 11. The southern end of the Appalachian Trail is located in Georgia’s Amicalola Falls State Park. Laishan works as a park ranger in that park. Describe three ways that Laishan can use science in her job. Chapter 1 CRCT Preparation

23. < BackNext >PreviewMain 11. Answer - Possible responses may include: monitoring water quality; studying the behavior of wildlife; preventing the spread of disease in plants; studying the effect of humans on the ecosystems of the park; or monitoring weather conditions in the park. Chapter 1 CRCT Preparation