The World of Physical Science

1. Chapter 1 The World of Physical Science Preview CRCT Preparation

2. CRCT Preparation Chapter 1 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? Adrain cleaner Bvinegar Chydrochloric acid Dbaking soda

3. CRCT Preparation Chapter 1 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? Adrain cleaner Bvinegar Chydrochloric acid D baking soda

4. CRCT Preparation Chapter 1 2. What would happen when water is tested using a piece of blue litmus paper? AThe litmus paper would not change color. BThe litmus paper would turn pink. CThe litmus paper would turn red. DThe litmus paper would turn light blue.

5. CRCT Preparation Chapter 1 2. What would happen when water is tested using a piece of blue litmus paper? A The litmus paper would not change color. BThe litmus paper would turn pink. CThe litmus paper would turn red. DThe litmus paper would turn light blue.

6. CRCT Preparation Chapter 1 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? AThe water evaporated and attracted dust to Jorge’s skin. BThe white crystals are dead skin cells that are being shed. CJorge has developed a rare skin disorder. DSalt that is dissolved in the water remained on Jorge’s skin after the water evaporated.

7. CRCT Preparation Chapter 1 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? AThe water evaporated and attracted dust to Jorge’s skin. BThe white crystals are dead skin cells that are being shed. CJorge has developed a rare skin disorder. D Salt that is dissolved in the water remained on Jorge’s skin after the water evaporated.

8. CRCT Preparation Chapter 1 4. What type of model would you use to represent the big bang theory? Aphysical Bconceptual Cmathematical Danalogical

9. CRCT Preparation Chapter 1 4. What type of model would you use to represent the big bang theory? Aphysical B conceptual Cmathematical Danalogical

10. CRCT Preparation Chapter 1 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? Athe color of the soap Bthe volume of soap used Cthe surface on which the soap is used Dthe ingredients in the soap

11. CRCT Preparation Chapter 1 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 Bthe volume of soap used Cthe surface on which the soap is used Dthe ingredients in the soap

12. CRCT Preparation Chapter 1 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? Ato do library research on the harmful effects of acid precipitation in lakes Bto experiment with acid precipitation on water plants native to Georgia Cto count the number of water-plant species found in a Georgia lake Dto collect lakewater samples and test the pH of each sample

13. CRCT Preparation Chapter 1 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? Ato do library research on the harmful effects of acid precipitation in lakes Bto experiment with acid precipitation on water plants native to Georgia Cto 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. CRCT Preparation Chapter 1 7. Which of the following statements about the records made during a scientific investigation is true? ARecords should be recorded clearly and accurately. BRecords should be predicted based on the hypothesis. CRecords should be modified to support the hypothesis. DRecords should be protected from being seen by other scientists.

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

16. CRCT Preparation Chapter 1 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? Athe type of plant Bthe amount of light Cthe volume of water Dthe quantity of nutrients

17. CRCT Preparation Chapter 1 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? Athe type of plant B the amount of light Cthe volume of water Dthe quantity of nutrients

18. CRCT Preparation Chapter 1 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? A0.7 cm B2.2 cm C2.9 cm D5.1 cm

19. CRCT Preparation Chapter 1 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 B2.2 cm C2.9 cm D5.1 cm

20. CRCT Preparation Chapter 1 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.

21. CRCT Preparation Chapter 1 • 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.

22. CRCT Preparation Chapter 1 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.

23. CRCT Preparation Chapter 1 • 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.