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Topic 13: Lab and
Set A. Lab procedure, report and safety
1. Which of the following statements contained in a student’s laboratory report is a conclusion?
1) A gas is evolved 3) The gas is hydrogen
2) The gas is insoluble in water 4) The gas burns in air
2. Which of the following statements in a student’s laboratory report is an observation?
1) Metal A will also react with an acid 3) Metal A is an alkali metal
2) Metal A has luster 4) Metal A will be good for electrical wiring
3. During a laboratory activity, a student combined two solutions. In the laboratory report, the student
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wrote “ A yellow color appeared.” The statement represents the student’s recorded
1) Conclusion 3) Hypothesis
2) Observation 4) Inference
4. A student investigated the physical and chemical properties of a sample of an unknown gas and then
identified the gas. Which statement represents a conclusion rather than an experimental observation?
1) The gas is colorless
2) The gas is carbon dioxide
3) When the gas is bubbled into limewater, the liquid becomes cloudy
4) When placed in the gas, a flaming splint stops burning
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5. Flame tests are used to identify
1) Polar molecules 3) Nonmetal ions
2) Nonpolar molecules 4) Metal ions
6. What is the safest method for diluting concentrated sulfuric acid with water?
1) Add the acid to the water quickly 3) Add the acid to the water slowly while stirring
2) Add the water to the acid quickly 4) Add the water to the acid slowly while stirring
7. A student wishes to prepare approximately 100 ml of an aqueous solution of 6 M HCl using 12 M HCl.
Which procedure is correct?
1) Adding 50 ml of 12 M HCl to 50 mL of water while stirring the mixture steadily
2) Adding 50 ml of 12 M HCl to 50 ml of water, and then stir the mixture steadily
3) Adding 50 ml of water to 50 mL of 12 M HCl while stirring the mixture steadily
4) Adding 50 ml of water to 50 mL of 12 M HCl , and then stir the mixture steadily
8. Which activity is considered a proper laboratory technique
1) Heating the contents of an open test tube held vertically over a flame
2) Heating the content of a test tube that has been closed with a stopper
3) Adding water to a concentrated acids
4) Striking a match first before turning on the gas valve to light a Bunsen burner
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 355
Topic 13: Lab and
Set A. Lab procedure, report and safety
1. Which of the following statements contained in a student’s laboratory report is a conclusion?
1) A gas is evolved 3) The gas is hydrogen
2) The gas is insoluble in water 4) The gas burns in air
2. Which of the following statements in a student’s laboratory report is an observation?
1) Metal A will also react with an acid 3) Metal A is an alkali metal
2) Metal A has luster 4) Metal A will be good for electrical wiring
3. During a laboratory activity, a student combined two solutions. In the laboratory report, the student
Teacher Preview Copy
wrote “ A yellow color appeared.” The statement represents the student’s recorded
1) Conclusion 3) Hypothesis
2) Observation 4) Inference
4. A student investigated the physical and chemical properties of a sample of an unknown gas and then
identified the gas. Which statement represents a conclusion rather than an experimental observation?
1) The gas is colorless
2) The gas is carbon dioxide
3) When the gas is bubbled into limewater, the liquid becomes cloudy
4) When placed in the gas, a flaming splint stops burning
Teacher Preview Copy
5. Flame tests are used to identify
1) Polar molecules 3) Nonmetal ions
2) Nonpolar molecules 4) Metal ions
6. What is the safest method for diluting concentrated sulfuric acid with water?
1) Add the acid to the water quickly 3) Add the acid to the water slowly while stirring
2) Add the water to the acid quickly 4) Add the water to the acid slowly while stirring
7. A student wishes to prepare approximately 100 ml of an aqueous solution of 6 M HCl using 12 M HCl.
Which procedure is correct?
1) Adding 50 ml of 12 M HCl to 50 mL of water while stirring the mixture steadily
2) Adding 50 ml of 12 M HCl to 50 ml of water, and then stir the mixture steadily
3) Adding 50 ml of water to 50 mL of 12 M HCl while stirring the mixture steadily
4) Adding 50 ml of water to 50 mL of 12 M HCl , and then stir the mixture steadily
8. Which activity is considered a proper laboratory technique
1) Heating the contents of an open test tube held vertically over a flame
2) Heating the content of a test tube that has been closed with a stopper
3) Adding water to a concentrated acids
4) Striking a match first before turning on the gas valve to light a Bunsen burner
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 355
