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Water and Bunsen Burner Essay

1. Base your answer on the diagram below and on your knowledge of biology.

4. Which safety precaution is recommended when a liquid is being heated in a test tube? A) When holding the test tube, keep fingers closest to the open end of the tube. B) Direct the flame of the burner into the open end of the test tube. C) Stopper the test tube with a rubber stopper. D) Wear goggles and a laboratory apron. 5. Base your answer on the diagram below and on your knowledge of biology.

Which statement describes two unsafe laboratory practices represented in the diagram? A) The flame is too high and the test tube is opened. B) The opening of the test tube is pointed toward the student and the student is not wearing goggles. C) The test tube is unstoppered and the student is not wearing goggles. D) The beaker has water in it and the flame is under the tripod. 2. Which safety precaution is recommended when a liquid is being heated in a test tube? A) Wear goggles and a laboratory apron.

B) Direct the flame of the burner into the open end of the test tube. C) Stopper the test tube with a rubber stopper. D) Goggles and a laboratory apron do not need to be worn 3. Chlorophyll can be removed from leaves by boiling them in alcohol, a flammable solvent. In addition to wearing safety goggles, which is the safest procedure to follow? A) A stoppered test tube of leaves and alcohol should be held over a Bunsen burner. B) A stoppered test tube of leaves and alcohol should be placed into a beaker of alcohol on a tripod over a Bunsen burner. C) A beaker of leaves and alcohol should be placed on a tripod over a Bunsen burner. D) A beaker of leaves and alcohol should be placed into a larger beaker of water and heated on a hot plate.

Which statement describes two unsafe laboratory practices represented in the diagram? A) The flame is too high and the test tube is unstoppered. B) The opening of the test tube is pointed toward the student and the student is not wearing goggles. C) The test tube is unstoppered and the student is not wearing goggles. D) The beaker has water in it and the flame is under the tripod. 6. When heating liquid materials in laboratory glassware, a student should always A) B) C) D) A) B) C) D) wear safety goggles use Benedict’s solution stopper the test tube record the temperature of the liquid point the test tube in any direction hold the test tube with two fingers cork the test tube wear goggles

7. When heating a solution in a test tube, a student should

8. The directions for a laboratory activity call for 50 milliliters (ml) of solution A. A student accidentally takes 55 ml from the stock bottle. What should the student do with the extra 5 ml of solution A? A) Return the extra 5 ml to the stock bottle and replace the cap. B) Pour the extra 5 ml down the drain and rinse the sink with cold water. C) Dilute the extra 5 ml with 100 ml of water and pour it down the drain. D) Set the extra 5 ml aside in a labeled beaker and ask the teacher for advice. 9. Chlorophyll can be removed from leaves by boiling them in alcohol, a flammable solvent. In addition to wearing safety goggles, which is the safest procedure to follow? A) A stoppered test tube of leaves and alcohol should be held over a Bunsen burner. B) A stoppered test tube of leaves and alcohol should be placed into a beaker of alcohol on a tripod over a Bunsen burner. C) A beaker of leaves and alcohol should be placed on a tripod over a Bunsen burner.

D) A beaker of leaves and alcohol should be placed into a larger beaker of water and heated on a hot plate. 10. Which statement represents an unsafe procedure for heating a nutrient solution in a flask? A) heat the solution at the lowest temperature possible on a hot plate B) stopper the flask tightly to prevent evaporation of the solution C) use a Bunsen burner to heat the solution D) stir the solution while it is heating 11. Which safety precaution is recommended when a liquid is being heated in a test tube? A) When holding the test tube, keep fingers closest to the open end of the tube. B) Direct the flame of the burner into the open end of the test tube. C) Stopper the test tube with a rubber stopper. D) Wear goggles and a laboratory apron.

12. Base your answer on the diagram below and on your knowledge of biology.

Which statement describes two unsafe laboratory practices represented in the diagram? A) The flame is too high and the test tube is unstoppered. B) The opening of the test tube is pointed toward the student and the student is not wearing goggles. C) The test tube is unstoppered and the student is not wearing goggles. D) The beaker has water in it and the flame is under the tripod.

13. Kyle is making toast but the slice of bread gets stuck in the toaster. He grabs a metal knife to get the bread out. What is the most important thing for Kyle to do before pulling the bread out of the toaster? A) Grab a plate to put the bread on. B) Unplug the toaster. C) Get out the butter so he can spread it on the toast while it is still hot. D) Turn the toaster upside down. 14. Which of the following describes the proper actions to be taken before participating in laboratory activities? A) B) C) D) Roll down sleeves and wear sandals. Roll down sleeves and leave hair down. Roll up sleeves and push hair back. Eat in the lab and do not wear goggles.

15. All of these activities are examples of safe laboratory practices except A) wearing goggles and aprons. B) leaving boiling water unattended. C) cleaning glassware before storing them in labeled cabinets. D) rinsing glassware with distilled water after washing.

16. A sign in a chemistry lab says “Never drink from the glassware.” What is the most likely reason for this warning? A) B) C) D) Many of the chemicals used are poisonous. The chemicals are reused. It could spread germs. The glassware could have broken pieces of glass in it.

21. Base your answer on the diagram below and on your knowledge of biology.

17. Which of the following is not a safe laboratory procedure? A) B) C) D) wearing goggles when working with chemicals wafting in order to smell chemical reactions pouring chemicals down the drain cleaning all equipment after it is used Which statement describes two unsafe laboratory practices represented in the diagram? A) The flame is too high and the test tube is unstoppered. B) The opening of the test tube is pointed toward the student and the student is not wearing goggles. C) The test tube is unstoppered and the student is not wearing goggles. D) The beaker has water in it and the flame is under the tripod. 22. When heating liquid materials in laboratory glassware, a student should always A) B) C) D) wear safety goggles use Benedict’s solution stopper the test tube record the temperature of the liquid

18. Why is it advisable to use tongs when taking a beaker off of a hot plate? A) B) C) D) It prevents the beaker from breaking. The beaker is too hot to touch. It prevents the contents from spilling. It allows you to leave the cover on.

19. Which of the following reasons explains why you shouldn’t work with live electrical wires? A) B) C) D) It creates a safety hazard. It is too expensive. It is against the law. They do not carry any current.

20. Some household chemicals should not be combined because this process A) B) C) D) produces nuclear waste. may result in hazardous combinations. is against the law. is very expensive.

23. During a science experiment Jack spilled an unknown powder. What should he do first? A) Tell the teacher immediately that he spilled the powder. B) Put on gloves to protect his hands. C) Clean it up and put it in the trash. D) Clean it up and wash it down the drain. 24. What safety measure should always be taken when working with an unknown liquid? A) Store the container of liquid on a low shelf within the reach of most students. B) Use a large amount of the liquid at a time. C) Never taste or directly smell the liquid from the bottle. D) When you are finished, pour the liquid down the sink.

25. Some science activities require tools or instruments that use electricity. What safety measure should you take whenever you perform a science activity that involves using electricity? A) Wear rubber gloves to keep your hands clean. B) Perform the activity with the help of an adult or under adult supervision. C) Wear sneakers or other shoes with rubber soles. D) All of the above.


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