Lab Equipment,Safety and the Scientific method

1. Lab Equipment,Safety and the Scientific method

2. Always point a test tube that is being heated • Away from you and toward others • Toward you and away from others • Toward you and others • Away from you and others

3. Identify the picture • Erlenmeyer flasks hold solids or liquids that may release gases during a reaction or that are likely to splatter if stirred or heated. • Beakers hold solids or liquids that will not release gases when reacted • A graduated cylinder is used to measure volumes of liquids. • A Mohr pipet measures and delivers exact volumes of liquids.

4. To dispose of all chemicals, • Follow the instructions of your teacher • Throw them in the trash • Burn them in a burner • Flush them down the sink

5. Identify the picture • Erlenmeyer flasks hold solids or liquids that may release gases during a reaction or that are likely to splatter if stirred or heated. • Beakers hold solids or liquids that will not release gases when reacted • A graduated cylinder is used to measure volumes of liquids. • A Mohr pipet measures and delivers exact volumes of liquids.

6. This is used for lab Equipment is used for • Weighing boats are used to weigh solids • A wash bottle that contains tap water used to as a wash solution. Flush them down the sink • A wash bottle that contains distilled water used to as a wash solution. • The evaporating dish is used for the heating of stable solid compounds and elements.

7. This is used for lab Equipment is used for • Weighing boats are used to weigh solids • A wash bottle that contains tap water used to as a wash solution. Flush them down the sink • A wash bottle that contains distilled water used to as a wash solution. • The evaporating dish is used for the heating of stable solid compounds and elements.

8. Identify this equipment • A watch glass is used to hold a small amount of solid, such as the product of a reaction. • Watch glass provide a surface for semi-micro scale experiments, such as drop reactions and testing of acids and bases. • The evaporating dish is used for the heating of stable solid compounds and elements. • Crucibles are used for heating certain solids, particularly metals, to very high temperatures.

9. Whom should you call in case of an emergency in the lab? • Instructor • Nobody • A friend • Anybody

10. What should be worn in a laboratory at all times to decrease the likelihood of eye injury? • Corrective lenses • Safety Glasses • A mask • Nothing

11. Why is it not advisable to wear contact lenses in the lab? • Lenses could inadvertently fall out of the eye • Chemical vapor could become trapped between the lenses and the eye • Chemical vapor could literally react with the lenses • All of the above

12. Eating and drinking is not permitted in the lab because: • There would not be enough time to finish the experiment • The storeroom serves terrible appetizers • You could be poisoned • The lab would become quite messy with this type of activity

13. What is the proper order of the scientific method • hypothesis, experiment, problem, research, data, conclusion • problem, research, hypothesis, experiment, data, conclusion • problem, hypothesis, research, experiment, data, conclusion • hypothesis, problem, research, experiment, data, conclusion

14. Give an example of a research problem • Students will eat a prescribed breakfast one hour before testing • Does eating breakfast affect the reaction time of high school students? • Eating breakfast • Students who eat breakfast will have a faster reaction time

15. Which of these would be used to accurately measure the volume of a liquid • graduated cylinder • test tube • beaker • flask

16. Which shows the order of scientific knowledge from least importance to most importance? • law, hypothesis,theory • hypothesis, law,theory • hypothesis,theory, law • Theory, hypothesis, law

17. A student wishes to test the rate of photosynthesis in plants at different temperatures. Elodea plants will be tested at different temperatures and the rate of O2 production will be measured. Identify the dependent variable. • Does the temperature affect the rate of oxygen production in elodea? • temperature • Plants kept at constant temperature • O2 production

18. A student wishes to test the rate of photosynthesis in plants at different temperatures. Elodea plants will be tested at different temperatures and the rate of O2 production will be measured. Identify the independent variable. • Does the temperature affect the rate of oxygen production in elodea? • temperature • Plants kept at constant temperature • O2 production

19. A student wishes to test the rate of photosynthesis in plants at different temperatures. Elodea plants will be tested at different temperatures and the rate of O2 production will be measured. Identify the hypothesis. • Does the temperature affect the rate of oxygen production in elodea? • Set of plants which undergoes temperature change • Plants kept at constant temperature • Increase the temperature will increase the rate of O2 production

20. A student wishes to test the rate of photosynthesis in plants at different temperatures. Elodea plants will be tested at different temperatures and the rate of O2 production will be measured. Identify the controlled group. • Does the temperature affect the rate of oxygen production in elodea? • Set of plants which undergoes temperature change • Plants kept at constant temperature • Increase the temperature will increase the rate of O2 production