Objective 1…TAKS 10 th and 11 th grades Home slide

1. Objective 1…TAKS 10th and 11th grades Home slide Home TAKS questions from released tests, study guides and information booklet: Safety, measurement, correct choice of equipment Interpreting graphs and illustrations Analyzing promotional labels and ads The Scientific Method Links to non-TAKS tutorials and quizzes Link to 10th grade study guide Scroll to p.251 for objective 1 Link to 11th grade study guide Scroll to p.297 for objective 1

2. Home Non-TAKS tutorials & quizzes

3. Home Safety/Measurements/Equipment choices Back to safety, etc • Understanding safety precautions • Reading measurements • Choosing equipment

4. A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to — A neutralize the acid that is reacting to produce the noxious fumes B carry the reactants outside, away from other students C leave the room and go to an area with fresh air D spray the reaction with a fire extinguisher Home Back to safety, etc 55

5. The safest way to dilute concentrated sulfuric acid is to add A a series of small volumes of water to the acid while stirring B the acid to water slowly while stirring constantly C the acid to a small volume of water and then add more water D dilute sulfuric acid to a small volume of the concentrated acid Home Back to safety, etc 1

6. Acids must be handled with extreme care. You will be shown the proper method for diluting strong acids. Always add acid to water, swirl or stir the solution and be careful of the heat produced, particularly with sulfuric acid. Home Back to safety, etc AW WA

7. Laboratory equipment is cleaned and properly stored after use primarily so that — A chemical products can be measured and recorded as data B time is saved in setting up the next experiment C toxic materials can be kept in the laboratory D the possibility of contamination in the laboratory is minimized Home Back to safety, etc A clean lab prevents accidents, contamination and worry. 55

8. The reason forwafting or fanning a small amount of chemical vapors toward the nose as a means to detect odors in a test tube is to — A avoid experimental error from excessive loss of mass of reactants or products B avoid splashing chemicals into the face of any person C protect the respiratory tract against potentially harmful vapors D determine the relative strength of the odor before smelling directly Home Back to safety, etc 15

9. Home Back to safety, etc Reactions that produce toxic gases should be performed in a — A laboratory fume hood B beaker with a watch glass on top C well-ventilated area of the lab D warm, airtight drying oven 15

10. All of these procedures must be followed when using the setup shown except — A putting on safety goggles B handling the beaker with tongs C securing loose clothing D wearing rubber gloves Always wear goggles when using glassware, heat/fire and chemicals. And always secure loose clothing and hair. Home Back to safety, etc Latex, rubber gloves would melt. Cotton gloves handle heated glassware. 9

11. Home Back to safety, etc A safety checklist for this activity should include the presence of a proper fire extinguisher and all the following items except a — A fire blanket B receptacle for broken glass C laboratory apron D squeeze bottle Lab aprons are used when there is fire and/or chemicals in use. 35

12. Home Back to safety, etc The ingredients described above are used to make a bonding agent. The most important safety precaution to take when applying this bonding agent is to — F dry it with a small flame G work in a well-ventilated area H cover the work area with newspaper J wear a lab coat 2

13. Home Back to safety, etc Classification symbols for certain fire extinguishers are shown below. Which class of fire extinguisher should be used when a hot plate overheats and catches on fire? 24

14. Home Back to safety, etc

15. Home Back to safety, etc Assume all unknown materials are toxic until finding out differently. Which safety precaution should be observed while analyzing sediment from a marine aquarium? A Wear rubber gloves B Use a fume hood C Avoid using glassware D Have a fire extinguisher nearby 15

16. Home Back to safety, etc Which of the following shows the length of a rubber strip measured precisely to 2.22 centimeters? – 7

17. Home Back to safety, etc

18. Home Back to safety, etc 47 – 38 = 9 mL The illustration shows volume levels of a liquid in a graduated cylinder before and after a sample was removed. According to this information, what was the volume of the sample to the nearest milliliter? Record and bubble in your answer on the answer document. 20