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- Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…I. Broken glassware can be disposed of into the general waste trash bin. II. General waste includes papers and plastic bottles. A. First statement is true and second statement is false B. First statement is false and second statement is true C. Both statements are incorrect D. Both statements are correct I. Halogenated waste should be separated from non-halogenated wastes II. These wastes are placed in a blohazard bag. A. First statement is true and second statement is false B. First statement is false and second statement is true C. Both statements are incorrect D. Both statements are correctBurns: What is the difference between Dry & Liquid chemicals?
- Anwer and explain it properly1. What pieces of apparatus or equipment are used for measuring: a. Temperature? b. Small amount of liquids? c. Large amount of liquids? d. Mass of a substance? 2. Suggest ways on how to store and handle properly the different glassware to avoid accidents in the laboratory. You can use illustrations to show your idea. 3. Why is the most of the containers of substances and those used for heating are made up of glass rather than metal? 4. Explain why the thermometer should not be shaken rigorously to lower the reading to zero before using it.Which of the following is not easy to clean up? A. Oil B. Tempera C. Water Color D. Acrylic Which class of colorants requires a binder? A. Dyes B. Pigments C. Mauveine D. Light
- It is the chance or probability that a person will be harmed or experience an adverse health effect if exposed to a hazard. Single choice. a. harm b. hazard c. risk d. severityYou are in a far-flung area, you need what type of container to safely contain/handle hydrochloric acid? a. coke liter container b. glass c. plastic container d. empty syrup glass container *Choose only one answer and explain.Solid particles sticking together to form larger particles describes the process of a. accretion. b. adhesion. c. condensation. d. adherence.
- TRUE OR FALSE __________ 6. Glassware is clean when no water droplets cling to the inner wall of the vessel. __________ 7. When smelling the odor of a chemical substance, fan your hand over the substance toward your nose which should be centimeters away from the substance. __________ 8. An accident as simple as breaking a beaker containing distilled water in the sink does not need to be reported to the laboratory instructor. __________ 9. Students should turn off cell phones, iPads, and other electronic devices during the laboratory class. __________ 10. It is a good laboratory protocol to call other students’ attention when they do not practice good laboratory safety procedures.2. In case of an accident in the classroom, who should be notified immediately? 3. Why is it a safety procedure to tie back long hair in the laboratory? 4. Why should a student not eat or drink in the laboratory? 5. Why should any spills be reported and cleaned immediately? 6. Why should you wash your hands after every laboratory period? 7. Why is rough play in the laboratory dangerous? 8. When would the wearing of safety goggles be a proper procedure? 77. The movement of particles of matter can be affected by some external factors. What are the factors that affect the movement of particles of matter? B. Temperature A. Pressure C. Odor and appearance D. Size and temperature
