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Scientific Method and Lab Safety Pre-Assessment — 8th Grade Science (with Answer Key)

Questions
Grade 8
English

Scientific Method and Lab Safety Pre-Assessment — 8th Grade Science (with Answer Key)

Lab Safety Scenarios

1. True or False: Safety goggles only need to be worn when you are personally handling chemicals, not when you are just watching a demonstration.
A. True B. False 2. True or False: It is acceptable to drink water in the science lab as long as it is in a sealed plastic bottle and kept on your desk.
A. False B. True 3. While reaching for a beaker, a student accidentally knocks it over and it shatters on the floor. What is the very first thing the student should do?
A. Carefully step over the glass and continue with the experiment. B. Pick up the large pieces with their hands and leave the small bits for the teacher. C. Find a broom and dustpan to clean it up before the teacher notices. D. Tell nearby classmates to stay back and immediately notify the teacher. 4. You notice a small puddle of clear liquid on your lab bench that you didn't put there. How should you handle this?
A. Smell the liquid to see if it is just water. B. Dip your finger in it to check the texture. C. Treat it as a hazard and inform your teacher before touching it. D. Wipe it up with a paper towel immediately. 5. A student accidentally splashes a chemical into their eyes. They should immediately go to the eyewash station and flush their eyes for at least:
A. 30 seconds B. 15-20 minutes C. 5 minutes D. 2 minutes 6. While cleaning up, you find a beaker filled with a blue liquid that has no label. What is the correct way to dispose of it?
A. Ask the teacher for specific disposal instructions. B. Leave it on the counter for the next class to use. C. Pour it down the sink with plenty of water. D. Pour it back into the original chemical container.

Scientific Method and Experimental Design

1. A student looks at a plant and says, 'The leaves are turning brown, so the plant must not be getting enough water.' Which part of the statement is an inference?
A. The plant must not be getting enough water. B. The leaves are turning brown. C. Both parts are inferences. D. Neither part is an inference. 2. True or False: 'The temperature of the water is 25°C' is a quantitative observation.
A. False B. True 3. Which of the following is the best example of a testable scientific hypothesis?
A. If a plant is given more sunlight, then it will grow taller than a plant in the shade. B. Dogs make better pets than cats because they are more loyal. C. Blue is the most beautiful color for a chemical reaction. D. The universe was created by a mysterious force that cannot be measured. Use the following scenario for the next three questions:
A student wants to know if the type of liquid (water, apple juice, or milk) affects how long it takes for an ice cube to melt. They place one identical ice cube into 100mL of each liquid. All liquids are at the same starting temperature (22°C).
4. In this experiment, what is the independent variable?
A. The time it takes for the ice to melt B. The type of liquid used C. The size of the ice cube D. The starting temperature of the liquids 5. In this experiment, what is the dependent variable?
A. The volume of liquid (100mL) B. The type of liquid used C. The time it takes for the ice to melt D. The brand of apple juice 6. Which of the following must be kept as a controlled variable (constant) to make this a fair test?
A. The results table B. The room temperature where the cups are placed C. The melting time D. The type of liquid 7. A scientist conducts an experiment once and gets a result that supports their hypothesis. Why is it important to perform repeated trials?
A. To make the experiment take longer. B. To change the hypothesis if the results are boring. C. Because the teacher says so. D. To ensure the results are consistent and not due to chance or error. Examine the data table below:
Fertilizer Type
Average Height (cm)
Brand A
12.4
Brand B
15.1
Brand C
10.8
Control (No Fertilizer)
9.5
8. Based on the results in the table, which conclusion is best supported?
A. Brand C is the most effective fertilizer. B. Brand B resulted in the most growth compared to the other groups. C. All fertilizers are equally effective. D. Plants do not need fertilizer to grow. 9. A student wants to test if music affects plant growth. They put a tomato plant in a room with rock music and a sunflower in a room with classical music. What is the major flaw in this experimental design?
A. The experiment didn't last long enough. B. They played different genres of music. C. They didn't use a fertilizer. D. They used two different types of plants.