题目
CHM111L A Introduction to Lab Quiz
多重下拉选择题
The density of water at 21oC (room temperature) is 1.0 g/mL or 1.0 kg/L. If a material is less dense than water, it will float. If a material is more dense than water, it will sink. Consider the following household items. Determine if they will or will float or sink in water at 21oC. If you aren't sure, try it out for yourself! Then decide if the material is more or less dense than water. Household Item Toothpick: float Wood is [选择] less more dense than water. Ice: [选择] float sink Ice is [选择] more less dense than water. Penny: sink A penny is [选择] more less dense than water.
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标准答案
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思路分析
We are comparing whether common household items will float or sink in water at 21°C, based on the fact that water has a density of 1.0 g/mL (1.0 kg/L) and that substances less dense than water float while those more dense sink.
Toothpick: The first dropdown option is 'float'. A toothpick is made of wood and has a density less than water, so it should float. The alternative 'sink' would be incorre......Login to view full explanation登录即可查看完整答案
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类似问题
Clark steps outside on a winter North Dakota morning and throws a rock into the lake outside his tent. He sees that the rock does not sink. Clark forms a hypothesis about the behavior of rocks and water: The colder water is, the slower a rock will sink. Choose an experiment to best test this hypothesis. [ Select ] Get samples of water at a range of temperatures and place rocks of various sizes in each one. Verify if it will sink. Get samples of water at the same temperatures and place an identical rock in each one. Verify if it will sink. Get samples of water at a range of temperatures and place an identical rock in each one. Verify if it will sink. Get samples of water at the same temperatures and place rocks of various sizes in each one. Verify if it will sink. Predict whether this experiment will prove or disprove Clark’s hypothesis. [ Select ] Clark’s hypothesis indicating a continuous relationship would be disproved Clark’s hypothesis indicating a continuous relationship would be proved Clark’s hypothesis indicating a continuous relationship cannot be proved or disproved, If it would be disproved, what would be the revised hypothesis? Below 0°C, rocks do not sink in water.
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