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- A biology class wanted to study the effect of different materials on the melting rate of ice. They placed pieces of ice, each with a mass of 10g, onto trays. Group 1 was covered in plastic, group 2 was covered in paper, group 3 was covered in aluminum, and group 4 remained uncovered. Each piece of ice was allowed to melt for 15 minutes. Then final mass of the ice, minus the melted water, was recorded at the end of the experiment. Which of the following is the control group in this experiment? Choose 1 answer: Choose 1 answer: (Choice A) A Group 1 (Choice B) B Group 4 (Choice C) C Group 3 (Choice D) D Group 2According to Aristotle’s rules, which of the following objects would be suitable for scientific inquiry? a brightly colored snake with one head B. a stationary object with a density of 0 grams/cm3 a moving object with infinite velocity a brightly colored snake with two heads a distant star that burns eternallyYou are studying the effect of different drinks on tooth enamel. In your experiment you place pieces of chalk in different drinks to record the time it takes for the chalk to completely dissolve A. Identify the dependent variable B. Identify the independent variable C. List two constants
- According to Aristotle’s rules, which of the following objects would be suitable for scientific inquiry? a brightly colored snake with one head B. a stationary object with a density of 0 grams/cm3 a moving object with infinite velocity a brightly colored snake with two heads E. a distant star that burns eternallyWhich of the following are scientific statements? Choose all that apply. A Liquid water always has a higher density than frozen water (ice ). B Matter is filled with undetectable particles CM&M candies contain no sugar D We will never know what is happening inside a black hole E All dogs go to heaven.Why is it important to select a good stationary phase? a) To retain the desired molecules and separate them from the rest of the sample b) To create a good flow path through the system ) To detect all the molecules in the sample at the same time d) To ensure the sample remains properly mixed
- What do you call the smallest unit of particle in the universe? a. Cell b. Atom c. Nucleus d. MatterIf water molecules are like magnets, why do you think frozen water molecules don't pull toward each other? do you think it has anything to do with how close together the molecules are?When you mix salad oil and water, they immediately separate because ___. A. salad oil is a nonpolar substance that repels water molecules B. salad oil is a nonpolar substance that have is attracted to water molecules C. salad oil is a polar substance that is attracted to water molecules D. salad oil is a polar substance that repels water molecules
- Which two statement about the substances in this experiment are true? A. Chalk is harder than quartz. B. Isopropyl alcohol boils more easily than vegetable oil. C. Water has a higher surface tension than soapy water. D. Saltwater has a higher surface tension than plain water.Casein in milk is an example of: a. gas in liquid where liquid is the dispersed phase and gas is the continuous phase b. solid in liquid where the liquid is the dispersed phase and the solid is the continuous phase c. solid in liquid, where solid is the dispersed phase and liquid is continuous phase d.gas in liquid where gas is dispersed phase and liquid is continuous phaseYou are designing an experiment to test the reaction of potato samples with varying amounts of surface area with equal amounts of hydrogen peroxide. In your experiment, you have two (2) small test tubes, labeled A and B respectively and each filled with 10 ml of hydrogen peroxide. A 1 cm3 cube of potato will be placed into Test Tube A. In Test Tube B, the same volume of potato (1 cm3) will be placed into this test tube, but this cube of potato will be cut into 8 pieces before being dropped into Test Tube B. After 5 minutes, which of the test tubes do you predict will show a greater amount of chemical reaction (the releasing of oxygen gas as seen through fizzing) between the potato sample containing the enzyme catalase and the hydrogen peroxide? Why?
