Chemistry
Chemistry, 12.11.2019 10:31, vorhees2406

Determine what the experimental variable is. how does salt change the freezing temperature of water? ​

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Chemistry, 29.07.2019 05:30, OinkFred
Janet learned in science class that the amount of salt that can dissolve in a certain amount of water depends on the temperature of the water. she decides to do an experiment to test this. she carefully adds salt, 100 mg at a time, to a cup of water and stirs until all the salt dissolves. when she has added so much salt that it will not dissolve after 5 minutes, she measures the temperature of the water. she records the temperature and the final amount of salt. she does this with cold water, cool water, room-temperature water, warm water, and hot water. what is the test variable (independent variable) in this experiment?
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Biology, 31.07.2019 04:00, fireemblam101ovu1gt
Susie places 3 beakers in the freezer. the first beaker contains water only, the second contains water and salt, and the third contains a water and sugar solution. susie recorded the temperature and the time at which each mixture froze. which is the most appropriate hypothesis for her experiment? a) salt affects the freezing point of water. b) the addition of salt raises the freezing point of water. c) the addition of a sugar lowers the freezing point of water. d) the addition of different substances affects the freezing point of water.
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Biology, 09.09.2019 22:20, ariellewallenst3393
Astudent poses the question: how does the presence of dissolved salt affect the freezing point of water? to answer this question, the student set up two conditions. in the first condition, the student added salt to water in a container and referred to this condition as the variable. in the second condition, the student did not add any salt to water in a second container and referred to this condition as the control. the student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. would this be a valid experiment? a. yes, because there is more than one variable. b. yes, because there is one variable and a control c. no, because there is not more than one variable d. no because there is only one variable and a control
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Biology, 13.09.2019 08:20, 9826zed
Marla investigates the properties of an unknown, clear liquid that she thinks is water. she lowers the temperature of the liquid to the freezing point of water. the liquid does not become solid. marla is still convinced the unknown liquid is water. she wonders if the water may have salt in it. how would salt in the water explain her result? a. salt causes the water to evaporate. b. salt dissolves in water to it become a solid. c. salt lowers the freezing point of water. d. salt raises the temperature of the water.
Answers: 1
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Determine what the experimental variable is. how does salt change the freezing temperature of water?...

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