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6.1 Sugar Lab

Last updated over 3 years ago
10 questions
1

DO NOW: Today we will be doing a lab in class. Read the scenerio below and make a hypothesis.

Experiment 1. Temperature

Predict: If food dye is dropped in ice water, room temp water, and hot water, which will disperse the fastest? If you are struggling to create a hypothesis, feel free to use the "If... then... because..." technique.

Protocol-

1. In one plastic beaker, gather 100mL of ice water. In a second plastic beaker, collect 100mL of room temp water from the sink. In a third GLASS beaker, collect 100mL of water from the sink then place the beaker on a hot plate. Turn the hot plate on high.

2. Once the third beaker starts to steam and becomes visably hot, remove the beaker from the hot plate with tongs. DO NOT TOUCH THE HOT GLASS.

3. Place all 3 beakers side by side and place 3 drops of food coloring in each beaker at the same time. Write your observations in the table below. Pay attention to the time it takes for the food coloing to disperse.
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Observations:
You can use pictures and words to describe your observations.

Research:
Read the research below and then complete the conclusion in question 3.

What is collision theory?

Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.
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Conclusion: Do you observations match your predictions? Using collision theory, explain why hot water usually disperses food dye faster.

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Experiment 2. Concentration

Predict: If 5 drops of food dye and 3 drops of food dye are dropped in equal amounts of room temperature water, which will disperse the fastest? Use the format "If... then... because..." to make your hypothesis.

Protocol:
Rinse out your 2 plastic beakers from experiment 1.

Fill each plastic beaker with 100 mL of room temperature water.

At the same time, place 3 drops of food coloring in 1 beaker and 5 drops of food coloring in a second beaker. Record your observations in the table below.
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Observations:
Use drawings and words to explain your observations.

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Conclusion: Do you observations match your predictions? Using collision theory, explain why you think more drops of food dye generally disperses faster.

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Part 3. Surface Area

Predict: If a sugar cube and granulated sugar are placed equal amounts of water with moderate stirring, which will dissolve fastest? Use the format "If... then... because..." to make your hypothesis.

Protocol:

Clean out your 2 plastic beakers from experiment 2. Fill each beakers with 100mL of room temperature water from the sink.

In 1 beaker, place 1 sugar cube and in another beaker, use a spoon to measure out approximately the same amount of sugar.

Use a string rod to gently stir each beaker. Try to stir at the same speed and same amount in each beaker.
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Observations:

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Sources of error:
What are some possible sources of error in the sugar experiment. Think of at least 2.

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Conclusion: Do you observations match your predictions? Using collision theory, explain why granulated sugar usually dissolves faster than a sugar cube.