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Friday 10/17 - MM 1.8

Last updated 14 days ago
23 questions
MM 1.8 Evaluating Nanovision Models of Chromatography
Property: what you can observe or measure that describes chemicals
Separating ocean water - Ocean water is pumped through pipes, and then pushed through a filter with holes in it that are much too small to see. The tiny water molecules in the ocean water mixture are small enough to pass through the filter, but the atoms that make the water salty remain trapped. Only pure water comes out on the other side of the filter and this water is safe for people to drink.

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What property of the substances or molecules did scientists use to separate the salt water mixture.?

Scientists used ____________________ to separate the salt water mixture.

Separating the blood mixture - Blood is a mixture, and different parts of blood do different things. Plasma is the liquid part of blood. Scientists use the properties of the different parts of blood to separate the mixture. Plasma has the property of being liquid at room temperature, while the other parts of blood are solid at room temperature.

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💚 What property of the substances or molecules did scientists use to separate the blood mixture?

Sentence starter: Scientists used ____________________ property to separate the blood mixture.

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💚 Key Point: The properties of a substance are determined by the properties of its molecules.

What does our key concept help us understand about the properties of the molecules in the solid and liquid parts of blood?

Evaluating Nanovision Models of Chromatography
Evaluating Nanovision Models of Chromatography

Diagrams are also models because they help us understand something by making it simpler and easier to see. We’re going to evaluate three models of chromatography, which means to judge how useful or accurate each model is.

DIRECTIONS:
  • Read the information about each of the models we have used.
  • Then, read the statements that we know about molecules.
  • Finally, answer the questions about the different models to make a decision about whether the model is accurate or not.

Evaluate It!

Everything we know about molecules:

Statement A: All molecules of one substance are exactly the same, and they are different from molecules of any other substance.
Statement B: The properties of the molecules of a substance do not change.
COLOR CHANGING MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

As they passed through the food-coloring mixture, the water molecules bumped into the dye molecules, and the water molecules changed to the same colors as the dye molecules. The colored-water molecules kept traveling up the paper.The light blue molecules are the lightest, so they went the farthest. The red water molecules are the heaviest, so they did not go as far.
COLOR CHANGING MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.
As they passed through the food-coloring mixture, the water molecules bumped into the dye molecules, and the water molecules changed to the same colors as the dye molecules.

The colored-water molecules kept traveling up the paper.The light blue molecules are the lightest, so they went the farthest. The red water molecules are the heaviest, so they did not go as far.

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💚 Does the model explain how the water traveled up the paper?

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💚 Does the model explain how the colors moved up the paper?

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💚 Does the model explain why some colors went higher?

COLOR CHANGING MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.
As they passed through the food-coloring mixture, the water molecules bumped into the dye molecules, and the water molecules changed to the same colors as the dye molecules.

The colored-water molecules kept traveling up the paper.The light blue molecules are the lightest, so they went the farthest. The red water molecules are the heaviest, so they did not go as far.

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💚 Does the model fit with Statement A: All molecules of one substance are exactly the same, and they are different from molecules of any other substance.

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Explain your answer for question number 7

The color changing model (fits or does not fit) with statement A because ___________________

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💚 Does the model fit with Statement B: The properties of the molecules of a substance do not change.

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Explain your answer for question number 9

The color changing model (fits or does not fit) with statement B because ___________________

Growing Model
GROWING MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

As the water molecules passed through the food coloring, they attached to the dye molecules and made the dye molecules grow, so the dye traveled up the paper.

The molecules of blue dye grew the most, so they went the highest. The molecules of red dye grew less, so they did not go as high.
GROWING MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

As the water molecules passed through the food coloring, they attached to the dye molecules and made the dye molecules grow, so the dye traveled up the paper.

The molecules of blue dye grew the most, so they went the highest. The molecules of red dye grew less, so they did not go as high.

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💚 Does the model explain how the water traveled up the paper?

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💚 Does the model explain how the colors moved up the paper?

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💚 Does the model explain why some colors went higher?

GROWING MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

As the water molecules passed through the food coloring, they attached to the dye molecules and made the dye molecules grow, so the dye traveled up the paper.

The molecules of blue dye grew the most, so they went the highest. The molecules of red dye grew less, so they did not go as high.

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Does the model fit with Statement A: All molecules of one substance are exactly the same, and they are different from molecules of any other substance.

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Explain your answer for question number 14

The growing model (fits or does not fit) with statement A because ___________________

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Does the model fit with Statement B: The properties of the molecules of a substance do not change.

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Explain your answer for question number 16

The growing model (fits or does not fit) with statement B because ___________________

ATTRACTION MODEL - Independent Practice
ATTRACTION MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

The dye molecules were also attracted to the water molecules. Since they were attracted to the water molecules, the dye molecules got carried up the paper. At some point, the dye molecules were more attracted to the paper molecules than to the water molecules, so they stopped moving up.
ATTRACTION MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

The dye molecules were also attracted to the water molecules. Since they were attracted to the water molecules, the dye molecules got carried up the paper. At some point, the dye molecules were more attracted to the paper molecules than to the water molecules, so they stopped moving up.

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💚 Does the model explain how the water traveled up the paper?

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💚 Does the model explain how the colors moved up the paper?

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💚 Does the model explain why some colors went higher?

ATTRACTION MODEL

What happened to the dye and water molecules during chromatography?

The water molecules were attracted to the paper molecules, so the water molecules climbed up the paper.

The dye molecules were also attracted to the water molecules. Since they were attracted to the water molecules, the dye molecules got carried up the paper. At some point, the dye molecules were more attracted to the paper molecules than to the water molecules, so they stopped moving up.

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💚 Does the model fit with Statement A: All molecules of one substance are exactly the same, and they are different from molecules of any other substance.

Yes or No and explain why.

The attraction model (fits or does not fit) with statement A because ___________________

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💚 Does the model fit with Statement B: The properties of the molecules of a substance do not change.

Yes or No and explain why.

Yes the attraction model fits with statement B because ___________________

No the attraction model does not fit with statement B because ___________________

Reflection on Evaluations

Reflection on Evaluations

What have we learned?

Scientists evaluate models and change them when the models don’t fit with what they know.

When scientists evaluate models, they assess how accurate the models are based on what they know and the evidence they have.
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💚 Which model do you think is the most accurate - color changing, growing, or attraction model?