Quiz #1 Chemistry

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A scientist wants to see the effect of fertilizer on plant growth. She plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the growth of the corn over the course of 5 months.

What is the independent variable?

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What is the dependent variable?

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Name one constant in this experiment.

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What is the control?

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Two students are arguing over whether or not air is matter. They both argue different claims.

Student 1's claim: "Air is not matter because we cannot feel it or touch it like we can solids and liquids. It is too small and invisible. We have to be able to see matter and interact with it."

Student 2's claim: "Air is matter. We know this because it is a gas and has mass and volume. Being able to see it isn't a defining feature of matter."

Which claim do you agree with?

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What evidence is there in the video supporting the claim? Remember that evidence comes from things we can see or data from a lab.

Check all that apply. There could be more than ONE.

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Using your knowledge of matter, write two sentences that reasons out the evidence. In other words, why is this evidence important? How does it relate to the scientific concept of matter?

You can start your reasoning with, "I think this evidence relates to the idea of matter because..." if it helps.

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A piece of solid butter is placed in a pan on a stove and gently heated, causing thermal energy to transfer to the butter until the state of the butter changed.

Predict the change in the state of solid butter.

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Construct a model that shows the butter particles before and after thermal energy is transferred to the solid butter by heating.

Be sure your model includes pictures and a key to show the thermal energy and kinetic energy of the motion of the particles. Think about all of the requirements of our phase change models.

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Write a description of what your model shows. In your description, explain how the state of the solid butter changes after thermal energy is transferred to butter by heating.

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There is a solid wooden table with a cup of water sitting on it. Which of the following statements is TRUE?

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Anna and Carla were each asked to draw a model to show why water and iodine are different substances. Anna thought that her model should show water and iodine at the particle level. Carla thought her model should show water and iodine at the molecular level.

Based on what you know about substances, whose model best shows why water and iodine are different substances?

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Explain why you chose this model.

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What is the dependent variable?

Name one constant in this experiment.

What is the control?

What evidence is there in the video supporting the claim? Remember that evidence comes from things we can see or data from a lab.

Check all that apply. There could be more than ONE.

Using your knowledge of matter, write two sentences that reasons out the evidence. In other words, why is this evidence important? How does it relate to the scientific concept of matter?

You can start your reasoning with, "I think this evidence relates to the idea of matter because..." if it helps.

A piece of solid butter is placed in a pan on a stove and gently heated, causing thermal energy to transfer to the butter until the state of the butter changed.

Predict the change in the state of solid butter.

Write a description of what your model shows. In your description, explain how the state of the solid butter changes after thermal energy is transferred to butter by heating.

There is a solid wooden table with a cup of water sitting on it. Which of the following statements is TRUE?

Explain why you chose this model.

Explain why the other model does not work.

Element

Compound

Mixture of elements

Mixture of compounds

Mixture of compounds and elements

Only atoms, no molecules

Only molecules, no separate atoms

Both atoms and molecules

Quiz #1 Chemistry

What is the dependent variable?

Name one constant in this experiment.

What is the control?

What evidence is there in the video supporting the claim? Remember that evidence comes from things we can see or data from a lab.Check all that apply. There could be more than ONE.

Using your knowledge of matter, write two sentences that reasons out the evidence. In other words, why is this evidence important? How does it relate to the scientific concept of matter?You can start your reasoning with, "I think this evidence relates to the idea of matter because..." if it helps.

A piece of solid butter is placed in a pan on a stove and gently heated, causing thermal energy to transfer to the butter until the state of the butter changed.Predict the change in the state of solid butter.

Write a description of what your model shows. In your description, explain how the state of the solid butter changes after thermal energy is transferred to butter by heating.

There is a solid wooden table with a cup of water sitting on it. Which of the following statements is TRUE?

Explain why you chose this model.

Explain why the other model does not work.

Element

Compound

Mixture of elements

Mixture of compounds

Mixture of compounds and elements

Only atoms, no molecules

Only molecules, no separate atoms

Both atoms and molecules

What evidence is there in the video supporting the claim? Remember that evidence comes from things we can see or data from a lab.

Check all that apply. There could be more than ONE.

A piece of solid butter is placed in a pan on a stove and gently heated, causing thermal energy to transfer to the butter until the state of the butter changed.

Predict the change in the state of solid butter.