Unit 4- Changing Matter

Which of the following best describes the Law of Conservation of Mass?

• Mass is lost during a chemical reaction.

• Mass is conserved and remains constant during physical and chemical changes.

• Mass is created during a physical change.

• Mass is destroyed during a chemical change.

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DOK Level 1: Recall

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When ice melts into water, what type of change occurs?

• Chemical change

• Physical change

• Both physical and chemical change

• Neither physical nor chemical change

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DOK Level 1: Recall

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How does increasing temperature generally affect the rate of a chemical reaction?

• It decreases the rate of reaction.

• It has no effect on the rate of reaction.

• It increases the rate of reaction.

• It stops the reaction completely.

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DOK Level 1: Recall

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A student mixes vinegar and baking soda in a closed container and observes the mass before and after the reaction. What should the student conclude about the mass?

• The mass decreases because gas is produced.

• The mass increases because new substances are formed.

• The mass remains the same because of the Law of Conservation of Mass.

• The mass is unpredictable.

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DOK Level 2: Skill/Concept

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Which of the following is an example of a chemical change?

• Dissolving sugar in water

• Burning wood

• Melting butter

• Breaking glass

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DOK Level 2: Skill/Concept

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A student heats a substance and observes that it changes color and produces a gas. What type of change is most likely occurring?

• Physical change

• Chemical change

• No change

• Reversible change

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DOK Level 2: Skill/Concept

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Design an experiment to demonstrate the Law of Conservation of Mass using a simple chemical reaction. Describe the steps and the expected outcome.

• Mix baking soda and vinegar in an open container and measure the mass.

• Mix baking soda and vinegar in a closed container, measure the mass before and after the reaction, and observe that the mass remains constant.

• Heat water and measure the mass before and after heating.

• Dissolve salt in water and measure the mass before and after dissolving.

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DOK Level 3: Strategic Thinking

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Explain how you would differentiate between a physical change and a chemical change using an example.

• By observing the color change in a substance.

• By checking if the substance can be reversed to its original form.

• By measuring the temperature change during the process.

• By observing if a new substance is formed with different properties.

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DOK Level 3: Strategic Thinking

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A student observes that a metal rusts over time when exposed to air. What role does temperature play in this chemical change?

• Higher temperatures slow down the rusting process.

• Temperature has no effect on rusting.

• Higher temperatures speed up the rusting process.

• Lower temperatures stop rusting completely.

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DOK Level 2: Skill/Concept

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Predict what would happen to the rate of a chemical reaction if the temperature is decreased.

• The rate of reaction would increase.

• The rate of reaction would decrease.

• The rate of reaction would remain the same.

• The reaction would stop immediately.

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DOK Level 2: Skill/Concept

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