Unit 9.2- Matter

Which of the following best describes the difference between a mixture and a pure substance?

• A mixture contains only one type of atom, while a pure substance contains multiple types of atoms.

• A mixture can be separated into its components by physical means, while a pure substance cannot.

• A pure substance can be separated into its components by physical means, while a mixture cannot.

• A mixture is always a liquid, while a pure substance is always a solid.

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DOK Level 1: Recall

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Explain how the atomic theory has evolved over time and why scientific theories may be modified but rarely discarded.

• The atomic theory has remained unchanged since its inception.

• The atomic theory has been modified as new evidence has been discovered, showing that scientific theories are refined over time.

• Scientific theories are discarded when new evidence is found, which is why the atomic theory is no longer used.

• The atomic theory was discarded in favor of the theory of relativity.

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DOK Level 3: Strategic Thinking

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Compare the properties of acids and bases.

• Acids taste bitter and turn red litmus paper blue, while bases taste sour and turn blue litmus paper red.

• Acids taste sour and turn blue litmus paper red, while bases taste bitter and turn red litmus paper blue.

• Acids and bases both taste sour and turn litmus paper the same color.

• Acids and bases both taste bitter and turn litmus paper the same color.

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DOK Level 2: Skill/Concept

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Describe the motion of particles in a gas compared to a solid.

• Particles in a gas are tightly packed and vibrate in place, while particles in a solid move freely and rapidly.

• Particles in a gas move freely and rapidly, while particles in a solid are tightly packed and vibrate in place.

• Particles in a gas and a solid both move freely and rapidly.

• Particles in a gas and a solid are both tightly packed and vibrate in place.

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DOK Level 2: Skill/Concept

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Why is the atomic theory considered a scientific theory and not a law?

• Because it is a guess and not based on evidence.

• Because it explains observations and can be modified with new evidence, unlike laws which describe phenomena.

• Because it is a law that has been proven false.

• Because it is not widely accepted by scientists.

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DOK Level 3: Strategic Thinking

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Identify the compound from the following list.

• Sodium (Na)

• Chlorine (Cl)

• Sodium chloride (NaCl)

• Oxygen (O)

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DOK Level 1: Recall

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How can you distinguish between a solution and a pure substance?

• A solution is always a solid, while a pure substance is always a liquid.

• A solution can be separated into its components by physical means, while a pure substance cannot.

• A pure substance can be separated into its components by physical means, while a solution cannot.

• A solution is a type of mixture, while a pure substance has a fixed composition.

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DOK Level 2: Skill/Concept

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What is the primary reason scientific theories, such as the atomic theory, are modified over time?

• New evidence and discoveries that provide a better understanding of the natural world.

• Theories are based on opinions and change with popular belief.

• Theories are discarded every few years to make room for new ideas.

• Theories are modified to align with laws.

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DOK Level 3: Strategic Thinking

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Explain how the finite number of elements can form a multitude of compounds.

• Elements can only form a limited number of compounds due to their fixed properties.

• Elements can combine in various ways to create a vast number of compounds.

• Elements cannot form compounds; they exist only in their pure form.

• Elements can only form compounds with similar elements.

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DOK Level 2: Skill/Concept

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Which of the following best describes a pure substance?

• A material composed of two or more different elements or compounds.

• A material with a uniform and definite composition.

• A material that can be separated into its components by physical means.

• A material that changes its composition when mixed with another substance.

Tags

DOK Level 1: Recall

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