Exploring Matter and Chemical Reactions

What is the main difference between an element and a compound?

• Elements are made of different types of atoms, while compounds are made of the same type of atom.

• Elements are pure substances, while compounds are mixtures.

• Elements are made of one type of atom, while compounds consist of two or more types of atoms chemically bonded.

• Elements can be broken down into simpler substances, while compounds cannot.

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DOK Level 2: Skill/Concept

Which property of water allows insects to walk on its surface?

• Adhesion

• Cohesion

• Surface tension

• Capillary action

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DOK Level 1: Recall

When cohesion and adhesion work together to carry water up a tube or plant stem, it is called

• polarity

• adhesion

• capillary action

• surface tension

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DOK Level 1: Recall

What is the pH of a neutral solution?

• 0

• 7

• 14

• 1

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DOK Level 1: Recall

Compare the properties of acids and bases in terms of their pH levels.

• Acids have a pH greater than 7, while bases have a pH less than 7.

• Acids have a pH less than 7, while bases have a pH greater than 7.

• Both acids and bases have a pH of 7.

• Acids and bases have the same pH range.

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DOK Level 2: Skill/Concept

In a chemical reaction, the mass of the reactants is 50 grams. What should be the mass of the products?

• 25 grams

• 50 grams

• 75 grams

• 100 grams

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DOK Level 1: Recall

Explain how the conservation of mass is demonstrated in the chemical equation for photosynthesis.

• The mass of carbon dioxide and water is greater than the mass of glucose and oxygen produced.

• The mass of glucose and oxygen produced is greater than the mass of carbon dioxide and water.

• The mass of carbon dioxide and water is equal to the mass of glucose and oxygen produced.

• The mass of reactants and products cannot be compared in photosynthesis.

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DOK Level 2: Skill/Concept

• 2

• 8

• 12

• 4

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DOK Level 1: Recall

• 6

• 12

• 18

• 24

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DOK Level 2: Skill/Concept

Which of the following is a characteristic property of bases?

• Sour taste

• Slippery feel

• Reacts with metals to produce hydrogen gas

• Turns blue litmus paper red

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DOK Level 1: Recall