Unit 2 Pre-Assessment

• 1

• 2

• 4

• 6

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DOK Level 1: Recall

• 4

• 7

• 12

• 3

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DOK Level 2: Skill/Concept

According to the Law of Conservation of Mass, which of the following statements is true?

• Mass can be created and destroyed.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass is always lost in a chemical reaction.

• Mass is always gained in a chemical reaction.

Tags

DOK Level 1: Recall

• Because the number of hydrogen and oxygen atoms are the same on both sides of the equation.

• Because the number of molecules is the same on both sides of the equation.

• Because the mass of the reactants is greater than the mass of the products.

• Because the mass of the products is greater than the mass of the reactants.

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DOK Level 3: Strategic Thinking

• 3

• 4

• 5

• 6

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DOK Level 2: Skill/Concept

• 46 grams

• 71 grams

• 117 grams

• 142 grams

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DOK Level 3: Strategic Thinking

Which of the following compounds contains the most oxygen atoms?

• CO₂

• H₂O

• SO₂

• Al₂(SO₄)₃

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NGSS.MS-PS1-1

Which of the following compounds has the highest number of hydrogen atoms?

• H₂O

• CH₄

• C₂H₆

• NH₃

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NGSS.MS-PS1-1

How many oxygen atoms are present in one molecule of glucose (C₆H₁₂O₆)?

• 3

• 6

• 12

• 18

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NGSS.MS-PS1-1

Which of the following equations is balanced according to the Law of Conservation of Mass?

• H₂ + O₂ → H₂O

• 2H₂ + O₂ → 2H₂O

• H₂ + O₂ → 2H₂O

• 2H₂ + 2O₂ → 2H₂O

Tags

NGSS.MS-PS1-5