Unit 2 Review- 8th Grade

According to the Chemical Compounds table, how many atoms of hydrogen are in glucose?

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NGSS.MS-PS1-1

According to the Chemical Compounds table, how many atoms are in Ethanol?

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NGSS.MS-PS1-1

According to the Chemical Compounds table, how many total elements are in Methane?

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NGSS.MS-PS1-1

In the equation below, how many atoms are there of Carbon on the product side of the equation?

CH₄+ O₂ → CO₂ ​+ 2H₂​O

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NGSS.MS-PS1-1

If given a chemical formula, which information could be determined?

• The structural arrangement of the atoms in the molecule

• The number of atoms of each element in the molecule

• The color of the molecule

• The size of the molecule

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NGSS.MS-PS1-1

Which of the following statements are true? (Hint: there can be more than one correct answer)

• Chemical formulas are used to identify substances

• Subscripts are used to identify substances

• Coefficients are used to identify substances

• The elements and the number of atoms of each element present in a chemical formula are used to identify substances.

• There is no way to identify a substance

Which of the following formulas contain the same number of hydrogen atoms?

• Formulas I and III

• Formulas I, III, and IV

• Formulas II, III, and V

• Formulas I and V

How many atoms are in one molecule of sulfuric acid, H₂SO₄?

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NGSS.MS-PS1-1

The chemical formula represents the substance vinegar.

5CH₃COOH

How many molecules of vinegar are represented?

Which substances form due to a chemical reaction?

• Mass

• Reactants

• Products

• Atoms

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NGSS.MS-PS1-2

NGSS.MS-PS1-5