Unit 2 Test Review

In chemical formulas, what do the tiny numbers (subscripts) represent?

• The number of molecules

• The number of atoms of the element

• The number of chemical reactions

• The number of products formed

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NGSS.MS-PS1-1

According to the chemical equation in the diagram, how many molecules of water are produced?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many atoms of Hydrogen are in the formula 5H₂?

• 2

• 5

• 10

• 15

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NGSS.MS-PS1-1

How many atoms of Sodium (Na) are there in the chemical formula 2Na₂SO₄?

• 2

• 4

• 6

• 8

Tags

NGSS.MS-PS1-1

How many atoms of Sulfur (S) are there in the chemical formula 2Na₂SO₄?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many atoms of Oxygen (O) are there in the chemical formula 2Na₂SO₄?

• 4

• 8

• 12

• 16

Tags

NGSS.MS-PS1-1

How many oxygen atoms are there in the reactants of the chemical equation shown?

• 2

• 4

• 1

• 3

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Is the chemical equation 2Fe₂O₃ + 3C → 4Fe + 3CO₂ balanced?

• Yes, it is balanced.

• No, there are more carbon atoms on the reactant side.

• No, there are more oxygen atoms on the product side.

• No, there are more iron atoms on the product side.

Tags

NGSS.MS-PS1-5

Is the chemical equation Br + 3Li₂ → LiBr₂ balanced?

• Yes, it is balanced.

• No, there are more lithium atoms on the reactant side than the product side.

• No, there are more bromine atoms on the product side than the reactant side.

• No, there are more lithium atoms on the product side than the reactant side.

Tags

NGSS.MS-PS1-5

Click on the reactants coefficient.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5