HMH Unit 4 Chemical Processes and Equations

When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?

• The ash has less volume than the paper.

• Some of the matter is destroyed during the reaction.

• The mass of the ash cannot be accurately determined.

• Some of the products of the reaction were given off as a gas.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ethane (C₂H₆) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation.

2C₂H₆ + 7O₂ --> 4CO₂ + 6H₂O

Which substance is a product in this reaction?

• Carbon (C)

• Oxygen (O)

• Water (H₂O)

• ethane (C₂H₆)

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NGSS.MS-PS1-1

Solid magnesium, Mg, reacts with oxygen gas, O₂, to for mthe solid magnesium oxide, MgO. Which is a balanced chemical equation for this reaction?

• Mg + O --> MgO

• Mg + O₂ --> MgO₂

• Mg + 2O --> 2MgO

• 2Mg + O₂ --> 2MgO

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

When coal is burned, sulfur is released into the air, where it reacts with oxygen to product sulfur dioxide and sulfur trioxide. Which of these is true of this process?

• The identity of each reactant remains the same

• Sulfur dioxide and sulfur trioxide are the reactants in this change

• The products have different chemical properties than those of the reactants

• The products contain more sulfur atoms and fewer oxygen atoms than the reactants

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which number completes the balanced chemical equation showing the process of rusting?

4Fe + 3O₂ --> __Fe₂O₃

• 1

• 2

• 4

• 12

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NGSS.MS-PS1-5

Based on the equations, which statement is correct?

• MgO is a reactant in one of the chemical reactions.

• Na₃PO₄ is a product in one of the chemical reactions.

• A total of five oxygen atoms are involved in the first reaction.

• H₃PO₄ shows that three atoms of oxygen are involved in the reaction

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these statements is true?

• Mass is lost when 2MG and O₂ become 2MgO

• Because Mg and O₂ are both elements, no bonds were broken during the formation of MgO

• The chemical properties of Pb(NO₃)₂ and NaI differ from the chemical properties of PbI₂ and NaNO₃

• The chemical properties of NaOH and Na₃PO₄ are similar, and the chemical properties of H₃PO₄ and H₂O are similar

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NGSS.MS-PS1-2

NGSS.MS-PS1-5