Mod J Unit 3 Lesson 2 - Chemical Processes and Equations

Which of these is the chemical formula for the substance?

• Al₂SO₄

• Al₂(SO₃)₄

• Al₂(SO₄)₃

• (AlO)₂(SO₄)₃

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NGSS.MS-PS1-1

Zinc and hydrochloric acid are combined in a test tube. What can you conclude about the chemical reaction? (Click all that apply)

• The mass of the products is equal to the mass of the reactants.

• One new product formed is a gas.

• Molecules are changing into different atoms.

• Atoms are changing into different atoms.

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NGSS.MS-PS1-5

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Zinc and hydrochloric acid are combined and forms zinc chloride and hydrogen gas. Which of these correctly balanced equation that models the reaction?

• Zn + HCl --> ZnCl₂ + H₂

• Zn + 2HCl _-> ZnCl₂ + 2H₂

• Zn + 2HCl --> ZnCl₂ + H₂

• Zn + 4HCl --> ZnCl₂ + 2H₂

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What is shown by this balanced equation? Click all that apply.

• The atoms in the original substances regroup and form a different substance.

• The product is a new substance made up of different atoms than the reactants.

• The total number of atoms changes in the reaction.

• The same atoms are present before and after the reaction.

• Matter is conserved.

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NGSS.MS-PS1-5

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How many oxygen (O) atoms are involved in this chemical reaction?

• 2

• 3

• 6

• 12

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NGSS.MS-PS1-2

When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which 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-PS1-5

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Which number completes the balanced chemical equation for rusting?

4Fe + 3O₂ --> ____ Fe₂O₃

• 1

• 2

• 4

• 12

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NGSS.MS-PS1-5

Ethane ( C2H6) burns in oxygen to form carbon dioxide and water.

2C₂H₆ + 7O₂ --> 4CO₂ + 6 H₂O

Which is a product in this reaction?

• carbon (C)

• oxygen (O)

• water (H₂O)

• ethane (C₂H₆)

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NGSS.MS-PS1-5

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Based on these equations, which statement is correct?

3NaOH + H₃PO₄ --> Na₃PO₄ + 3H₂O

2Mg + O₂ --> 2MgO

Pb(NO₃)₂ + 2NaI --> PbI₂ + 2NaNO₃

• MgO is a reactant in one of the reactions

• Na₃PO₄ is a product in one of the reactions

• A total of 5 oxygen atoms are in the 1st reaction

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

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NGSS.MS-PS1-1

Based on these equations, which statement is correct?

3NaOH + H₃PO₄ --> Na₃PO₄ + 3H₂O

2Mg + O₂ --> 2MgO

Pb(NO₃)₂ + 2NaI --> PbI₂ + 2NaNO₃

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

• Because Mg and O₂ are both elements, no bonds are 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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