Chapter 7 Chemical Reaction

What kind of reaction occurs when potassium is placed in water? 

• a single-displacement reaction 

  
  

• a double-displacement reaction

• a decomposition reaction

• electrolysis

All of the following factors may speed up a chemical reaction except

• smaller surface area.

• higher pressure.

• higher temperature.

• presence of catalyst.

Which of the following are the products and reactants of a chemical reaction most likely to have in common?

• atoms

• molecules

• physical properties

• chemical properties

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NGSS.MS-PS1-2

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Which of the following occurs when gasoline is burned?

• New elements are formed.

• New atoms are formed.

• New molecules are formed.

• All of the above

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NGSS.MS-PS1-5

What coefficient is missing in C₂H₄ + (?)O₂ → 2CO₂ + 2H₂O?

• 2

• 3

• 4

• 5

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NGSS.MS-PS1-5

Which of the following equations is not balanced?

• Fe + S→ FeS

• KOH + HCl → KCl + H₂O

• 2Mg + O2 → 2MgO

• NaCl + H₂SO₄ → Na₂SO₄ + HCl

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NGSS.MS-PS1-2

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The decomposition of water can be brought about by

• combustion.

• electrolysis.

• synthesis reactions.

• oxidation.

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NGSS.MS-PS1-2

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Which of the following represents a double-displacement reaction between sodium chloride and silver 

fluoride? 

• NaCl + AgF→ NaAgF + Cl₂

• NaCl + AgF → NaF + AgCl

• NaCl + AgF → Ag + NaClF

• NaCl + AgF → NaF + Cl₂ + Ag 

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NGSS.MS-PS1-2

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Pieces of molecules that have one or more electrons available for bonding are

• radicals.

• reactants.

• neutrons.

• protons.

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NGSS.HS-PS1-1

A synthesis reaction between magnesium (Mg) and oxygen (O2) might produce

• Mg₂

• O₄

• MgO

• MgCO₂

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5