U6 Chemical Reactions

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.HS-PS1-7

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the a dark solid formed on the zinc.

The student inferred that a chemical reaction occurred. What evidence supports this claim?

• A dark solid formed on the zinc metal.

• The zinc metal remained silver-colored and shiny

• The CuSO₄ solution turned blue when the zinc metal was added.

• None of these

Tags

NGSS.HS-PS1-2

All of the following reactions are correctly balanced except-

• A
• B
• C
• D

Tags

NGSS.HS-PS1-7

How many Al atoms are in this compound? 4Al₂O₃

• 2

• 8

• 6

• 4

Tags

NGSS.MS-PS1-1

Identify this type of reaction,

Cl₂ + 2KBr _--> Br₂ + 2KCl

• Synthesis

• Single displacement

• Double displacement

• Decomposition

What type of reaction is this?

2 C₅H₅ + Fe --> Fe(C₅H₅)₂

• single displacement

• double displacement

• decomposition

• synthesis

What type of reaction is this?

NO₂ →N₂ + O₂

• Synthesis (combination)

• Decomposition

• Single replacement

• Combustion

During Photosynthesis energy is absorbed from the sun into the reaction. What kind of reaction is it?

• Physical

• Exothermic

• Endothermic

• Photothermic

Tags

NGSS.HS-LS1-5

What type of reaction is shown in image?

• exothermic reaction

• endothermic reaction

• single displacement reaction

• double displacement reaction

Tags

NGSS.HS-PS1-4

Which of the following will increase the rate of a reaction?

• raising the temperature of reactants
• grinding the reactants into a powder
• increasing the concentration of reactants
• all of the above

Tags

NGSS.HS-PS1-5