Chemical Reactions

Using the activity series, predict which of the following reactions can occur.

• 2Cr(s) + SnCl₄(aq)
• Na(s) + KBr(aq)
• 2Na(s) + CdCl₂
• Two of these can occur

Using the activity series, determine which of the following reactions is possible.

• Cr + SnCl₄
• Na + KBr
• Na + CdCl₂
• two of these can occur
  

Tags

NGSS.HS-PS1-1

The equation H₃PO₄ + 3KOH → K₃PO₃ + 3H₂O is an example of which type of reaction?

• double-replacement reaction
• decomposition reaction
• single-replacement reaction
• combination reaction

What will be the result of the reaction described by the following chemical equation? PCl₅(g) ↔ PCl₃(g) + Cl₂(g)     
           

• a mixture of PCl₃(g) and Cl₂(g) only
• PCl₅(g) only
• a mixture of PCl₅(g) and PCl₃(g) only
• a mixture of PCl₅(g), PCl₃(g), and Cl₂(g)

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What are the correct formulas and coefficients for the products of the following double-replacement reaction? RbOH + H₃PO₄ -->

• H₃Rb + PO₄OH
• Rb₃PO₄ + 3H₂O
• RbPO₄ + 2H₂O
• Rb(PO₄) _{3 +} H₂O

Tags

NGSS.HS-PS1-7

When a slightly soluble solid compound is produced in a double-displacement reaction, a

• combustion reaction takes place.
• halogen is produced.
• gas bubbles off
• precipitate is formed.

When the equation Fe +Cl→ FeCl is balanced, what is the coefficient for Cl?

• 1
• 3
• 4
• 2

Tags

NGSS.HS-PS1-7

You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?

• Solution A, solution B, and the mixture are all yellow.
• The beaker becomes warm.
• You see gas bubble out of solution
• None of the above; all help prove that a chemical reaction has occurred.

Which of the following equations represents the balanced equation for the reaction of iron and oxygen?

• 2Fe  O₂ → Fe₂O₃
• Fe  3O₂ → Fe₂O₃
• 3Fe  3O₂ →2Fe₂O₃
• 4Fe  3O₂ → 2Fe₂O₃

Tags

NGSS.HS-PS1-7

a reaction in which a single compound is broken down into simpler substances

• activity series of metals
• single-replacement reaction
• combustion reaction
• decomposition reaction