C5 C10 Metal Reactivity and Extraction

What is the correct equation when potassium reacts with water?

• 2K (s) + H₂O (l) -->  KOH (aq) + H₂ (g)
• K (s) + 2H₂O (l) -->  KOH (aq) + 2H₂ (g)
• 2K (s) + 2H₂O (l) -->  2KOH (aq) + H₂ (g)
• K (s) + H₂O (l) -->  KOH (aq) + H₂ (g)

Which of the following is arranged according increasing reactivity?

• Mg > Li > Na > K
• Mg > Na > Li > K
• Na > Li > Mg > K
• K > Mg > Na > Li

Which of the following does not react with water?

• lithium
• magnesium
• lead
• calcium

What is made when magnesium reacts with hydrochloric acid?

• magnesium nitrate and hydrogen gas
• magnesium sulfate and hydrogen gas
• magnesium oxide and oxygen gas
• magnesium chloride and hydrogen gas

The least reactive in oxygen in the list is 

• iron
• zinc
• copper
• lead

Which one of the following metals reacts most vigorously with cold water?

• Sodium
• Magnesium
• Copper
• Zinc

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which one of the following metals could produce zinc metal, if heated with zinc oxide?

• Copper
• Aluminium
• Iron
• Silver

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these reactions is possible? 

• Zn (s) + CuO (aq) --> ZnO (aq) + Cu (s)
• Cu (s) + FeSO₄ (aq) --> CuSO₄ (aq) + Fe (s)
• Pb (s) + ZnCl₂ (aq) --> PbCl₂ (a) + Zn (s)
• Au (s) + 2HCl (aq) --> AuCl₂ (aq) + H₂ (g)

Which metal is more reactive than calcium?

• magnesium
• potassium
• silver
• aluminum

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What will be reaction if less reactive metal is added in a solution with more reactive metal compound?

• vigorous reaction
• fizzing gas produced
• burns moderately
• no reaction