Chemistry 20 Stoichiometry Exam

A solid produced during a chemical reaction is called

• an aqueous solution.

• sediment.

• solidification.

• a precipitate

What precipitate forms when you mix lead (II) nitrate with sodium chloride?

• sodium nitrate 
• lead (II) chloride 
• sodium lead
• chloride nitrate 

Tags

NGSS.HS-PS1-2

Which is the correct net ionic equation for the reaction of AgNO₃ and CaCl₂?

• Ca²⁺(aq) +  2Cl^- (aq) → CaCl(s)
• Ag⁺(aq)  +  Cl^- (aq) → AgCl(s)
• Ag +  Cl  →  AgCl
• Ag⁺  +  Ca²⁺   →Ag₂Ca (s)

What are the spectator ions in the reaction of sodium chloride with silver nitrate?

• silver and nitrate
• sodium and chloride
• sodium and nitrate
• silver and chloride

What are the spectator ions in this reaction?

CuCl₂(aq) + NaOH(aq) → Cu(OH)₂(s) + NaCl(aq)

• Cu²⁺ and OH^-

• Cu²⁺ and Cl^-

• Na⁺ and Cl^-

• Na⁺ and OH^-

N₂ (g) + 3H₂ (g) → 2NH₃ (g)

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 2

• 3

• 1

Cl₂ (g) + 2KBr (aq) → Br₂ (l) + 2KCl (s)

How many grams of potassium chloride can be produced from 356 g of potassium bromide?

• 749 g

• 223 g

• 479 g

• 814 g

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2
• 1,2,1,1
• 2,1,1,1
• 2,1,2,1

Tags

NGSS.HS-PS1-7

2Al (s) + 3H₂SO₄ (aq) -> Al₂(SO₄)₃ (s) + 3H₂ (g)

How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with excess aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.

Mg (s) + 2HCl (aq) --> MgCl₂ (aq) + H₂ (g)

• Mg

• H2

• MgCl2

• HCl