Reactions in Solution

What element is being Oxidized?

• N
• H
• O
• S

If an atom loses electrons during a chemical reaction, the atom was:

• Oxidized
• Reduced
• Neutralized
• Precipitated

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 is the oxidation number of N in NO₂^-1?

• -3
• +4
• -2
• +3

What are the spectator ions in this reaction?
CuCl₂(aq) + NaOH(aq) → Cu(OH)₂(s) + NaCl(aq)
 

• Cu²⁺ and OH^1-
• Na²⁺ and Cl^2-
• Na¹⁺ and Cl^1-
• Na¹⁺ and OH^1-

I have 25mL of 1M HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?

• 0.8 M
• 1 M
• 1.25 M

Which diagram best illustrates the ion-molecule attractions that occur when the ions of NaCl(s) are added to water?

• 1

• 2

• 3

• 4

As water is added to a 0.10 M NaCl aqueous solution, the conductivity of the resulting solution

• decreases because the concentration of ions decreases

• decreases, but the concentration of ions remains the same

• increases because the concentration of ions decreases

• increases, but the concentration of ions remains the same

Which of the following solutes will result in a solution with the strongest conductivity?

• 1.0 M C₆H₁₂O₆

• 1.0 M MgBr₂

• 2.0 M NaCl

• 2.0 M CaF₂

Which of the following are strong electrolytes? Choose all correct answers.

• NaCl

• CO₂

• HF

• H₂SO₄

• KOH