Double replacement and solubility rules

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   In FeCl₃ + 3 NaOH → Fe(OH)₃ + 3 NaCl, 2 units of Fe(OH)₃ form. How many spectator ions, Na⁺ and Cl⁻ together, stay dissolved, Ari?

   12 ions
2. 2.

   In FeCl₃ + 3 NaOH → Fe(OH)₃ + 3 NaCl, 5 units of Fe(OH)₃ form. How many spectator ions, Na⁺ and Cl⁻ together, stay dissolved, Bo?

   30 ions
3. 3.

   In FeCl₃ + 3 NaOH → Fe(OH)₃ + 3 NaCl, 4 units of Fe(OH)₃ form. How many spectator ions, Na⁺ and Cl⁻ together, stay dissolved, Esme?

   24 ions
4. 4.

   Which net ionic equation fits AgNO₃ + NaCl → AgCl + NaNO₃, Jun?

   • Na⁺ + NO₃⁻ → NaNO₃
   • Ag⁺ + Cl⁻ → AgCl
   • Ag⁺ + NO₃⁻ → AgNO₃
5. 5.

   Which net ionic equation fits the blue precipitate from copper(II) sulfate and sodium hydroxide, Luz?

   • 2 Na⁺ + SO₄²⁻ → Na₂SO₄
   • Cu²⁺ + OH⁻ → CuOH
   • Cu²⁺ + 2 OH⁻ → Cu(OH)₂
6. 6.

   Milo says AgCl dissolves because chlorides are soluble. Agree or disagree?

   • Disagree: Ag⁺ is an exception
   • Agree: the chloride rule has no exceptions
   • Agree: silver compounds dissolve
7. 7.

   Noah says Na₂CO₃ won't dissolve because carbonates are insoluble. Agree or disagree?

   • Disagree: group 1 carbonates dissolve
   • Agree: sodium compounds sink in water
   • Agree: the carbonate rule has no exceptions
8. 8.

   Pia says a solid forms whenever two salt solutions meet. Agree or disagree?

   • Agree: ions can't stay in solution
   • Disagree: a product must be insoluble
   • Agree: swapping partners makes a solid
9. 9.

   Which pair of solutions forms no precipitate when they meet, Tala?

   • CaCl₂ and K₂CO₃
   • KCl and NaNO₃
   • AgNO₃ and KCl
10. 10.

    A solution gives a white solid with silver nitrate. Which of its ions could cause the solid, Zee?

    • Nitrate
    • Chloride
    • Sodium