Tek B.10

10B. (#1)

Precipitates are insoluble substances that result from reactions between aqueous solutions. Two solubility rules are shown.

Solubility Rules;

All nitrates are soluble. All halides are soluble except for Ag+, Pb+2 and Hg+22

Which compounds form a yellow precipitate in the reactdion:

Pb(NO₃ )₂ + KI --> PbI₂ + KNO₃ ?

• Pb(NO₃ )₂

• KI

• PbI₂

• KNO₃

Tags

NGSS.HS-PS1-2

10B. (#2)

Which mixture can be separated through filtration because one of the substances is insoluble in water?

• NaClO₃ and Pb(ClO₃)₂

• Na₂SO₄ and SrSO₄

• NaNO₃ and Pb(NO₃) ₂

• NaC₂H₃O₂ and Pb(C₂H₃O₂) ₂

10B. (#3)

Which substance is soluble in an aqueous solution?

• Pb(CO₃)₂

• Ag₃PO₄

• Sn(CrO₄)₂

• NH₄Cl

10B. (#4)

Which reactions produced precipitates?

1) Ba(NO₃)₂(aq) + Na₂CO₃(aq) --> BaCO₃(s) + 2BaNO₃(aq)

2) FeO₃(s) + CO(g) --> Fe(l) + CO₂(g)

3) Pb(NO₃)2(aq) + 2 NH₄I(aq) --> PbI₂(s) + 2 NH₄NO₃(aq)

4) CH₄ (g)+ O2(g) --> CO₂(g) + H₂O(l)

• 1,2

• 2,3

• 3,4

• 1,3

10B. (#5)

In a reaction between calcium hydroxide, Ca(OH)₂ and lithium sulfide, Li₂S, which of the following if any, would be the solid precipitate in water?

• calcium sulfide, CaS

• lithium hydroxide, LiOH

• calcium sulfide (CaS) and lithium hydroxide (NaOH)

• no precipitate produced

10E. (#1)

When the ends of two wires, from a circuit containing a battery and a lightbulb, are placed into a beaker containing an aqueous solution the light bulb glows brightly. From this observation, you can conclude the solution is probably —

• a concentrated but weak base

• a strong acid

• a pH neutral sample of a polar compound

• an acid added to a base

Tags

NGSS.HS-PS2-5

10E. (#2)

Which of the following describes a solution containing an electrolyte?

• The solute particles are so firmly bonded that they do not break apart.

• The solute particles permit the passage of an electric current.

• It is unstable, and all the solute will precipitate if the solution is disturbed.

• It cannot contain any more solute particles

10E. (#3)

Which of the following containers most likely containers sugar, C₁₂H₂₂O₁₁?

• Container A because it forms ions.

• Container B because it forms ions.

• Container A because it does not form ions.

• Container B because it does not form ions.

10E. (#5)

Which of the following is a strong electrolyte when dissolved in water?

• NaNO₃

• C₁₂H₂₂O₁₁

• C₂H₅OH

• CH₄

10E. (#6)

Classify Solution A and Solution B from the above image. (refer to your questionnaire)

• A is an electrolyte, B is a nonelectrolyte.

• A is a nonelectrolyte, B is an electrolyte.

• Both A and B are electrolytes.

• Both A and B are nonelectrolytes