Chemistry Lab Final Part 2

To carefully pour a liquid into another container.

The liquid that was carefully poured into a new container.

CH₃COOH and HC₂H₃O₂ are different ways of writing the chemical formula of the which chemical ?

• acetic acid

• acetate ion

• peracetic acid

• acetone

Which of the chemicals are oxidants?

• HCl

• HNO₃

• K₂CrO₄

• NH3

• SnCl₂

You have two test tubes.  One test tube contains Pb⁺² (aq) solution and the other test tube contains Bi⁺³(aq).

Predict what will happen when HCl (aq) is added to both test tubes.
If a reaction occurs, what is the new chemical fomula?

• Pb⁺² (aq) will remain unchanged.
  Bi⁺³ (aq) will form a white precipitate, Bi(OH)₃ (s).

• Pb⁺² (aq) will form a white precipitate, PbCl₂ (s).
  Bi⁺³ (aq) will remain unchanged.

• Pb⁺² (aq) will form a yellow precipitate,  PbCrO₄ (s).
  Bi⁺³ (aq) will remain unchanged.

• Pb⁺² (aq) will remain unchanged.
  Bi⁺³ (aq) will form a white precipitate, Bi (s).

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

You have one test tube which contains a colorless solution that is either Cu⁺² (aq) or Bi⁺³(aq).

Select a reagent that will allow you to differentiate between the two chemical species.
If the solution is Cu⁺², what will happen when the reagent is added?
If the solution is Bi⁺³, what will happen when the reagent is added?

Select one:

• 15 M NH₃
  If it is Cu⁺², a dark blue solution will form after adding the 15 M NH₃.
  If it is Bi⁺³, a white precipitate will form after adding the 15 M NH₃.

• HCl
  If it is Cu⁺², a white precipitate will form after adding the HCl.
  If it is Bi⁺³, the solution will remain the same after adding the HCl.

• NaOH + SnCl₂

  If it is Cu⁺², a black solid will form after adding the NaOH + SnCl₂.
  If it is Bi⁺³, a white solid will form after adding the NaOH + SnCl₂.

• HCl

  If it is Cu⁺², the solution will remain the same after adding the HCl.
  If it is Bi⁺³, a white precipitate will form after adding the HCl.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

You have two test tubes.  One test tube contains Pb⁺² (aq) solution and the other test tube contains Bi⁺³(aq).

Predit what will happen when HCl (aq) is added to both test tubes.
If a reaction occurs, what is the new chemical fomula?

• Pb⁺² (aq) will remain unchanged.
  Bi⁺³ (aq) will form a white precipitate, Bi(OH)₃ (s).

• Pb⁺² (aq) will form a white precipitate, PbCl₂ (s).
  Bi⁺³ (aq) will remain unchanged.

• Pb⁺² (aq) will form a yellow precipitate,  PbCrO₄ (s).
  Bi⁺³ (aq) will remain unchanged.

• 
  Pb⁺² (aq) will remain unchanged.
  Bi⁺³ (aq) will form a white precipitate, Bi (s).

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match the correct inference to the description of the reactions from the Group 1 & 2 Qualitative Analysis Experiment.

In step 1-D, after the 6 M NH₃ was added, the white precipitate dissolved creating a colorless solution.  Then, after the addition of 6 M HNO₃  (and the solution tested acidic), a white precipitate formed.

• Ag+ is confirmed as present

• Pb+2 is confirmed as present

• Ag+ and Pb+2 are indicated as possibly present

Match the correct inference to the description of the reactions from the Group 1 & 2 Qualitative Analysis Experiment.

In step 1-C, after adding the CH₃COOH and K₂CrO₄, the colorless solution turned yellow and no solid formed.

• Ag+ is confirmed as present

• Pb+2 is confirmed as present

• Ag+ and Pb+2 are indicated as possibly present

Match the correct inference to the description of the reactions from the Group 1 & 2 Qualitative Analysis Experiment.

In step 1-A after adding the 6 M HCl to an unknown, a white precipitate formed with a colorless decantate.

• Ag+ is confirmed as present

• Pb+2 is confirmed as present

• Ag+ and Pb+2 are indicated as possibly present