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- 1. Multiple Choice
Observe the diagram. Which of the following BEST describes this image?
The image correctly illustrates aqueous iron as water can dissolve anything.
The image incorrectly illustrates aqueous iron because uncharged iron ATOMS cannot dissolve in water.
- 2. Multiple Choice
Predict the products of the following process:
Fe+2(aq) + 2e- -----------------> ????
Note: 2e- are electrons from another atom
Fe+4 would form and iron ion would remain aqueous
Fe-2 would form and iron ion would remain aqueous
Fe with no charge would form and the iron would no longer be soluble in water; solid iron would form.
none of these are correct
- 3. Multiple Choice
In the reaction:
Fe(s) + CuCl2(aq)-----------> Cu(s) + FeCl2 (aq)
The iron loses 2 electrons and the Cu+2 gains 2 electrons
the iron goes from zero charge to +2 charge
The mole ratio in the balanced equation between all reactions and products is 1:1:1:1.
all of the choices are correct.
- 4. Multiple Choice
According to the reaction:
Fe(s) + CuCl2 (aq) ----------------> FeCl2(aq) + Cu(s)
Which sample(s) indicate excess Cu+2 in solution?
B only
C only
D only
Samples B-D all indicate excess Copper +2 ions
- 5. Multiple Choice
According to the balanced equation:
Fe(s) + CuCl2 (aq) ----------------> FeCl2(aq) + Cu(s)
If 0.025 moles of Iron were used, then ______ moles of copper metal should be produced.
0.025
0
0.050
it is impossible to predict this.
- 6. Multiple Choice
Which type of reaction best describes the Iron nail and copper chloride lab?
combustion
double replacement
synthesis
single replacement
- 7. Multiple Choice
Fe(s) + CuCl2 (aq) ----------------> FeCl2(aq) + Cu(s)
Predict what would occur if gold metal was placed in the copper chloride solution instead of Iron metal.
a reaction would occur and gold metal would lose electrons as copper gained electrons.
no reaction would occur as gold metal is less reactive than copper.
it is impossible to predict these types of chemical reactions.
- 8. Multiple Choice
Molarity, symbolized as M, measures the number of moles of solute dissolved in 1 Liter of water. According to the image, which two samples contain the same Molarity, that is, number of particles dissolved in the sample amount of water?
Solutions X and B
Solutions X and A
Solutions B and C
Solutions X and C
- 9. Multiple Choice
Which best describes Sample A at the end of the reaction?
Iron was the limiting react and Copper ion was in excess.
Iron and Copper were both in excess
Iron metal was in excess and Copper ion was the limiting reactant.
it is impossible to determine what occurred by the image.
- 10. Multiple Choice
All tubes began with a 0.75 Molar solution of blue Copper II Chloride. Which student's group would have been given the smallest mass of iron Nail to begin with?
Tube A because the solution is clear .
Tube B because there is a light blue meaning the most copper ion reacted with iron.
Tube D because the darkest blue color indicates very little copper ion reacted with iron.
- 11. Multiple Choice
Which best describes the role of the aqueous chloride ion?
it is directly involved in the reaction.
it is not involved in the reaction as is called a spectator ion.
- 12. Multiple Choice
Which best describes the Cl2 as it is written in the chemical formulas shown in the balanced chemical equation for the reaction:
Fes + CuCl2(aq) -------------------> FeCl2(aq) + Cus
The Cl2 in FeCl2(aq) should be considered the same Cl2 gas .
The Cl2 in FeCl2(aq) should be considered as two separate, aqueous Cl-1 ions.
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