Vocab
In maple syrup, the ratio of solute to solvent is very large. What term is used to describe this?:
A. Dilute
B. Concentrated
C. Saturated
D. Supersaturated
Concentrated (B)
Classify the following as either a strong electrolyte, weak electrolyte, or non-electrolyte:
1. Cs(OH)2
2. C2H5
1. Strong Base = Strong Electrolyte
2. Non-Electrolyte
Classify the following statements as true (T) or false (F). If they are False, correct the statement to be true.
1. Strong acids and strong bases are weak electrolytes.
2. Strong acids and strong bases dissociate into ions when dissolved in solutions.
1. F = Strong acids and strong bases are strong electrolytes.
2. T
Predict if the following compound would be soluble or insoluble in water:
1. K2CO3
2. AgNO3
3. CaSO4
1. Soluble (CO3 is usually insoluble, but group 1 is an exception)
2. Soluble
3. Insoluble
What type of reaction is a precipitation reaction and why?:
A. Single Replacement
B. Double Replacement
C. Combustion
D. Synthesis
Double Replacement
- Cations and Anions in two compounds "switch partners."
AB + CD => AD + CB
You have a solution that has been heated up to dissolve more solute than it can normally dissolve, and then cooled back down to room temperature. What type of solution do you have?
A. Unsaturated
B. Supersaturated
C. Saturated
D. Diluted
Supersaturated (B)
Define an electrolyte.
A substance that
1. dissolves in water to yield a solution that conducts electricity
2. undergoes dissociation and breaks apart into its constituent ions
Classify the following compounds as strong acids, strong bases, or neither.
1. KOH
2. Rb(OH)2
3. Mg(OH)2
4. KCl
1. strong base
2. strong base
3. neither (weak base)
4. neither (ionic compound)
Which of the following will be insoluble in water?:
I. AgBr
II. Mg(OH)2
III. LiOH
IV. AgSO4
I , II, IV
Consider the precipitation Rxn:
AgNO3 + CaCl2 -> __ + __
Please complete the rxn and balance it.
2AgNO3 + CaCl2 -> 2AgCl + Ca(NO3)2
You dissolve table salt (NaCl) into water. What is your solute and what is your solvent?
solute = NaCl
solvent = water
Classify the following as strong electrolyte, weak electrolyte, non-electrolyte:
1. H3PO4
2. Sucrose (C12H22O11)
3. KOH
1. Weak acid = weak electrolyte
2. non-electrolyte
3. strong base = strong electrolyte
Select all of the following that are true:
1. All electrolytes are strong acids or strong bases.
2. Bases dissociate less than acids do in solution.
3. MgOH is a strong base.
none of these.
Come up with two examples of soluble compounds based on the solubility rules.
Answers will vary, follow the solubility chart on slideshow.
Write the NET ionic equation for the following equation:
2AgNO3 + CaCl2 -> 2AgCl + Ca(NO3)2
Ionic = 2Ag+(aq)+2NO3-(aq) + Ca2+(aq)+2Cl-(aq) -> 2AgCl(s) + Ca2+(aq) + 2NO3-(aq)
Net Ionic = 2Ag+(aq)+ 2Cl-(aq) -> 2AgCl(s)
When a solution is cooled, a solid mass is formed at the bottom of the solution. What term is used to describe this solid mass?:
A. Solute
B. Precipitate
C. Electrolyte
D. Solvate
Precipitate (B)
Name 2 of the classes of chemical compounds that are strong electrolytes.
Ex: Strong Acids
Strong Bases
Ionic Compounds
Strong Conductors of Electricity
1. HBr
2. H2SO4
3. MgOH
4. ClO3
1. Strong acid
2. Strong acid
3. neither
4. neither
Classify the following as either soluble or insoluble in water:
I. NH4Cl
II. CaSO4
III. MgS
IV. LiCO3
I. Soluble
II. Insoluble
III. Insoluble
IV. Soluble
In ionic equations, when do you write out ions?
A. Always
B. When they dissociate (strong electrolytes)
C. When they dissociate and are soluble
C!
What is the difference between molecular and ionic equations?
Molecular equations do not show ions when they dissociate. Ionic Equations do show ions.
Select all of the following that are true:
I. All strong acids are strong electrolytes
II. All electrolytes, when dissolved in solution, exhibit conduction of electricity
III. Ca(OH)2 is a weak electrolyte.
IV. Ionic solutions dissociate completely in solution.
V. All weak acids are strong electrolytes.
I, II, IV are true.
Name 3 of the strong acids and 5 of the strong bases from memory. (Hint: use periodic table for the bases and remember our mnemonic: So I Seemingly Brought No Clean Clothes)
See Slideshow.
Free Space: Please discuss as a group:
What is one thing you will do to study for the fourth Exam differently than you have studied for past Exams? What is one thing you will do the same?
Write the ionic and net ionic equation for the following equation, make sure to balance it first!
Al2(SO4)3(aq) + Ca(NO3)2(aq) -> Al(NO3)3(aq) + CaSO4(aq)
Ionic = 2Al3+(aq) + 3SO42-(aq) + 3Ca2+(aq) + 6NO3-(aq) -> 2Al3+(aq) + 6NO3-(aq) + 3CaSO4(s)
Net = 3SO42-(aq) + 3Ca2+(aq) -> 3CaSO4(s)