1.
A balanced equation will show:
The total masses of all reactants and products.
The same number and type of atoms on each side.
The total volume of all reactants and products.
A step by step pathway of how reactants are converted into products.
0.5 points
QUESTION 2
1.
Determine the number of oxygen atoms in the following compound:
Cr(PO4)3
1
3
4
12
0.5 points
QUESTION 3
1.
Balance the following equation by supplying the correct coefficients before each substance. Use a number 1 if no
coefficient needs to be placed. For example, the balanced equation 2 H2 (g) + O2 (g) --> 2 H2O (l) should read 2
H2 (g) + 1 O2 (g) --> 2 H2O (l).
C4H10 (l) +
O2 (g) -->
CO2 (g) +
H2O (g)
0.5 points
QUESTION 4
1.
Balance the following equation by supplying the correct coefficients before each substance. Use a
number 1 if no coefficient needs to be placed. For example, the balanced equation 2 H2 (g) + O2 (g) -->
2 H2O (l) should read 2 H2 (g) + 1 O2 (g) --> 2 H2O (l).
Al (s) +
O2 (g) -->
Al2O3 (s)
0.5 points
QUESTION 5
1.
Consider a 10 M HCl solution. If we wanted to make this solution more dilute, we could:
Add more water to the solution.
Remove some water from the solution.
Add more HCl to the solution.
Spill some of the solution.
0.5 points
QUESTION 6
1.
Determine whether the following properties/definitions are characteristic of acids, bases, or salts.
Taste bitter
A. salts
B. bases
Ionic compounds
composed of cations C. acids
other than hydrogen
and anions other
than hydroxide
Can be acidic, basic,
or neutral.
Generally form
solutions with a pH
greater than 7
Can be defined as a
substance that
donates hydrogen
ions during a
reaction
turns litmus red
0.5 points
QUESTION 7
1.
Classify the following acids and bases as weak or strong.
A. weak
HCl
B. strong
KOH
HNO3
Ba(OH)2
NH3
HCN
0.5 points
QUESTION 8
1.
Identify the conjugate base in the following reaction:
HC2H3O2 + H2O --> C2H3O2- + H3O+
HC2H3O2
H2O
C2H3O2H3O+
0.5 points
QUESTION 9
1.
Which of the following is not a major contributor to acid rain?
CO2
SO2
NO
NaOH
0.5 points
QUESTION 10
1.
The leading chemical substance produced in the United States is
sulfuric acid
hydrochloric acid
sodium hydroxide
calcium carbonate
The following virtual lab will explore acids, bases, and pH. Click on the link below to
access the virtual lab:
https://phet.colorado.edu/sims/html/ph-scale-basics/latest/ph-scale-basics_en.html
Once inside:
1. Click on the red button on the dropper (for chicken soup) and fill the beaker to 0.5 L.
2. Next, drag the green pH probe to the beaker, and record the pH of the solution.
3. Determine whether this solution is acidic, basic, or neutral.
4. Now, click on the blue button (to the right), and add enough water to fill the beaker to
0.75 L. What happens to the pH when water is added?
5. Click on the orange button (right bottom) to reset the experiment.
6. Repeat steps 1-5 for the remaining solutions.
7. Copy and paste the following data and questions when you submit your lab report (by
clicking on the write submission tab).
Data
1. Chicken soup
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
2. Drain cleaner
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
3. Hand soap
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
4. Blood
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
5. Spit
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
6. Milk
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
7. Coffee
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
8. Orange juice
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
9. Soda pop
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
10. Vomit
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
11. Battery acid
pH of solution =
acidic, basic, or neutral?
What happens to the pH upon the addition of water?
Lab questions
1.) Briefly describe the relationship between pH and the acidity/basicity of a solution.
2.) What happens to the pH when water is added to an acidic solution? To a basic
solution?
3.) Were you surprised by any of the results? If yes, please explain.
4.) Besides from using a pH meter, what are other ways to determine the pH of a
solution?
Notes:
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