Name___________________
In Class Assignment
1) Draw a Bohr-Rutherford diagram for a Fluorine atom and a Carbon atom. Give the number of Protons,
Electrons, Neutrons and the overall charge of the nucleus and the overall charge of the entire atom.
F
C
IONS p. 42
2) Draw a Bohr-Rutherford diagram for a Fluorine atom that has gained one electron and an Carbon atom that
has gained 4 electrons. Give the number of Protons, Electrons, Neutrons and the overall charge of the nucleus
and the overall charge of the entire atom. Label the atom.
3) Draw a Lewis diagram for a Fluorine atom and a Carbon atom.
F
C
4) You get a job as a lifeguard. Congratulations!! You are working hard saving the life of overweight swimmers
and keeping the water clean. Your boss comes to you in the middle of your shift and says he had a difficult
night sleeping last night (the neighbor’s cat was too loud). He cannot remember the two parts that make up an
aqueous solution and the water supervision government is on the phone and will shut the pool down if he
cannot tell them the right answer. He has asked you for help. What are the two parts called?
5) Example. Follow along to understand. Concentration is equal to:
C (g/L) = Mass of solute(g) / Volume of solution(L)
For example 10 grams of salt are added to water and the total solution equals 2 Liters. What is the
concentration of the solution?
Concentration = 10 grams / 2 Liters = 5grams per Liter or 5 grams/Liter or 5 g/L
It means there are 5 grams of salt in every Liter of solution
For question 6,7,8,9, 10 show all your work!
6) A 4 gram sugar cube is added to a 1 Liter cup of coffee. What is the concentration of the dissolved sugar in
g/L?
7) An 8 gram sugar cube is added to a 50 mL cup of coffee? What is the concentration of the dissolved sugar in
g/L?
8) Two 5 gram sugar cubes are added to a 100 mL cup of coffee? What is the concentration of the dissolved
sugar in g/L?
9) How much salt is dissolved in 80 Liters of sea water? We know that the concentration of sea water is 35 g/L
10) 10 grams of salt must be mixed with how much soup so that the soup has a salt concentration of 1.2 g/L?
Fill in the blank
11) The concentration of a solution ______________________ with the addition of solute.
12) The concentration of a solution ______________________ with the addition of a solvent.
Concentration (ppm) p.53
1ppm is equal to 1 gram of solute divided by 1000000 grams of solution
13)
Convert 1 gram/ Liter into ppm. Show all your work.
14) Convert 0.5g/ L into ppm. Show all your work.
15) Convert 1ppm into gram/Liter
16) Convert 15 ppm into gram/Liter
17) If 20 Liters of tap water contains 0.04 grams of Fluoride ions, what is the concentration of the fluoride ions
in ppm?
18) If 20 Liters of tap water contains 4 milligrams (mg) of Iron ions, what is the concentration of the Iron ions in
ppm?
19) The nickel concentration of the lake is 0.1ppm. What is the nickel concentration in g/L?
20) The copper concentration in a town’s drinking water is 0.8ppm. It is recommended to ingest approximately
0.9mg of copper per day. How many liters of water contain 0.9mg of copper?
21) Is each of the following substances a molecule, an element or an ion? Check the appropriate
column.
Symbol
Molecule
Element
Ion
a) Na



b) Na2+



c) F2



d) CH4



e) Cl-



f) Cl


