What mass (in grams) of KCl will dissolve in 100g of H2O at 60° C?
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45g KCl/100g H20
100
15 g KCl in 100 g water (express as %)
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Part/Whole
15/115 (100) = 13 %
100
What is the element that has an atomic number of 47?
Silver
100
What is the name of: NaBr
Sodium Bromide
100
Positively charged particles in an atom are the
Protons
200
DOUBLE JEOPARDY!!!!!!!!!!!!
You dissolve 45 g of KNO3 in 100g of water at 50oC, making an unsaturated solution. How many additional grams of KNO3 must be
added to produce a saturated solution at 50oC?
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82 - 45 = 37g KNO3
200
15g KCl in 150g water. (express as %)
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15/165 (100) = 9.1%
200
# of protons and # of electrons are the same as the _______________.
Atomic number
200
Potassium Chloride: Write the cation, anion, and formula on the white board. (include charges)
Cation: K+1
Anion: Cl-1
Formula: KCl
200
The “glue” that holds different kinds of atoms together is the attraction between:
opposite charges or protons (+) and electrons (-)
300
A supersaturated solution of potassium nitrate is formed by adding 95 g KNO3 to 100 g water, heating until the solute completely dissolves, and then cooling the solution to 50oC. If the solution is agitated, how much potassium nitrate will precipitate?
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95 - 82 = 13g KNO3
300
DOUBLE JEOPARDY!!!!!!!
75 g lithium ions dissolved in 300 g water (express as pph)
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75/375 (100) = 20 pph
(100) = pph
300
Name these elements and spell them correctly on the white board.
1. Ag
2. B
3. P
1. Silver
2. Boron
3. Phosphorous
300
Aluminum Nitrite: Write the cation, anion, and formula on the white board. (include charges)
Cation: Al+3
Anion: NO2-1
Formula: Al(NO2)3
300
Ionic substances that include the hydroxide ion in their structure are called
bases
400
What is the minimum mass (in grams) of 50°C water needed to dissolve 90 g of KNO3?
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82/100 = 90/X (Cross multiple, solve for X)
X = 109.8g H2O
400
0.024 g sucrose dissolved in 150 g water (express as ppm)
# of electrons: 79
Using this information above find the following (write answers on white board):
1. Element Name
2. Element Symbol
3. Atomic Number
4. Mass Number
5. # of protons
6. # of neutrons
1. Gold
2. 79
3. 79
4. 196.97
5. 79
6. 117.97
400
DOUBLE JEOPARDY!!!!!!!!!!!!!!
Iron (III) Sulfate: Write the cation, anion, and formula on the white board. (Include charges)
Cation: Fe+3
Anion: SO4-2
Formula: Fe2(SO4)3
400
As temperature increases
a) the solubility of a gas decreases
b) the solubility of a gas increases
c) the solubility of a solid decreases
d) the solubility of a solid increases
e) both b and d are true
ab) both a and d are true
ab
page 1C in notebook
500
How much 50oC water would have to be added (to the original 100 g water) to just dissolve all of the KNO3?
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82/100 = 95/X (Cross multiple,solve for X) - Use 95g KNO3 from ? # 5!!
X = 115.9 - 100 (original) = 15.9g H2O
500
1. 35g sugar dissolved in 250g water (ppt)
2. Do the little tea pot song (the whole group)
35/285 (1,000) = 122.8 ppt
ppt = 1,000
500
1. Name 3 Halogen elements
2. What group are the least reactive elements?
5 Al2(SO4)3 name: aluminum sulfate: 1. Total number of oxygen atoms; 2. Total number of sulfur atoms; 3. The number of molecules
1. 60
2. 15
3. 5
500
Write your answers on the white board:
1. Name the following 5 symbols:
a. gold b. sodium c. lead d. potassium e. silver
2. Name the following 5 polyatomic ions:
a. NO2- b. SO42- c. OH- d. NO3- e. HCO3-
1a) Au b) Na c)Pb d)K e)Ag
2a) Nitrite b)Sulfate c)Hydroxide d)Nitrate e)Hydrogen carbonate