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DAY 1
Answers below
A) 5 g of salt is dissolved in 20 g of water.
Solute ___salt___
Solution or salt + water
5/(5 +20)= 5/25 =.2 or 20 %
B) 20 g of salt is dissolved to form 40 g of solution.
Solute ___salt___
Solution or salt + water
20/(20 +20)= 20/40 =.5 or 50 %
C) How much water and salt are in 90 g of 10 % salt solution?
Salt= 90 g(.1)= 9g of salt.
Water= 90 g(.9) =81 g of water
Or Water= 90 g- 9 g=81 g of water
DAY 2
Answers below
A) 10 g of salt is dissolved in 20 g of water.
Solute ___salt___
Solution or salt + water
10/(10 +20)= 10/30 =.33 or 33 %
B) 3 g of salt is dissolved to form 30 g of solution.
Solute salt____
Solution or salt + water
3/(3 +27)= 3/30 =.1 or 10 %
C) What is the mass of water and salt in 50 g of a 30 % saline solution?
Salt mass(%)
50(.3)=15 g of salt
Total mass –salt mass= water mass
50 g-15 g= 35 g of water
DAY 3
Answers below
A) 20 g of salt is dissolved in 80 g of water.
Solute ___salt___
Solution or salt + water
20/(80 +20)= 20/100 =.2 or 20 %
B) 7 g of salt is dissolved to form 28 g of solution.
Solute ___salt___
Solution or salt + water
7/(7 +21)= 7/28 =.25 or 25 %
C) What is the mass of water and salt in 80 g of a 40 % saline solution?
Salt mass(%)
80(.4)=32 g of salt
Total mass –salt mass= water mass
80 g-32 g= 48 g of water
DAY 4
Answers below
A) 50 g of salt is dissolved in 100 g of water.
Solute ___salt___
Solution or salt + water
50/(50 +100)= 50/150 =.33 or 33 %
B) 25 g of salt is dissolved to form 125 g of solution.
Solute ___salt___
Solution or salt + water
25/(25 +100)= 25/125 =.2 or 20 %
C) What is the mass of water and salt in 120 g of a 20 % saline solution?
Salt mass(%)
120(.2) = 24 g of salt
Total mass – salt mass = water mass
120 g - 24 g = 96 g of water
DAY 1
Isotope
n
Charge
At. Mass
p
e-1
Iodide-125 ion
75
52
52
9
-1
9
Calcium-41
2
1
1
Isotope
n
Charge
At. Mass
p
e-1
Iodide-125 ion
72
-1
125
53
54
Tellurium-127
75
0
127
52
52
Fluoride-18 ion
9
-1
18
9
10
Calcium-41
21
0
41
20
20
Hydrogen-2
1
0
2
1
1
DAY 2
Isotope
n
Charge
At. Mass
p
e-1
Rhodium-
72
0
Phosphide-32 ion
18
10
10
41
19
18
46
-2
80
34
Isotope
n
Charge
At. Mass
p
e-1
Rhodium-117
72
0
117
45
45
Phosphide-32 ion
17
-3
32
15
18
Neon-18
8
0
18
10
10
Potassium-41 ion
22
+1
41
19
18
Selenide-80 ion
46
-2
80
34
36
DAY 3
Isotope
n
Charge
At. Mass
p
e-1
Zinc-62
32
0
62
30
30
Strontium-80 ion
42
+2
80
38
36
Nitride-15 ion
8
-3
15
7
10
Aluminum-28 ion
15
+ 3
28
13
10
Chloride-34 ion
17
-1
34
17
18
Isotope
n
Charge
At. Mass
p
e-1
Zinc-62
Strontium-80 ion
15
7
10
15
+ 3
13
-1
34
17
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