Chemistry Final Questions Portage
Version -1
1. Convert 1005.3 to exponential form and explain your
answer.: Convert 1005.3 = larger than 1 = positive exponent,
move decimal 3 places = 1.0053 x 10^3
2. Convert 4.87 x 10-6 to ordinary form and explain your
answer.:
Convert 4.87 x 10^-6 =negative exponent =smaller than 1, move
decimal 6 places = 0.00000487
3. 25.6 mg = ? grams: 25.6 mg x 1 g / 1000 mg = 0.0256
grams
4. 1.5 gal = ? qts: 1.5 gal x 4 qts / 1 gal = 6.0 qts
5. Do the three conversions shown below, showing all
work:
1. 328 K = ? °C
2. 76°C = ? °F
3. 135°F = ? °K
1. 328 K- 273= 55 C
2. 76 C X 1.8 = 136.8
136.8+32= 168.8 F
3. (135-32)/1.8=57.2
57.2+273= 330.2 K
6. Show the calculation of the mass of a 18.6 ml sample of
freon with density of 1.49 g/ml.: M = D x V = 1.49 x 18.6 =
27.7 g
, 7. Show the calculation of the density of crude oil if 26.3 g
occupies 30.5 ml.: 4c2. D = M / V = 26..5 = 0.862 g/ml
8. Complete the three problems below:
1. 13.010 contains ? significant figures.
2. 0.041 contains ? significant figures.
3. 13.010 - 0.041 = ? (give answer to correct number of
significant figures): -
13.010 contains 5 significant figures.
0.041 contains 2 significant figures.
13.010 - 0.041 = 12.969 = 12.969 (to the thousandth place for
13.010)
9. Classify each of the following 3 as an element,
compound, solution or heterogeneous mixture and explain
your answer.
1. Pepperoni Pizza
2. Potassium oxide
3. Phosphorus: 1. Heterogeneous Mixture; Pepperoni Pizza - is
not on periodic table (not element) - no element names (not
compound)appears as more than one substance (dough, cheese,
pepperoni) = Hetero Mix
2. Compound; Potassium oxide - is not on periodic table (not
element) - has two element names = Compound
3. Element; Phosphorus - is on periodic table = Element
10. Classify each of the following 3 as a chemical change
or a physical change.
1. Clumping of milk upon adding vinegar
Version -1
1. Convert 1005.3 to exponential form and explain your
answer.: Convert 1005.3 = larger than 1 = positive exponent,
move decimal 3 places = 1.0053 x 10^3
2. Convert 4.87 x 10-6 to ordinary form and explain your
answer.:
Convert 4.87 x 10^-6 =negative exponent =smaller than 1, move
decimal 6 places = 0.00000487
3. 25.6 mg = ? grams: 25.6 mg x 1 g / 1000 mg = 0.0256
grams
4. 1.5 gal = ? qts: 1.5 gal x 4 qts / 1 gal = 6.0 qts
5. Do the three conversions shown below, showing all
work:
1. 328 K = ? °C
2. 76°C = ? °F
3. 135°F = ? °K
1. 328 K- 273= 55 C
2. 76 C X 1.8 = 136.8
136.8+32= 168.8 F
3. (135-32)/1.8=57.2
57.2+273= 330.2 K
6. Show the calculation of the mass of a 18.6 ml sample of
freon with density of 1.49 g/ml.: M = D x V = 1.49 x 18.6 =
27.7 g
, 7. Show the calculation of the density of crude oil if 26.3 g
occupies 30.5 ml.: 4c2. D = M / V = 26..5 = 0.862 g/ml
8. Complete the three problems below:
1. 13.010 contains ? significant figures.
2. 0.041 contains ? significant figures.
3. 13.010 - 0.041 = ? (give answer to correct number of
significant figures): -
13.010 contains 5 significant figures.
0.041 contains 2 significant figures.
13.010 - 0.041 = 12.969 = 12.969 (to the thousandth place for
13.010)
9. Classify each of the following 3 as an element,
compound, solution or heterogeneous mixture and explain
your answer.
1. Pepperoni Pizza
2. Potassium oxide
3. Phosphorus: 1. Heterogeneous Mixture; Pepperoni Pizza - is
not on periodic table (not element) - no element names (not
compound)appears as more than one substance (dough, cheese,
pepperoni) = Hetero Mix
2. Compound; Potassium oxide - is not on periodic table (not
element) - has two element names = Compound
3. Element; Phosphorus - is on periodic table = Element
10. Classify each of the following 3 as a chemical change
or a physical change.
1. Clumping of milk upon adding vinegar
