Chemistry – Significant Figures & Conversion Factors
These chapters discuss Chemistry – Significant Figures & Conversion Factors
What type of compound has hydro as a prefix?
An Oxyacid
A Molecular Compound
An Ionic Compound
What type of compound is P2O5?
An Oxyacid
An Ionic Compound
A Binary Acid
A Molecular Compound – correct
How many Nitrates are present in the compound Al(NO3)3
3 – correct
1
4
2
What is the name of CuSO4?
Copper (I) Sulfate
Coper (II) Sulfite
Copper (II) Sulfate – correct
Cadmium (I) Sulfite
What is the name of MgF2
Magnesium (II) Fluoride
Difluoride Magnesium
Magnesium Fluoride – correct
Manganese Fluoride
How many significant figures are contained in the following number:
0.10300
2
5 – correct
None are correct
3
How many significant figures are contained in the following number:
5.032
1
Cannot be determined
4 – correct
3
Which is the correct way to write the following number in scientific notation?
90005.3427
9.00 x 104
None are correct
9.00053427 x 10-4
9.00053427 x 104 – correct
0.900053427 x 105
If someone is trying to convert 6.8 centimeters to nanometers what is the correct way to set this problem up?
6.8cm x (1cm/10-2m) x (1nm/10-9m) =
None are correct
6.8cm x (10-2m/1cm) x (1nm/10-9m) = – correct
6.6cm x (10-2m/1cm) x (10-9m/1nm) =
6.8cm x (1cm/10-2m) x (10-9m/1nm) =
How many surfboards can someone buy if surfboards cost 589 US Dollars and a person has 67981 Special Dollars? (hint: 1surfboard = 589 US Dollars)
1 US Dollar = 9.4 Special Dollars
None are correct
639021
12 – correct
115
1084
If a car gets 38miles/gallon. What is this value in kilometers/milliliter?
0.01573
15.73
16
0.016 – correct
On planet nalbandian there is a unit call nalos. 1 mile = 3.7 nalos. If you run 12.3 miles on earth how many nalos did you run?
3.3
45.5 – correct
3.32
46
On planet nalbandian there is a time unit called nans. 5.6 seconds = 1 nan. If it takes me 98 seconds to brush my teeth on earth how many nans did it take?
5488
17.5 – correct
18
5.6
What is the easiest way to set up conversion factors?
I have no idea
line up the same units on all numerators
the same units line up on all denominators
line up the same units on one numerator and one denominator so they cancel – correct
Matter is defined as:
Anything that occupies space and has mass. – correct
Anything that has mass.
Anything that occupies space.
Some things that occupy space and have mass.
None are correct.
Gasses and liquids are compressible
True
False – correct
Pure substances can be: Elements, Compounds and Heterogenous.
True
False – correct
A chemical change takes place when covalent bonds are broken and new covalent bonds are made.
True – correct
False
I want to make up my own energy units. I am going to call my energy unit CN after my initials. The conversion factor of CN is 1 CN = 156 cal.
How much CN do I have if I start with 954 joules? Hint: you need 2 conversion factors to solve this problem. The 2 are 4.184joules=1cal and 1CN=156cal.
228 CN
37.3 CN
1.48×105 CN
1.46 CN – correct
Specific heat capacity is a very useful measurement to identify substances. Remember the equation for specific heat capacity is q=mC(deltaT) delta T = Tf-Ti
What is the mass of a substance that has 67J of heat, a heat capacity of 0.385J/gC, a temperature final of 78C and a temperature initial of 4.0C?
2.35g
None are correct
2.3517g
2.4g – correct
2.351g
How many significant figures are contained in the following number:
0.10300
No answer text provided.
No answer text provided.
5 – correct
No answer text provided.
How many significant figures are contained in the following number:
5.032
4 – correct
3
1
Cannot be determined
Which is the correct way to write the following number in scientific notation?
90005.3427
0.900053427 x 105
9.00053427 x 10-4
9.00053427 x 104 – correct
None are correct
9.00 x 104
If someone is trying to convert 6.8 centimeters to nanometers what is the correct way to set this problem up?
6.8cm x (1cm/10-2m) x (10-9m/1nm) =
6.6cm x (1cm/10-2m) x (1nm/10-9m) =
6.8cm x (10-2m/1cm) x (10-9m/1nm) =
6.8cm x (10-2m/1cm) x (1nm/10-9m) = – correct
What is the correct way to set up the relationship between milligrams and grams?
10-3mg=1g
None are correct
1mg=10-3g – correct
10-6mg=1g
1mg=10-6g
How many surfboards can someone buy if surfboards cost 589 US Dollars and a person has 67981 Special Dollars?
1 US Dollar = 9.4 Special Dollars
115
639021
1084
12 – correct
None are correct
Matter is defined as:
Anything that has mass.
Anything that occupies space and has mass. – correct
None are correct.
Anything that occupies space.
Some things that occupy space and have mass.
Gasses and liquids are compressible
True
False – correct
Pure substances can be: Elements, Compounds and Heterogenous.
True
False – correct
A chemical change takes place when covalent bonds are broken and new covalent bonds are made.
True – correct
False
I want to make up my own energy units. I am going to call my energy unit CN after my initials. The conversion factor of CN is 1 CN = 156 cal.
How much CN do I have if I start with 954 joules? Hint: you need 2 conversion factors to solve this problem. The 2 are 4.184joules=1cal and 1CN=156cal.
1.48×105 CN
1.46 CN – correct
228 CN
37.3 CN
Specific heat capacity is a very useful measurement to identify substances. Remember the equation for specific heat capacity is q=mC(deltaT) delta T = Tf-Ti
What is the mass of a substance that has 67J of heat, a heat capacity of 0.385J/gC, a temperature final of 78C and a temperature initial of 4.0C?
2.351g
2.35g
2.3517g
None are correct
2.4g – correct
I created a new element called Nalbandianium. It has 3 isotopes. The first isotope has a mass of 56.78 amu with an abundance of 43.56% the second isotope has a mass of 58.89 amu with an abundance of 7.89% the third isotope has a mass of 60.55 amu with and abundance of 48.55%. What is the average mass of Nalbandianium?
56.77amu
58.78amu – correct
56.78amu
58.77amu
How many bitcoin can someone buy if one bitcoin costs 9345 US Dollars and a person has 6.78×106 Special Dollars?
1 US Dollar = 9.4 Special Dollars
6.82×103BTC
5.99×1011BTC
0.0682BTC
77.2BTC – correct
The special dollars were not a huge hit with a lot of people so the government started a new currency called big dollars. 1 US Dollar = 0.057 Big Dollars.
How many big dollars does it take to buy a 25.00 cent candy? (hint 100 cents = 1 US Dollar)
0.4386Big Dollars
142.5 Big Dollars
0.01425Big Dollars – correct
57.65Big Dollars
I drove and logged a total of 1297km and I filled up my gas tank 3 times, my gas tank can hold 25 liters. What is my mileage/gallon for this trip?
Use the conversion factors:
3.8Liter=1gallon
1.609km=1mile
27.6mi/gal
38mi/gal
282mi/gal
41mi/gal – correct
What is the specific heat capacity of an unknown substance if: The temperature increases from 67C to 98C and 7.2J of energy was absorbed. The mass of this unknown substance is 7.9g.
0.029J/gC – correct
0.094J/gC
0.91J/gC
0.23J/gC
If I put tree branches in a wood chipper and I turn the branch in to wood chips is this an example of a chemical change?
True
False – correct
If I bake some cookies for my significant other for valentines day, when the cookies are nice and golden is this a chemical or physical change?
Chemical – correct
Physical
I found 1.00×1011 pennies in an old abandoned mine. What is my financial value?
A trillionare
A billionare – correct
A dollarare
A thousandare
A millionare
If a car gets 38miles/gallon. What is this value in kilometers/milliliter?
0.01573
0.016 – correct
16
15.73
On planet nalbandian there is a unit call nalos. 1 mile = 3.7 nalos. If you run 12.3 miles on earth how many nalos did you run?
46
3.3
3.32
45.5 – correct
On planet nalbandian there is a time unit called nans. 5.6 seconds = 1 nan. If it takes me 98 seconds to brush my teeth on earth how many nans did it take?
18
5488
17.5 – correct
5.6
I created a new element called Nalbandianium. It has 3 isotopes. The first isotope has a mass of 56.78 amu with an abundance of 43.56% the second isotope has a mass of 58.89 amu with an abundance of 7.89% the third isotope has a mass of 60.55 amu with and abundance of 48.55%. What is the average mass of Nalbandianium?
58.77amu
56.77amu
58.78amu – correct
56.78amu
What charge does group 6A tend to form?
+1
-1
+2
-2 – correct
Classify the element Mg
metalloid
metal – correct
nonmetal
No answer text provided.
Classify the element Si
metalloid – correct
nonmetal
No answer text provided.
metal
Classify the element Ar
nonmetal – correct
No answer text provided.
metalloid
metal
Which subatomic particles have a negative charge?
neutrons
protons
electrons – correct
No answer text provided.
How many molecules of C4H10 are present in 5.6 grams of C4H10 ? Hint 2 conversion factors are needed. Avogadro’s number and molecular weight.
Atomic weights to use:
C = 12
H = 1
Group of answer choices
5.6 molecules C4H10
5.8×1022molecules C4H10 – correct
None are correct
2.6×1023molecules C4H10
What is the proportionality between CHCl3 and Cl respectively?
3CHCl3:3Cl
1CHCl3:1Cl
1CHCl3:3Cl – correct
3CHCl3:1Cl
What conversion factor would be used to solve the following problem:
Convert 8.99g of CO2 to moles of CO2
Group of answer choices
Avogadro’s number
Molecular weight – correct
Grams
Density
How many grams of chloride are present in 8.45 g of calcium chloride?
Atomic masses:
Ca = 40.08
Cl = 35.5
Group of answer choices
5.40g
8.45g
2.70g – correct
4.23g
How many kilograms are present in 6.78×1025molecules of Al2(SO4)3? (hint 1kg=103g)
Atomic masses:
Al = 27
S = 32
O = 16
Group of answer choices
0.891kg
Cannot be determined – correct
8.44kg
38.5kg