Units Conversion Factors & Significant Numbers

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Units Conversion Factors & Significant Numbers – Chemistry

These Chemistry chapters discuss units conversion, conversion factors, scientific notations and significant numbers.


What type of compound has hydro as a prefix?

A Binary acid – correct

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

None are correct – 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

6.8cm x (10-2m/1cm) x (10-9m/1nm) = 

6.7cm 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

1.48×10CN

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

Midterm 1 Ch.2-4


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) = 

8.6cm 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. 

1.48×10CN

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


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?

Group of answer choices

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


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