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Which combination of the following items listed below are pure substances:
1. vegetable soup 2. wine 3. steam 4. carbon dioxide 5. orange

A.3,4

B.1,2

C.1,3,5

D.4 only

E.All are pure.

Question 2 of 20

2.0 Points

How many unpaired electrons do noble gases have?

A.0

B.None of the above

C.1

D.2

Question 3 of 20

3.0 Points

I wanted to make a hydrofluoric acid one day and started a chemical reaction. Can you balance the following equation for my reaction using the smallest set of whole numbers, then add together the coefficients? Don’t forget to count coefficients of one.

__ SF4 + __ H2O → __ H2SO3 + __ HF

In other words what would the sum of my coefficients equal?

A.7

B.9

C.6

D.4

Question 4 of 20

2.0 Points

An explanation for a set of observations that can be verified or tested later via experimentation is called what?

A.Theory

B.Hypothesis

C.None of the above

D.Law

In my lab through a complex series of reactions I was able to force potassium and nitrogen to combine as a binary compound. What is the formula for this?

A.K2N

B.NK2

C.NK3

D.KN

E.K3N

Question 6 of 20

2.0 Points

How would you express the radius of the earth, 3963.167 miles, with two significant digits?

A.3960

B.3900

C.3963.16

D.3963.00

If the following equation were correctly balanced what would the coefficient of H2O be (assuming the smallest set of whole numbers)?

___ Na + ___ H2O → ___ NaOH + ___ H2

A.3

B.2

C.4

D.5

E.1

Question 8 of 20

2.0 Points

What kind of reaction is represented by the equation below?

CH4(g) + 2 O2(g) —–> CO2(g) + 2 H2O(g)

A.acid-base neutralization

B.precipitation

C.there will be no reaction

D.oxidation-reduction

The mass of 1.21 × 1020 atoms of sulfur is

A.3.88 × 1021 g

B.2.00 mg

C.32.06 g

D.2.00 × 10-4 g

E.6.44 mg

Question 10 of 20

2.0 Points

I was digging around in the kitchen and came across the following items. Which one is most likely not an acid?

A.lemon

B.orange

C.None of these are acids

D.vinegar

E.baking powder

Question 11 of 20

2.0 Points

I want to separate a methanol, benzene, and toluene. What kind of separation do I need to perform?

A.fractional distiallation

B.simple distillation

C.physical separation

D.None of the above.

Question 12 of 20

3.0 Points

I had a 1.375 g sample of a very specific sugar that when completely burned in oxygen gives 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of this sugar is:

A.CHO

B.CH7O3

C.C3H7O3

D.CH2O

E.C3H2O

Question 13 of 20

2.0 Points

Which of the following pairs of elements would be most likely to form an ionic compound?

A.Cl and K

B.P and Br

C.Cu and K

D.Na and K

Question 14 of 20

2.0 Points

I was in the lab looking for the stock chemical Mn2O7, but it was only fully written on the bottle. Which is the correct name for this formula?

A.dimanganese heptaoxide.

B.magnesium oxide.

C.manganese(VII) oxide.

D.manganese(II) oxide.

E.manganese(III) oxide.

Question 15 of 20

2.0 Points

Obey the special safety precautions mentioned in each experiment.

True

False

Question 16 of 20

2.0 Points

Consider all chemicals to be hazardous unless instructed otherwise.

True

False

Question 17 of 20

3.0 Points

A metal figurine made of metal with a mass of 117 g is placed into a graduated cylinder that contains 27.00 mL of water, raising the water level to 58.00 mL. What is the density of the metal?

A.3.77 g cm-3

B.4.03 g cm-3

C.0.26 g cm-3

D.0.52 g cm-3

Question 18 of 20

2.0 Points

What is the largest mass listed below?

A.0.002 kg

B.4.0 x 102 mg

C.4.0 x 102 cg

D.2.0 x 105 ng

Question 19 of 20

2.0 Points

I wanted to make my own soap through a process of saponification and I needed a fat molecule in the soap. I isolated a fatty acid and knew that its composition, by mass, was 76.0% C, 12.8% H, and 11.2% O. The fatty acid’s molar mass was 284.5 g/mol. What is the molecular formula of the compound?

A.C9H18O

B.C16H28O4

C.C20H12O2

D.C18H36O2

E.C10H6O

Question 20 of 20

3.0 Points

One day in the lab I desperately needed hydrochloric acid, but could not find any. So I decided to try the following reaction: 2NaCl(s) + H2SO4(aq) → 2HCl(g) + Na2SO4(s) How many grams of HCl can be prepared from 2.00 mol H2SO4 and 200 g NaCl?

A.35 g

B.94 g

C.16 g

D.127 g

 
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