Week 4 Lesson Quiz

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Question #1

When you balance the Separate Water simulation how many H2 molecules do you need to complete the balanced equation?

A 1

B 2

C 4

D 3

Question #2

When you balance the Combust Methane simulation how many CO2 molecules do you need to complete the balanced equation?

A 3

B 2

C 1

D 4

Question #3

When you balance the Make Ammonia simulation how many H2 molecules do you need to complete the balanced equation?

A 1

B 3

C 4

D 2

Question #4

When you balance the Combust Methane simulation how many CH4 molecules do you need to complete the balanced equation?

A 1

B 3

C 2

D 4

Question #5

When you balance the Separate Water simulation how many individual oxygen atoms do you need on the products side to complete the balanced equation?,,

A 2

B 3

C 1

D 4

Question #6

What is the statistical rule of thumb to determine adequate sample size?

A A statistical power level of 80 percent

B A statistical power level of 10 percent

C A statistical power level of 60 percent

D A statistical power level of 50 percent

E A statistical power level of 90 percent

Question #7

Which of the following is NOT a reason why Wakefield’s study on the connection between autism and vaccinations was flawed?

A the study demonstrated everyone’s well being was taken care of

B the study had a small sample size

C the study acquired samples unethically and, quite possibly, illegally

D the study was not replicable

E the authors committed deliberate fraud to support their hypothesis

Question #8

Which type of variable does not change during an experiment, and serves as a comparison point for all data points?

A random

B control

C dependent

D independent

Question #9

‘We discussed how some solutions are electrolytes in this lesson. Which of these would be a strong one?

A HCl

B NH4Cl

C NaC2H3O2

D NaCl

E all of the above

Question #10

How is the best way to describe an aqueous solution?

A an ionic compound containing water dissolved in it.

B water that contains a dissolved compound

C any liquid that contains a dissolved compound

D all of these are accurate

Question #11

Which of the following compounds is soluble?

A copper carbonate

B strontium carbonate

C calcium carbonate

D sodium carbonate

Question #12

If I mixed hydrochloric acid with ammonium sulfate, what type of reaction would occur?

A no reaction

B gas evolution

C precipitation

D oxidation-reduction

E acid-base neutralization

Question #13

We all know that if we drop a little aluminum foil (Al) into a bottle with some The Works toilet cleaner (HCl) and cap the lid, it can result in an explosion as a result of the buildup of hydrogen gas. Which of the following represents the COMPLETE ionic equation for this reaction?

A H+(aq) + Cl-(aq) + 2Al(s) → 2Al3+(aq) + Cl-(aq) + H2(g)

B H+(aq) + Cl-(aq) + Al(s) → Al3+(aq) + Cl-(aq) + H2(g)

C 6H+(aq) + 6Cl-(aq) + 2Al(s) → 2Al3+(aq) + 6Cl-(aq) + 3H2(g)

D 6HCl(aq) + 2Al(s) → 2AlCl3(aq) + 3H2(g)

E none of the above

Question #14

If you are balancing the reaction __Ca3N2 + __H2O → __Ca(OH)2 + __NH3 , what number would go in front of NH3?

A 12

B 6

C 2

D 3

E none of the above

Question #15

When the reaction below is balanced, what number belongs in front of KOH? ___ H3PO4 + ___ KOH –> _____ K3PO4 + ____ H2O

A 3

B 1

C 2

D 6

Question #16

According to the solubility rules, which of these compounds will dissolve (i.e. is soluble)?,,

A aluminum carbonate

B aluminum hydroxide

C aluminum sulfate

D aluminum sulfide

E none of the above

Question #17

We have learned how to write molecular equations, complete ionic equations, and net ionic equations. What statement is FALSE regarding these three equations?

A A spectator ion remains unchanged in the reaction and appears on both sides of the equation.

B All of the statements are true.

C A net ionic equation is an equation showing only the species that actually change during the reaction.

D A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution.

E A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction

Question #18

If you had one test tube containing aqueous AgNO3 and another one containing NH4Cl, and you poured them together into a beaker, what would be the formula of the precipitate that forms?

A AgCl

B NH4NO3

C H2O

D AgNH4

E none of these will form

Question #19

Batrachotoxin (C31H42N2O6) is the most potent non-peptide (we’ll learn what that means in Lesson 7) based poison known. It gained fame though its use in poison darts made from frog excretions. The frogs themselves don’t produce the toxin directly, but through digestion of Melyrid beetles the frogs eat. Suppose you are trekking through the rainforest and discover an even more potent toxin that has the same empirical formula as batrachotoxin. If the molar mass of this new poison is 3,232.02 g/mol, what is its molecular formula?

A C31H42N2O6

B C1240H1680N80O240

C C186H252N12O36

D C15.5H21NO3

Question #20

The empirical formula of an insecticide is found to be CHCl, and its molar mass is 290.8 g/mol. How many atoms of carbon are found in a molecule of the insecticide?

A 8

B 2

C 6

D 3

E 4

Question #21

Nicotine (C10H14N2), a member of the nightshade family of plants, is an oily liquid that makes up between 0.6 to 3% of a cigarette’s mass. Contact with the liquid pure form can cause death within hours, as nicotine passes through the dermis and heads directly for the bloodstream. Overdoses and death can easily occur in those smoking cigarettes with nicotine patches applied on their body. How many nicotine molecules are in 1.00 g of nicotine?,,

A 9.76 x 1025

B 1.02 x 10-26

C 3.71 x 1021

D 2.32 x 1022

Question #22

`I was wading in the creek and discovered what I thought to be a small meteorite. I took it home and found its mass to be 12.00 kg. I ran some fancy schmancy chemical tests on it, and determined that the mass of nickel within the sample was 300.0 grams. What is the mass percent of nickel in the meteorite?

A 4.00%

B 25.00%

C 100.00%

D 2.50%

Question #23

One of the compounds listed below represents an empirical formula. Which one?

A C5H12O2

B C22H34O10

C C6H6

D C6H12O3

Question #24

`Nicotine (C10H14N2), a plant alkaloid, is an oily liquid that makes up between 0.6 to 3% of a cigarettes mass. Contact with the liquid pure form can cause death within hours, as nicotine passes through the dermis and heads directly for the bloodstream. Overdoses and death can easily occur in those smoking cigarettes with nicotine patches applied on their body. How many nicotine molecules are in 4.50 g of nicotine?

A 2.32 x 1022

B 9.76 x 1025

C 1.02 x 10-26

D 1.67 x 1022

Question #25

`I have some aliens in my basement who have developed a chemical weapon in an attempt to escape. I was able to survive the first attack and capture a sample of the dangerous gas. I analyzed it to find that it had a molar mass of 648.52 grams, and its empirical formula is C5H11N2O2P. What is its molecular formula?

A cannot be determined from the information given

B C20H44N8O8P4

C C5H11N2O2P

D CH2.2N0.4O0.4P0.2

E C10H22N4O4P2

Question #26

I was in the lab analyzing compounds from a drug bust and found a compound that had an empirical formula C17H14O7 with a mass of 1321.31 g/mol. What is the value of n (the multiplier) necessary to find the molecular formula?

A 3

B 4

C 2

D 1

E 7

Question #27

Tabun (C5H11N2O2P) is one of the first nerve agents discovered, and this liquid is known for a fruity odor and can be sprayed as a mist that causes convulsions and paralysis. Tabun itself is not extremely deadly, but the success of this chemical compound in war led to the development of deadlier toxins like soman (C7H16FO2P) and sarin (C4H10FO2P). Iraqi soldiers used Tabun in the final days of the Iran/Iraq war to kill thousands of Iranians. Which of these compounds contains the highest percentage of phosphorus by mass?

A soman

B sarin

C All of these compounds have the same percentage of phosphorous.

D tabun

Question #28

The golden dart frog is considered the most poisonous vertebrate in the world, with pufferfish close behind in second place. Pufferfish produce a compound known as tetrodotoxin (C11H17N3O8) that is a neurotoxin. In Japan, pufferfish are considered a delicacy and to be licenced to prepare it for others, a chef must prepare it for himself and not die. Paralysis can start in as little as 20 minutes and death in 4-6 hours. You are collecting tropical fish from a little known cove in the pacific and studying your catch. You believe that you have discovered an even more potent neurotoxin that has the same empirical formula as tetrodotoxin, but has a mass of 1277.28. What is the molecular formula for the new poison?

A C22H34N6O16

B C133H51N9O24

C C44H68N12O32

D C1240H1680N80O240

Question #29

A compound responsible for the odor of garlic has a molecular weight of 146 g/mol. A 0.650 g sample of the compound contains 0.321 g of carbon, 0.044 g of hydrogen, and 0.285 g of sulfur. What is the molecular formula of the compound?,,

A C6H10S2

B C3H15S3

C CH5S

D C3H5S

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