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CHEM LAB FINAL WITH MULTIPLE
CHOICE QUESTIONS AND ANSWERS
LATEST UPDATE 2023/2024

What happens to the monomer during the synthesis of a polymer?

A)
...
The monomer may be completely used to create the polymer

C
...
) Answer B and Answer C - ANSWER- D

What is the molecular weight of a polymer?
A
...
) 100 g / mol

C
...
) Polymers have no molecular weight - ANSWER- A

In the identification section of the procedures, if the pellet sank in water and
softened in acetone, what type of polymer do you have?

A
...
) Polyethylene terephthalate

C
...
) Polystyrene - ANSWER- D
A combs polymer has what kind of features?

A
...
) Branched, regular spacing

C
...
) Random, with no repeating functional units - ANSWER- B

Carbomethyl Cellulose (CMC) represents what type of polymer?

A
...
) Monomer

C
...
) Natural polymer - ANSWER- D
The most common topologies for polymers are

A
...
) Branched

C
...
) All of the above - ANSWER- D

Polymers are a chemical compound made of small molecules that are arranged in
simple repeating structures to form a large molecule
...
True or
False? - ANSWER- False

Which substance has the largest specific heat capacity value (c)?

A
...
) Aluminum

C
...
) Water - ANSWER- D

Adding heat to water results in a relatively small temperature change because

A
...
) Water is very dense which requires more heat

C
...
) All of the above - ANSWER- A

What factors does the transfer of heat depend on?

A
...
) Mass

C
...
) All of the above - ANSWER- D

What is the purpose of using a polystyrene cup?

A
...
) Because it is cheap and easy to hold

C
...
) To act as an insulated container that prevents heat loss - ANSWER- D

In the Heat Capacity experiment, when metal comes in contact with water in the
calorimeter what happens?

A
...
) Will decrease in temperature and receive heat from the water

C
...
) Will decrease in temperature and provide heat to the water - ANSWER- D

When a hot metal comes in contact with room temperature water the water's
temperature will change more drastically than the metal's temperature
...
True or False? - ANSWER- True

What is the balanced equation for the synthesis of malachite? - ANSWER2CuSO4 + H20 + 2Na2CO3 --> Cu2CO3(OH)2 + 2Na2SO4 + CO2 + 9H20

What is the excess reagent in the synthesis of malachite?
2CuSO4 + H20 + 2Na2CO3 --> Cu2CO3(OH)2 + 2Na2SO4 + CO2 + 9H20

A
...
) Sodium carbonate

C
...
) Both A and B - ANSWER- B

What is the limiting reagent in the synthesis of verdigris?
4CuSO4 + 5H2O + 6NH3 --> CuSO4 x 3Cu2(OH)2 + 3(NH4)2SO4
A
...
) CuSO4

C
...
) Not possible to predict - ANSWER- B

What is the mole to mole ratio of copper sulfate to malachite?
2CuSO4 + H20 + 2Na2CO3 --> Cu2CO3(OH)2 + 2Na2SO4 + CO2 + 9H20

A
...
) 2:1

C
...
) 6:12 - ANSWER- B

What should you do if ammonia gets in your eyes?
A
...
) Rinse your eyes and then put your contact lenses back in

C
...
) Rinse your eyes with water for at least 15 minutes and seek medical attention ANSWER- D

If CuSO4 5H2O is spilled on your hands what should you do?

A
...
) Carefully clean under your fingernails and the crevices of your knuckles

C
...
) All of the above - ANSWER- D

Is filter paper required for a Buschner funnel? Yes or No? - ANSWER- Yes

The evolution of carbon dioxide will not produce the bubbles in the synthesis of
malachite
...
- ANSWER- False

Should you poor chemicals down the sink? Yes or No - ANSWER- No

Is Katie a bad bitch? Yes or No - ANSWER- No

Gravity filtration requires a water aspirator
...
True or False - ANSWER- True

What determines the percentage of natural cranberry juice in cranberry apple juice?

A
...
) Atomic Absorbance Instrument

C
...
) None of the above - ANSWER- A

How does the UV-Spectrophotometer work?

A
...
) Measure the intensity of transmitted

C
...
) All of the above - ANSWER- D

The absorbance of cranberry juice is measured in

A
...
) Ultra violet region

C
...
) None of the above - ANSWER- A

What is unit of wavelength used in this experiment

A
...
) Nanometer

C
...
) None of the above - ANSWER- B

In the cranberry experiment, what were the units of the x and y axis?

A
...
) X is absorbance, Y is concentration

C
...
) X is wavelength, Y is concentration - ANSWER- A

The absorption spectra of apple juice reveals that

A
...
) Apple is responsible to the deep red color of cranberry-apple juice

C
...
) Not possible to predict - ANSWER- A

What is true about the calibration curve for this experiment

A
...
) Percent cranberry is determined using the equation y=mx+b

C
...
) None of the above - ANSWER- C

In this experiment, the apparatus needed is

A
...
) Pipet

C
...
) All of the above - ANSWER- D

How many mL of cranberry juice is required to prepare a 100mL 4% cranberry
solution using a 20% cranberry stock solution

A
...
0 mL

B
...
0 mL

C
...
0 mL

D
...
0 mL - ANSWER- C

The phytochemical anthocyanin give cranberries deep red color
...
True or False
- ANSWER- False

The percentage of toxin in the sand sample is determined using

A
...
) Atomic Absorption Instrument

C
...
) None of the above - ANSWER- C

Which is/are the terms associated with Mass spectrometry

A
...
) Fragment ions

C
...
) All of the above - ANSWER- D

Which is/are the terms associated with Chromatography
A
...
) Stationary phase

C
...
) Both A and B - ANSWER- D

Which of the following is an inert gas?

A
...
) Hydrogen

C
...
) All of above - ANSWER- A

What are the compounds present in the standard for experiment 10?

A
...
) Ethyl Benzene

C
...
) Both A and B - ANSWER- D

What was hexane transferred from in experiment 10?

A
...
) Buret

C
...
) Volumetric flask - ANSWER- A

The sample is kept in the spectrophotometer in

A
...
) GC vial

C
...
) Cuvet - ANSWER- D

Which of the following is a carcinogen?
A
...
) Deionized water

C
...
) None of the above - ANSWER- A

Which of the following statements are true?

A
...
) Hexane can be transferred outside the hood

C
...
) None of the above - ANSWER- A

Hexane is pipeted into the vial inside the hood
...
True or False? - ANSWERTrue

The standards for this experiment contains only hexane
...
True or False? - ANSWER- True

The amount of iron present in the cereal sample is determined using

A
...
) Atomic Absorption Instrument

C
...
) None of the above - ANSWER- B

The Atomic Absorption spectroscopy

A
...
) Separates a mixture of compounds

C
...
) None of the above - ANSWER- A

With increase in the concentration of Fe, Absorbance

A
...
) Decreases

C
...
) A or C - ANSWER- A

What is the unit of concentration used in experiment 11?

A
...
) ppm

C
...
) Molar - ANSWER- B

In experiment 11, the apparatus needed are

A
...
) Beaker

C
...
) All of the above - ANSWER- D

What is the amount of iron present in 30g of cereal when the recommended serving
size is 30g? The DRI of iron is 18mg/day
...
) 23
...
) 30
...
) 18
...
) 20
...
True or False? - ANSWER- True

The calibration curve is made by plotting the concentration vs absorbance for a
number of samples with known concentrations
...
When, during the reaction of magnesium, should you place the cover on the
crucible?
a
...
)Before turning on the burner
c
...
)When the metal begins to spark - ANSWER- When the metal begins to spark

10 How can you tell when the magnesium metal has reacted completely? (Review
Procedure A)
a
...

Avogadro's number
mole
molar mass

density - ANSWER- mole

14 What is the mass of one mole of magnesium metal?
12 g
24
...
31 g
40
...
31 g

15 How many moles are in 45
...
543 g
mass crucible, cover, and magnesium = 28
...
867 g
-- Refer to Example Exercise 1
0
...
324 g
0
...
449 g
0
...
125 g

17 What is the mass of sulfur that reacted with copper given the following data?
mass of a crucible and cover = 30
...
995 g
mass of crucible, cover, and copper sulfide = 32
...
678 g
2
...
659 g
0
...
332 g - ANSWER- 0
...
Determine the empirical formula of magnesium oxide from the following
data:
mass of crucible and cover + magnesium metal 33
...
500 g
mass of crucible and cover + magnesium oxide 33
...
500 g
mass crucible, cover, and iron = 28
...
218 g
Fe2O3

FeO
FeO2
Fe3O2
Fe2O - ANSWER- FeO

20 Which of the following is a source of serious experimental error in determining
the empirical formula of magnesium oxide?
lifting the crucible cover to check the progress of reaction
heating the crucible for more than 5 minutes
cooling the crucible for more than 10 minutes
allowing magnesium oxide to smoke excessively - ANSWER- allowing
magnesium oxide to smoke excessively
21 Which of the following safety precautions is advisable?
check the crucible for hairline cracks
all of the above
wear eye protection throughout the experiment
avoid breathing sulfur dioxide gas
avoid touching the hot crucible - ANSWER- all of the above

Using the given formula of aluminum oxide, Al2O3, refer to the periodic table and
predict the empirical formula for the oxide, B?O?
B2O3
B3O3
B2O3
B3O2 - ANSWER- B2O3

Using the given formula of aluminum oxide, Al2O3, refer to the periodic table and
predict the empirical formula for the oxides, Ga?O?
Ga2O3
Ga2O3
GA2O3 - ANSWER- Ga2O3

Using the given formula of aluminum oxide, Al₂O₃, refer to the periodic table and
predict the empirical formula for the oxides, Ga?O?
Ga₂O₃
Ga²O³
GA₂O₃
Ga₃O³ - ANSWER- Ga₂O₃

Using the given formula of aluminum oxide, Al2O3, refer to the periodic table and
predict the empirical formula for the oxides, In?O?
InO
In²O₃
In₂O₃
In²O³ - ANSWER- In₂O₃

Using the given formula of aluminum oxide, Al₂O₃, refer to the periodic table and
predict the empirical formula for the oxides, Tl?O?
TlO
Tl₃O₂
Tl₂O³
Tl₂O₃ - ANSWER- Tl₂O₃

Using the given formula of magnesium chloride, MgCl₂, refer to the periodic table
and predict the empirical formula for the following halide: magnesium fluoride
...


CCl2
CaCl₂
CCl
Ca₂Cl - ANSWER- CaCl₂

Using the given formula of magnesium chloride, MgCl2, refer to the periodic table
and predict the empirical formula for the following halide: strontium bromide
...

BI₂
BI

Ba₂I
BaI₂ - ANSWER- BaI₂

A 1
...
077 g of product
...
Do not use exponential notation or subscripts in your answers
...

c)Using their ratio of number of moles, this yields an empirical formula of ANSWER- a 0
...
00483
c
...
500-g sample of tin foil reacted with oxygen to give 0
...

Calculate the empirical formula of the tin oxide, reporting your answers to 3
significant figures
...

a) The mass of oxygen used in the reaction is_______ g
...

c) Using their ratio of number of moles, this yields an empirical formula of_____ ANSWER- 0
...
00421
0
...
000-g sample of cobalt metal reacted with sulfur powder to give 1
...
Reporting your answers to 3 significant figures
...

a) The mass of sulfur used in the reaction is_____ g
...
548
0
...
0171
CoS
A 0
...
963 g of
product
...
500 g x 1 mol/ 52 g = 0
...
963 g - 0
...
463 g
moles S = 0
...
0145 moles S
ratio of S/Cr = 0
...
0096 = 1
...
If the molar mass is 470 g/mol and
the percent composition is 85
...
0% Cl
...
Base: 100 g
=> Hg = 85
...
59 g/mol = 0
...
0 g / 35
...
4231 mol

Hg = 0
...
4231 = 1
...
4231 / 0
...
00

HgCl: 200
...
45 g/mol = 236
...
04 = 1
...
These water molecules can typically be
removed through heating

Name the following compounds:

a) FeCl3
...
5 H2O _________________________________________ ANSWER- A Iron(III) Chloride Hexahydrate
B Copper(II) sulfate

Write the formulas for the following compounds:

a) barium chloride dihydrate _________________________________

b) magnesium sulfate heptahydrate ___________________________ - ANSWERBaCl2
...
172% H2O = 48
...
48828) = 61
...

MnSO4
...
31 g/molS: 32
...
00 g/mol7
H2O: 126
...
52 g/mol
7 x 18
...
14 g/mol
mass of 7 H2O = 126
...
52 g/mol x 100 = 51
...
- ANSWER- Reactant

A substance resulting from a chemical reaction
...
- ANSWER- catalyst

A relative order of metals arranged in a list according to their ability to undergo a
chemical reaction
...
- ANSWER- Aqueous Solution

An insoluble solid substance produced from a reaction in aqueous solution
...
- ANSWERsupernatant

AB --> A + B - ANSWER- decomp

A + B --> AB - ANSWER- synthesis

AD (acid) + BC (base) --> AC (salt) + BD (water) - ANSWER- neutralization
AC + B --> BC + A - ANSWER- Single replacement

AC + BD --> AD + BC - ANSWER- Double replacement

List the 4 observations that provide evidence for a chemical reaction
...
change of temperature
2
...
an emission of gas
4
...

Phenolphthalein is______
in an acidic solution and [ Select ] in a basic solution
...
1 from
the data table: - ANSWER- 2 MgO (s)

Provide the chemical formula for the strong odor produced in reaction A
...
1 from
the data table: - ANSWERProvide the chemical formula for the flame-extinguishing gas produced in reaction
B
...
1 from the
data table: - ANSWER-

Provide the chemical formula for the colorless gas produced in reaction C
...
3 from the data table: - ANSWER-

Provide the chemical formula for the cream-colored precipitate (ppt) produced in
reaction D
...
2 from the data table: - ANSWER-

Provide the chemical formula for the white precipitate (ppt) produced in reaction
D
...
4 from the data table: - ANSWER-

Provide the chemical formula for the blue-white precipitate (ppt) produced in
reaction D
...
6 from the data table: - ANSWER-

Provide the chemical formula for the acid reacting in reaction E
...
2 from the data
table: - ANSWER-

Provide the chemical formula for the acid reacting in reaction E
...
1, E
...
3
from the data table:
(Hint: the answer is the same for all 3 reactions-look for what is common to all of
them) - ANSWEROpen the Activity Series of Metals page in a different browser tab, so you can have
the chart to answer these questions
...

Zn(s) + Cr(NO3)3(aq) = Reaction or No Reaction? - ANSWER- Reaction

Open the Activity Series of Metals page in a different browser tab, so you can have
the chart to answer these questions
...

Zn(s) + Fe(NO3)2(aq) = Reaction or No Reaction? - ANSWER- Reaction

Open the Activity Series of Metals page in a different browser tab, so you can have
the chart to answer these questions
...

Zn(s) + HNO3(aq) = Reaction or No Reaction? - ANSWER- Reaction

Refer to the solubility flowcharts from the textbook for this question:
NH4Cl: Soluble or insoluble in H2O? - ANSWER- Soluble

Refer to the solubility flowcharts from the textbook for this question:
Fe(C2H3O2)2: Soluble or insoluble in H2O? - ANSWER- Soluble

Refer to the solubility flowcharts from the textbook for this question:
Mg(NO3)2: Soluble or insoluble in H2O? - ANSWER- Soluble

Refer to the solubility flowcharts from the textbook for this question:
AgI: Soluble or insoluble in H2O? - ANSWER- Insoluble

Refer to the solubility flowcharts from the textbook for this question:
BaSO4: Soluble or insoluble in H2O? - ANSWER- Insoluble

Refer to the solubility flowcharts from the textbook for this question:
CaCO3: Soluble or insoluble in H2O? - ANSWER- Insoluble

Refer to the solubility flowcharts from the textbook for this question:
CuBr2: Soluble or insoluble in H2O? - ANSWER- Soluble

Refer to the solubility flowcharts from the textbook for this question:
AlPO4: Soluble or insoluble in H2O? - ANSWER- Insoluble

Refer to the solubility flowcharts from the textbook for this question:
ZnS: Soluble or insoluble in H2O? - ANSWER- Insoluble

_____K(s) + [ Select ] ["2", "1", "4", "3"] Cl2(g) --> 2 KCl(s) - ANSWER- 2
1
2

Select the coefficients needed to balance the chemical equation shown below
...

[ Select ] ["3", "1", "4", "2"] Pb(NO3)2(aq) + [ Select ] ["3", "4", "1", "2"] LiCl(aq)
--> [ Select ] ["3", "4", "2", "1"] PbCl2(s) + [ Select ] ["3", "1", "2", "4"]
LiNO3(aq) - ANSWER- 1
2
1
2
Select the coefficients needed to balance the chemical equation shown below
...
If the barometer reading is 754 mm Hg, what is the
partial pressure of the hydrogen gas? (Refer to Table 1)
...
0795 gram sample of magnesium metal reacts with hydrochloric acid to
produce 88
...
From Table 1, the
vapor pressure of water at 25 oC is______mm Referring to Example Exercise 1,
the newly adjusted pressure is therefore,______mm Using the Combined gas Law,
we can calculate the corrected (new) volume, which is__________mL In Liters,
this value is___________L
...
The molar volume of
hydrogen is therefore,________L/mol
...
0
742
79
...
0792
3
...
2
A 0
...
3 mL of hydrogen gas at STP
...
Referring to the
Periodic Table, the name of the unknown metal is________and symbol ANSWER-
...
85
Iron
Fe

Applying Boyle's Law Concept
...
- ANSWER- increases

Applying Charles's Law Concept
...
- ANSWER- decreases

Applying Gay-Lussac's Law Concept
...
- ANSWER- increases

A barometer reads 775 mm Hg
...
- ANSWER- 1
...
5
30
...
200-g sample of cobalt metal reacted with hydrochloric acid according to the
following balanced chemical equation:Co (s) + 2 HCl (aq) ➝ CoCl2 (aq) + H2 (g)
The volume of hydrogen gas collected over water was 87
...
Referring to Example Exercise 1, the adjusted
volume of the H2 gas is_________
mL and the number of moles of H2 gas is_________mol
...
- ANSWER- 79
...
00339
23
...
130-g sample of an unknown metal (X) reacted with hydrochloric acid
according to the following chemical equation:
2 X (s) + 6 HCl (aq) ➝ 2 XCl3 (aq) + 3 H2 (g)

The volume of hydrogen gas collected over water was 92
...
Referring to Example Exercise 2, the calculated atomic mass of the
unknown metal is as_________g/mol, identifying the symbol of the metal from the
periodic table as - ANSWER- 52
...
00 mL - ANSWER- the pink color of the phenolphthalein
indicator persists longer

What is the term for the procedure of delivering a measured volume of solution
through a buret?
QA or QC
standardization
titration
conditioning - ANSWER- titration

Which of the following is a source of serious experimental error?
bubbles are not cleared from the tip of the buret
the sodium hydroxide is not mixed thoroughly in the flask
the buret is not conditioned
all of these can cause serious experimental error - ANSWER- all of these can cause
serious experimental error

Which of the following is a source of serious experimental error?
the buret is not conditioned
the Erlenmeyer flasks are not dried before pipetting the vinegar samples
two drops (not one drop) of phenolphthalein indicator are used - ANSWER- the
buret is not conditioned

In addition to wearing safety goggles, which of the following safety precautions is
advisable?
handle the buret carefully to avoid breakage
avoid overfilling the buret
all of these safety precautions are advisable
avoid contact with NaOH - ANSWER- all of these safety precautions are advisable

During a titration, what solution usually goes into the buret?
indicator
water
base
acid - ANSWER- base

At the end point of a titration, the phenolphthalein indicator will cause the solution
to turn:
red
yellow
purple
pink - ANSWER- pink

A 0
...
3 mL of hydrogen gas at STP
...
Referring to
the Periodic Table, the name of the unknown metal is - ANSWER-

A 0
...
5 mL of hydrogen gas at 25 oC and 766 mm Hg
...
Referring to Example Exercise
1, the newly adjusted pressure is therefore,___________mm
...
In
Liters, this value is_________ L
...
The molar volume of
hydrogen is therefore,____________L/mol
...
0
742
79
...
0792

3
...
2



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