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Gen. Chem. I > Lab Final > Flashcards

Lab Final Flashcards

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1
Q

Mathematical model for water cooling from experiment 1

A

Exponential decay

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2
Q

Nominal volume

A

The volume given by the measuring device. May differ from the true volume appreciably.

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3
Q

Mean deviation formula

A

(Σ|x - x̄ |)/n

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4
Q

Can pentane solutions be poured down the sink?

A

No!

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5
Q

How do you clean the glassware in experiment three, in which pentane and oleic acid was used?

A

Rinse the glassware with acetone or pentane, NEVER water!

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6
Q

Flow of light through a spectrophotometer

A

Light source –> lens –> sample cell –> slit –> diffraction grating –> diode array detector

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7
Q

Beer’s Law

A

Relates absorbance to concentration

A = (molar absorptivity)(path length)(concentration)

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8
Q

What temperature is a bunsen burner in its dark blue inner cone?

A

Extremely hot

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9
Q

What temperature is a bunsen burner in its pale blue violet outer region?

A

Moderately hot

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10
Q

What temperature is a bunsen burner if its flame is luminous and yellow?

A

Cool

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11
Q

Concentration (c) calculation

A

= (absorbtivity)(cm or unit of length) / (absorbance) = ab/A

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12
Q

Percent yield formula

A

(Experimental mass / theoretical mass) times 100

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13
Q

In the redox reaction involving hydrogen peroxide and permanganate, what is being oxidized?

A

Oxygen / hydrogen peroxide

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14
Q

In the redox reaction involving hydrogen peroxide and permanganate, what is being reduced?

A

Manganese / permanganate

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15
Q

In the redox reaction involving hydrogen peroxide and permanganate, what is the oxidizing agent?

A

The permanganate ions

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16
Q

In the redox reaction involving hydrogen peroxide and permanganate, what is the reducing agent?

A

The hydrogen peroxide

17
Q

What was the purpose of the NaOH in the first part of the neutralization experiment?

A

The solution of unknown concentration being titrated

18
Q

What was the purpose of the KHP (potassium hydrogen phthalate) in the first part of the neutralization experiment?

A

The standard solution of known concentration used as the titrant or reagent for the NaOH solution of unknown concentration

19
Q

What was the purpose of the NaOH in the second part of the neutralization experiment?

A

The standard solution of known concentration used as the titrant or reagent for the vinegar solution of unknown concentration

20
Q

What was the purpose of the vinegar in the second part of the neutralization experiment?

A

The solution of unknown concentration being titrated

21
Q

What was the purpose of the phosphoric acid in the third part of the neutralization experiment?

A

The solution of concentration being titrated to determine how many times the acid has reacted with the titrant

22
Q

What was the purpose of the NaOH in the third part of the neutralization experiment?

A

The standard solution of known concentration used as the titrant or reagent for the phosphoric acid solution of unknown concentration

23
Q

Hess’s Law is dependent on…

A

The first law of thermodynamics, which states that energy cannot be created nor destroyed.

It also depends on enthalpy being a state function

24
Q

How to standardize the molarity of a titrant?

A

Moles of analyte present / original volume of the analyte

25
Q

True volume

A

The volume etched on the side of the volumetric glassware

26
Q

What kind of powder was used to enhance the visibility of the oil layer in that one useless experiment?

A

Lycopodium powder

27
Q

Does water density change with temperature?

A

Yes

28
Q

Which test should be used to determine if an outlying value can be omitted from a data set?

A

Q Test

29
Q

What transition metal was contained within the compound analyzed via absorption
spectroscopy this semester in experiment 4?

A

Chromium

30
Q

Do all crystalline materials have the exact atom ratios predicted by their molecular formulae?

A

Nope

31
Q

What is the endpoint of permanganate redox titration?

A

A pale pink color

32
Q

Which law states that “If two elements combine to form more than one compound, then the
amounts of element A that combine with a fixed amount of element B will be in a ratio of
small whole numbers?

A

The Law of Multiple Proportions

33
Q

According to Boyle’s law, as volume (V) decreases, pressure (P) increases. A graph of 1/P
on the x-axis and V on the y-axis should…

A

Be Linear and not regress to zero

34
Q

The molar volume of what two gases were determined in the molar volume of a gas
experiment?

A

Hydrogen and Oxygen

35
Q

A gas that has a pressure of 1.0 atm and volume of 45 mL at 25°C is heated to 78°C. If the
pressure remains constant, does the volume increase or decrease?

A

Increase

Gen. Chem. I (10 decks)

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