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Chemistry > Chemistry The Final Final > Flashcards

Chemistry The Final Final Flashcards

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1
Q

Using the rules of significant figures, calculate the following
0.110cm x 120cm=

A

13cm^2

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2
Q

Using the rules of sig figs calculate the following
45.10 x 0.060 =

A

2.7

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3
Q

The number 0.03056 rounded to three sig figs is

A

0.0306

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4
Q

How many sig figs are in he number 2300.0

A

5

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5
Q

How many sig figs in the number
9.0 x 10^4

A

2

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6
Q

When making a measurement with a tool such as a ruler or a graduated cylinder, how many uncertain digits can be reported in the answer?

A

1

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7
Q

In the product of 1.04 mL x 0.310 g/mL, the number of sig figs is

A

3

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8
Q

How many sig figs are in the number 19.8030

A

6

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9
Q

How many sig igs are in the number 1.30 x 10^6

A

3

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10
Q

Which of the following has the least number of sig figs
a. 5000
b. 500
c. 50
d. all the same amount

A

d. all the same amount

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11
Q
  1. “Steel wool burns in the air, forming iron oxide.”
    identify the type of reaction
    a. single replacement
    b. combustion
    c. synthesis
    d. decomposition
    e. Two of the above
A

e. two of the above

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12
Q

general equation for decomposition reaction

A

AB -> A+B

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13
Q

All of teh following are clues that a chemical reaction has taken place except:
a. a color change
b. a soild forms
c. the reactant is smaller
d. temperature decreases
e. bubbles form

A

c. reactant is smaller

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14
Q

What type of chemical reaction is shown below
2 NO2 —> 2 NO + O2
a. combustion reaction
b. decomposition reaction
c. single replacement
d. synthesis reaction
e. Two of the above are correct

A

b. decomposition reaction

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15
Q

One _____ contains Avogadro’s number of molecules
a. mole
b. weight
c. gram
d. all of the choices

A

a. mole

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16
Q

Avogadro’s number of particles in a mole holds true for _______.
a. formula units
b. molecules
c. atoms
d. all of the choices

A

d. all of the choices

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17
Q

The representative particle for nitrogen dioxide is the ________.
a. atom
b. molecule
c. formula unit
d. gram

A

b. molecule

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18
Q

What is the molar mass of potassium sulfate? Show work
a. 135.16g/mol
b. 86 g/mol
c. 174.27 g/mol
d. 110.27 g/mol

A

c. 174.27 g/mol

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19
Q

The representative particle for copper (II) sulfide is the ________.
a. formula unit
b. atom
c. molecule
d. gram

A

a. formula unit

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20
Q

which represents the greatest number of moles?
a. 50.0 g Cu
b. 50.0 g Al
c. 50.0 g Fe
d. 50.0 g Li
e. They all contain the same number of atoms

A

d. 50.0 g Li

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21
Q

Which of the following contains the least amount of particles?
a. 6,000,000,000
b. 6.02 x 10^23
c. 2.0 moles
d. 3.01 x 10^23
e. .5 moles

A

a. 6,000,000,000

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22
Q

The number of particles in a mole is known as _________.
a. alchemist’s number
b. avogadro’s number
c. formula unit
d. Dalton’s number

A

b. avogadro’s number

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23
Q

The representative particle for zinc is the __________.
a. molecule
b. formula unit
c. gram
d. mole
e. atom

A

e. atom

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24
Q

In the balanced equation
2 H2 + O2 –> 2 H20
a. 2 moles of hydrogen reacts with 2 mole of oxygen
b. 4 moles of hydrogen reacts with 1 mole of oxygen
c. 2 moles of hydrogen reacts with 1 mole of oxygen
d. 4 moles of water are produced

A

c. 2 moles of hydrogen reacts with 1 mole of oxygen

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25
Q

True or false a reaction stops when all the limiting reactants are consumed.

A

true

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26
Q

Which of the following remains constant in Gay- Lussac’s Law?
a. pressure
b. temperature
c. volume
d. none

A

c. volume

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27
Q

What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the sample increased from 20 C to 40 C
a. no change
b. become half its value
c. it would increase
d. it would decrease
e. two of these

A

c. it would increase

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28
Q

Use the kinetic molecular theory of gases to predict what would happen to a closed sample of a gas whose temperature increased while its volume decreased.
a. its pressure would hold constant
b. the number of moles of the gas would decrease
c. it pressure would decrease
d. the average kinetic energy of the molecules of the gas would decrease
e. its pressure would increase

A

e. its pressure would increase

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29
Q

For a given amount gas at a constant temperature, the volume of gas varies inversely with its pressure is a statment of ________ law.
a. Avogadro’s
b. Curie’s
c. Charles’s
d. Boyle’s

A

d. Boyle’s

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30
Q

Which of the following is not a postulate of the kinetic-molecular theory?
a. molecules of a gas move rapidly and in straight lines
b. if two molecules collide with each other the total energy of the molecules before the collision is the same as their total energy after the collision
c. The molecules of a gas are strongly attracted to each other
d. the molecules in a gas are tiny compared to the distance between them

A

c. The molecules of a gas are strongly attracted to each other

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31
Q

Synthesis

A

A + B –> AB

32
Q

Decoposition

A

AB –> A + B

33
Q

Combustion

A

__ + O2 –> ____

34
Q

Single Replacement

A

A + BC –> AC + B

35
Q

Double Replacement

A

AB + CD –> AD + CB

36
Q

What is the most reactive Halogen

A

Chlorine

37
Q

What is the most reactive metal

A

Lithium

38
Q

What is the least reactive metal

A

gold

39
Q

Stoichiometry

A

using conversion factors to show the quantitative relationship between the reactants and products in a chemical reaction.

40
Q

What is needed to determine a chemical reaction?

A

a balanced equation

41
Q

percent yeild

A

compares the actual amount of product obtained to the theoretical yield as predicted from the calculation

42
Q

theoretical yeild

A

amount of product predicted from the amount of reactants used, the maximum amount of product that could be produced.

43
Q

percent yield equation

A

actual yield (a)/ theoretical yield (t) x 100

44
Q

Gay-Lussac’s law
As temperature decreases, pressure _______.

A

decreases, decreases

45
Q

Avogadro’s Law
As the amount of moles (n) of a gas increases volume _______.

A

increases

46
Q

Pressure, volume, temperature, or amount?
L

A

volume

47
Q

Pressure, volume, temperature, or amount?
K

A

temperature

48
Q

Pressure, volume, temperature, or amount?
grams

A

amount

49
Q

Pressure, volume, temperature, or amount?
atm

A

pressure

50
Q

Pressure, volume, temperature, or amount?
mL

A

Volume

51
Q

Pressure, volume, temperature, or amount?
kPa

A

Pressure

52
Q

Pressure, volume, temperature, or amount?
C

A

Temperature

53
Q

Pressure, volume, temperature, or amount?
mm Hg

A

pressure

54
Q

Pressure, volume, temperature, or amount?
moles

A

amount

55
Q

Pressure, volume, temperature, or amount?
psi

A

pressure

56
Q

Boyle’s Law
as pressure is increased volume is _____.

A

decreased

57
Q

Charles’s Law
as temperature decreases volume _______.

A

decreases

58
Q

Which gas law applies to the example?
A balloon shrinks after it is placed in a freezer

A

Charles’s

59
Q

Which gas law applies to the example?
An airplan passenger’s ears pop as the airplane takes off.

A

Boyle’s

60
Q

Which gas law applies to the example?
The balloons all have the same volume. This means they all contain the same number of molecules.

A

Avogadro’s

61
Q

Which gas law applies to the example?
An aerosol can explodes when left in a hot car.

A

Gay-Lussac’s

62
Q

Boyle’s Law Equation

A

P1V1 = P2V2

63
Q

Charles’s Law Equation

A

V1/T1 = V2/T2`

64
Q

Avogadro’s Law Equation

A

V1/n1 = V2/n2

65
Q

Gay-Lussac’s Law Equation

A

P1/T1 = P2/T2

66
Q

Ideal Gas Law Equation

A

PV = nRT

67
Q

What are the five main indicators that a chemical reaction has occured?

A

smell, production of gas, color change, temperature change, formation of a precipitate

68
Q

True or False
In a properly reported measurement, one or more insignificant digits are reported

A

False

69
Q

True or False
A reaction stops when all limiting reactants are consumed

A

True

70
Q

True or False
The reactant which is consumed completely in a reaction is called the excess reactant

A

False

71
Q

A jewelry designer has 10 rings and 17 diamonds. He has to use 2 diamonds per ring. What will be the theoretical yield of the rings?

A

8

72
Q

True or False
The actual yield is greater than the theoretical yield

A

False

73
Q

The ____ yield is the maximum amount obtained when all of the limiting reagents has reacted

A

theoretical yield

74
Q

What contributes to a percent yield that is greater than 100%
a. the percent yield greater than 100% is impossible
b. spills during the experimental process
c. allowing too much time for the reaction to occur
d. impurities in the product

A

d. impurities in the product

75
Q

If some of the product of a chemical reaction couldn’t be removed from the reaction vessel, its calculated percent yield would be _____ than its theoretical yield
a. higher
b. equal
c. lower

A

c. lower

76
Q

Boyle’s Law relates _______ and _____ if _______ and amount of gas are held constant.

A

pressure, volume, temperature

77
Q

Charles’s Law relates _____ and ______ if ______ and amount of gas are held constant

A

volume, temperature, pressure

Chemistry (8 decks)

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