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Chemistry Class 11 > Ch 1 > Flashcards

Ch 1 Flashcards

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1
Q

What is the definition of a mole in chemistry?

A

A mole is a unit of measurement that represents 6.022 x 10^23 particles, such as atoms or molecules.

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2
Q

True or False: One mole of any substance contains the same number of entities.

A

True

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3
Q

Fill in the blank: The number of particles in one mole is known as ______.

A

Avogadro’s number

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4
Q

What is the molar mass of an element?

A

The molar mass of an element is the mass of one mole of that element in grams.

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5
Q

How do you calculate the number of moles from mass?

A

Number of moles = mass (g) / molar mass (g/mol)

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6
Q

What is the molar mass of carbon (C)?

A

The molar mass of carbon is approximately 12.01 g/mol.

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7
Q

Multiple Choice: What is the molar mass of water (H2O)? A) 18.02 g/mol B) 16.00 g/mol C) 20.00 g/mol

A

A) 18.02 g/mol

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8
Q

True or False: The mole can be used to convert between mass and number of particles.

A

True

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9
Q

What is the relationship between moles and molecules for a gas at standard temperature and pressure (STP)?

A

At STP, one mole of an ideal gas occupies 22.4 liters.

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10
Q

Fill in the blank: The formula to find the number of molecules is ______.

A

Number of moles x Avogadro’s number

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11
Q

What is the significance of Avogadro’s number in the mole concept?

A

Avogadro’s number allows chemists to count particles by weighing a sample.

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12
Q

Multiple Choice: How many moles are in 44 grams of CO2? A) 1 B) 2 C) 0.5

A

A) 1

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13
Q

What is the formula for calculating the mass of a substance from moles?

A

Mass (g) = number of moles x molar mass (g/mol)

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14
Q

True or False: The mole is a fundamental concept in stoichiometry.

A

True

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15
Q

What does it mean if a chemical equation is balanced in terms of moles?

A

It means that the number of moles of reactants equals the number of moles of products.

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16
Q

What unit is used to express molar mass?

A

Grams per mole (g/mol)

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17
Q

Fill in the blank: The mole concept helps in understanding ______ in chemical reactions.

A

Quantities

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18
Q

Multiple Choice: What is the molar mass of sodium chloride (NaCl)? A) 58.44 g/mol B) 40.00 g/mol C) 22.99 g/mol

A

A) 58.44 g/mol

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19
Q

What is the term for the mass of one mole of a substance?

A

Molar mass

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20
Q

True or False: A mole of neon gas weighs more than a mole of hydrogen gas.

A

True

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21
Q

What is the molar volume of a gas at STP?

A

22.4 liters

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22
Q

Fill in the blank: The mole concept is essential for calculating ______ in reactions.

A

Yields

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23
Q

Multiple Choice: Which of the following is not a unit of amount of substance? A) Mole B) Liter C) Mass

A

C) Mass

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24
Q

How many moles are in 100 grams of glucose (C6H12O6) if its molar mass is 180 g/mol?

A

0.56 moles

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25
Q

What is an empirical formula?

A

An empirical formula is a chemical formula that shows the simplest whole-number ratio of elements in a compound.

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26
Q

True or False: The empirical formula can be the same as the molecular formula.

A

True, if the compound is already in its simplest form.

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27
Q

Fill in the blank: The empirical formula of glucose (C6H12O6) is ____.

A

CH2O

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28
Q

Which of the following is an example of an empirical formula? A) C2H4 B) C6H12O6 C) CH4 D) H2O

A

D) H2O

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29
Q

What information is required to calculate an empirical formula?

A

The relative masses or percentages of each element in the compound.

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30
Q

True or False: The empirical formula provides information about the actual number of atoms in a molecule.

A

False, it only provides the ratio of atoms.

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31
Q

What is the empirical formula for benzene (C6H6)?

A

CH

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32
Q

How do you derive an empirical formula from percent composition?

A

Convert the percentages to grams, then to moles, and simplify the mole ratio to the smallest whole numbers.

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33
Q

True or False: The empirical formula can provide insight into the molecular structure of a compound.

A

False, it does not provide structural information.

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34
Q

What is the empirical formula of sodium sulfate (Na2SO4)?

A

NaSO4

35
Q

Multiple choice: Which of the following compounds has an empirical formula of C2H5? A) C4H10 B) C2H4 C) C6H12 D) C2H6

A

A) C4H10

36
Q

Fill in the blank: The empirical formula of a compound with a molecular formula of C10H20 is ____.

A

C5H10

37
Q

What is the empirical formula of ammonium nitrate (NH4NO3)?

A

N2H4O3

38
Q

True or False: Empirical formulas can be determined experimentally through combustion analysis.

A

True

39
Q

What is the empirical formula of calcium chloride (CaCl2)?

A

CaCl2

40
Q

Multiple choice: Which empirical formula corresponds to the molecular formula C8H16? A) C4H8 B) C2H4 C) C8H16 D) C1H2

A

A) C4H8

41
Q

What is the empirical formula for acetic acid (C2H4O2)?

A

CH2O

42
Q

Fill in the blank: The empirical formula for a compound containing 40% carbon and 60% oxygen is ____.

A

CO2

43
Q

True or False: The empirical formula is always a whole number.

A

True

44
Q

What is the empirical formula for magnesium oxide (MgO)?

A

MgO

45
Q

Fill in the blank: The empirical formula of a compound with the molecular formula C3H6 is ____.

A

CH2

46
Q

Multiple choice: What is the empirical formula for the molecular formula C5H10O5? A) C5H10O5 B) C2H4O2 C) C1H2O1 D) C1H2O2

A

B) C2H4O2

47
Q

What is the empirical formula of iron(III) oxide (Fe2O3)?

A

FeO

48
Q

True or False: Empirical formulas can represent ionic compounds.

A

True

49
Q

What is the empirical formula for a compound consisting of 2 moles of carbon and 6 moles of hydrogen?

A

C1H3

50
Q

Fill in the blank: The empirical formula of a substance with a molecular formula of C12H22O11 is ____.

A

C12H22O11

51
Q

Multiple choice: The empirical formula for C4H10 is: A) C2H5 B) C4H10 C) CH D) C1H2

A

C) CH

52
Q

What can be inferred if the empirical formula and molecular formula are identical?

A

The compound is already in its simplest form.

53
Q

True or False: The empirical formula can be used to determine the molecular weight of a compound.

A

False

54
Q

What method can be used to find the empirical formula from combustion data?

A

By measuring the amount of CO2 and H2O produced.

55
Q

Fill in the blank: The empirical formula of a compound that contains 30% sulfur and 70% oxygen is ____.

A

SO2

56
Q

Multiple choice: What is the empirical formula for the compound C6H12? A) C2H4 B) CH2 C) C3H6 D) All of the above

A

D) All of the above

57
Q

What is the term for the actual number of atoms of each element in a molecule?

A

Molecular formula

58
Q

True or False: The empirical formula is always a fraction of the molecular formula.

A

True

59
Q

What is the empirical formula for silver nitrate (AgNO3)?

A

AgNO3

60
Q

Fill in the blank: The empirical formula of a compound with a molecular formula of C10H20Cl2 is ____.

A

C5H10Cl

61
Q

Multiple choice: Which of the following is not an empirical formula? A) C2H4 B) H2O C) NaCl D) C3H6O3

A

D) C3H6O3

62
Q

What is the empirical formula for potassium phosphate (K3PO4)?

A

K3PO4

63
Q

True or False: Empirical formulas can help in stoichiometric calculations.

A

True

64
Q

What is the empirical formula of a compound that is 50% carbon, 6.7% hydrogen, and 43.3% oxygen?

A

C3H6O

65
Q

Fill in the blank: The empirical formula of a compound with a molecular formula of C2H4O2 is ____.

A

CH2O

66
Q

Multiple choice: Which of the following represents an empirical formula? A) C6H12 B) C4H10 C) C3H6 D) All of the above

A

D) All of the above

67
Q

What is the empirical formula for a compound with 2 moles of nitrogen and 6 moles of hydrogen?

A

N1H3

68
Q

True or False: Empirical formulas are unique to each compound.

A

False, multiple compounds can have the same empirical formula.

69
Q

What is the empirical formula of lead(II) oxide (PbO)?

A

PbO

70
Q

Fill in the blank: The empirical formula of a compound with 10% carbon, 20% hydrogen, and 70% oxygen is ____.

A

C1H2O3

71
Q

Multiple choice: What is the empirical formula for the molecular formula C8H16? A) C4H8 B) C2H4 C) C8H16 D) C1H2

A

A) C4H8

72
Q

What is the empirical formula of sulfur trioxide (SO3)?

A

SO3

73
Q

True or False: The empirical formula of a compound can be determined from its molecular formula directly.

A

False, it requires calculation.

74
Q

What do you call a compound with the empirical formula of CH2 and a molecular formula of C6H12?

A

Hexene

75
Q

Fill in the blank: The empirical formula of a compound containing 25% carbon, 50% hydrogen, and 25% oxygen is ____.

A

C2H4O

76
Q

Multiple choice: Which of the following compounds has the empirical formula C2H4? A) C2H4 B) C4H8 C) C6H12 D) All of the above

A

D) All of the above

77
Q

What is the empirical formula for a compound with a molecular formula of C5H10O2?

A

C5H10O2

78
Q

True or False: An empirical formula can be a molecular formula if it’s in its simplest form.

A

True

79
Q

What is the empirical formula of a compound with 60% carbon and 40% hydrogen?

A

C3H5

80
Q

Fill in the blank: The empirical formula of a compound with a molecular formula of C3H6 is ____.

A

CH2

81
Q

Multiple choice: The empirical formula of glucose is: A) C6H12O6 B) CH2O C) C3H6O3 D) C2H5OH

A

B) CH2O

82
Q

What is the empirical formula of aluminum sulfate (Al2(SO4)3)?

A

Al2S3O12

83
Q

True or False: Empirical formulas only apply to organic compounds.

A

False, they apply to all chemical compounds.

Chemistry Class 11 (1 decks)

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