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Chemistry Class 11 > Ch 1 > Flashcards

Ch 1 Flashcards

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
What is an empirical formula?
An empirical formula is a chemical formula that shows the simplest whole-number ratio of elements in a compound.
26
True or False: The empirical formula can be the same as the molecular formula.
True, if the compound is already in its simplest form.
27
Fill in the blank: The empirical formula of glucose (C6H12O6) is ____.
CH2O
28
Which of the following is an example of an empirical formula? A) C2H4 B) C6H12O6 C) CH4 D) H2O
D) H2O
29
What information is required to calculate an empirical formula?
The relative masses or percentages of each element in the compound.
30
True or False: The empirical formula provides information about the actual number of atoms in a molecule.
False, it only provides the ratio of atoms.
31
What is the empirical formula for benzene (C6H6)?
CH
32
How do you derive an empirical formula from percent composition?
Convert the percentages to grams, then to moles, and simplify the mole ratio to the smallest whole numbers.
33
True or False: The empirical formula can provide insight into the molecular structure of a compound.
False, it does not provide structural information.
34
What is the empirical formula of sodium sulfate (Na2SO4)?
NaSO4
35
Multiple choice: Which of the following compounds has an empirical formula of C2H5? A) C4H10 B) C2H4 C) C6H12 D) C2H6
A) C4H10
36
Fill in the blank: The empirical formula of a compound with a molecular formula of C10H20 is ____.
C5H10
37
What is the empirical formula of ammonium nitrate (NH4NO3)?
N2H4O3
38
True or False: Empirical formulas can be determined experimentally through combustion analysis.
True
39
What is the empirical formula of calcium chloride (CaCl2)?
CaCl2
40
Multiple choice: Which empirical formula corresponds to the molecular formula C8H16? A) C4H8 B) C2H4 C) C8H16 D) C1H2
A) C4H8
41
What is the empirical formula for acetic acid (C2H4O2)?
CH2O
42
Fill in the blank: The empirical formula for a compound containing 40% carbon and 60% oxygen is ____.
CO2
43
True or False: The empirical formula is always a whole number.
True
44
What is the empirical formula for magnesium oxide (MgO)?
MgO
45
Fill in the blank: The empirical formula of a compound with the molecular formula C3H6 is ____.
CH2
46
Multiple choice: What is the empirical formula for the molecular formula C5H10O5? A) C5H10O5 B) C2H4O2 C) C1H2O1 D) C1H2O2
B) C2H4O2
47
What is the empirical formula of iron(III) oxide (Fe2O3)?
FeO
48
True or False: Empirical formulas can represent ionic compounds.
True
49
What is the empirical formula for a compound consisting of 2 moles of carbon and 6 moles of hydrogen?
C1H3
50
Fill in the blank: The empirical formula of a substance with a molecular formula of C12H22O11 is ____.
C12H22O11
51
Multiple choice: The empirical formula for C4H10 is: A) C2H5 B) C4H10 C) CH D) C1H2
C) CH
52
What can be inferred if the empirical formula and molecular formula are identical?
The compound is already in its simplest form.
53
True or False: The empirical formula can be used to determine the molecular weight of a compound.
False
54
What method can be used to find the empirical formula from combustion data?
By measuring the amount of CO2 and H2O produced.
55
Fill in the blank: The empirical formula of a compound that contains 30% sulfur and 70% oxygen is ____.
SO2
56
Multiple choice: What is the empirical formula for the compound C6H12? A) C2H4 B) CH2 C) C3H6 D) All of the above
D) All of the above
57
What is the term for the actual number of atoms of each element in a molecule?
Molecular formula
58
True or False: The empirical formula is always a fraction of the molecular formula.
True
59
What is the empirical formula for silver nitrate (AgNO3)?
AgNO3
60
Fill in the blank: The empirical formula of a compound with a molecular formula of C10H20Cl2 is ____.
C5H10Cl
61
Multiple choice: Which of the following is not an empirical formula? A) C2H4 B) H2O C) NaCl D) C3H6O3
D) C3H6O3
62
What is the empirical formula for potassium phosphate (K3PO4)?
K3PO4
63
True or False: Empirical formulas can help in stoichiometric calculations.
True
64
What is the empirical formula of a compound that is 50% carbon, 6.7% hydrogen, and 43.3% oxygen?
C3H6O
65
Fill in the blank: The empirical formula of a compound with a molecular formula of C2H4O2 is ____.
CH2O
66
Multiple choice: Which of the following represents an empirical formula? A) C6H12 B) C4H10 C) C3H6 D) All of the above
D) All of the above
67
What is the empirical formula for a compound with 2 moles of nitrogen and 6 moles of hydrogen?
N1H3
68
True or False: Empirical formulas are unique to each compound.
False, multiple compounds can have the same empirical formula.
69
What is the empirical formula of lead(II) oxide (PbO)?
PbO
70
Fill in the blank: The empirical formula of a compound with 10% carbon, 20% hydrogen, and 70% oxygen is ____.
C1H2O3
71
Multiple choice: What is the empirical formula for the molecular formula C8H16? A) C4H8 B) C2H4 C) C8H16 D) C1H2
A) C4H8
72
What is the empirical formula of sulfur trioxide (SO3)?
SO3
73
True or False: The empirical formula of a compound can be determined from its molecular formula directly.
False, it requires calculation.
74
What do you call a compound with the empirical formula of CH2 and a molecular formula of C6H12?
Hexene
75
Fill in the blank: The empirical formula of a compound containing 25% carbon, 50% hydrogen, and 25% oxygen is ____.
C2H4O
76
Multiple choice: Which of the following compounds has the empirical formula C2H4? A) C2H4 B) C4H8 C) C6H12 D) All of the above
D) All of the above
77
What is the empirical formula for a compound with a molecular formula of C5H10O2?
C5H10O2
78
True or False: An empirical formula can be a molecular formula if it's in its simplest form.
True
79
What is the empirical formula of a compound with 60% carbon and 40% hydrogen?
C3H5
80
Fill in the blank: The empirical formula of a compound with a molecular formula of C3H6 is ____.
CH2
81
Multiple choice: The empirical formula of glucose is: A) C6H12O6 B) CH2O C) C3H6O3 D) C2H5OH
B) CH2O
82
What is the empirical formula of aluminum sulfate (Al2(SO4)3)?
Al2S3O12
83
True or False: Empirical formulas only apply to organic compounds.
False, they apply to all chemical compounds.

Chemistry Class 11 (1 decks)

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