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General Chemistry - Chemistry I and Lab > Module 4 - Atoms V5 > Flashcards

Module 4 - Atoms V5 Flashcards

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1
Q

The law of constant composition states that all samples of a pure compound will always have the same elements in the same proportion.

A

true

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2
Q

An element consists of more than one type of atom.

A

false

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3
Q

Who discovered the atom?

A

Leucippus and Democritus

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4
Q

Which scientist is credited with discovering the electron?

A

Thomson

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5
Q

Electrons are positively charged.

A

false

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6
Q

Electrons are smaller than protons.

A

true

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7
Q

The mass number is always equal to the charge.

A

false

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8
Q

The atomic number of an atom is equal to…

A

the number of protons

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9
Q

The mass number is the number of electrons and protons in an atom.

A

false

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10
Q

Isotopes are not naturally present in nature.

A

false

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11
Q

The average atomic mass of an element does not account for naturally occurring isotopes.

A

false

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12
Q

What subatomic particle is not considered when calculating atomic mass?

A

electrons

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13
Q

The horizontal rows of the periodic table are called…

A

periods

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14
Q

The periodic table has 7 periods.

A

true

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15
Q

A nonmetal is a shiny, malleable element that is a good conductor of heat and electricity.

A

false

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16
Q

Who is often considered to be the father of atomic theory?

A

Dalton

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17
Q

Which is not a postulate of Dalton’s atomic theory?

A

An element consists of multiple types of atoms.

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18
Q

Thomson conducted the oil drop experiment, resulting in the calculation of electrical charge.

A

false

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19
Q

Based on the results of the gold foil experiment, Rutherford is known for his discovery of the…

A

proton

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20
Q

Millikan conducted the oil drop experiment, which resulted in the discovery of how the _____ of a(n) _____ is calculated.

A

mass; electron

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21
Q

_________ came up with the plum pudding model of the atom following his discovery of the electron.

A

Thomson

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22
Q

Which is not a subatomic particle?

A

isotope

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23
Q

The ______ is the center of an atom.

A

nucleus

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24
Q

The nucleus is negatively charged.

A

false

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25
Q

In the chemical symbol for hydrogen, what does the +1 refer to?

A

charge

26
Q

How are isotopes different from their original element?

A

Isotopes have a different number of neutrons.

27
Q

Which series is correct for fluorine-19?

A

9 protons, 9 electrons, 10 neutrons, atomic number 9, mass number 19

28
Q

What is the average atomic mass of beryllium?

A

9.0122amu

29
Q

What is the average atomic mass of nitrogen?

A

14.006amu

30
Q

Suppose that naturally occurring rubidium with an average atomic mass of 85.468 amu has 2 isotopes, Rubidium-85 and Rubidium-87 with atomic masses 84.911 amu and 86.909 amu, respectively. What is the percent abundance of Rubidium-85?

A

72%

31
Q

The periodic table is arranged in order by increasing…

A

atomic number

32
Q

Which is not displayed for each element in the periodic table?

A

isotope numbers

33
Q

The atomic number is equal to the number of electrons in an element.

A

false

34
Q

The rows in the periodic table are called…

A

periods

35
Q

Which is not considered a main group in the periodic table?

A

lanthanides

36
Q

Who is often considered to be the father of atomic theory?

A

Dalton

37
Q

Which postulate of Dalton’s atomic theory was proven wrong?

A

all matter is composed of atoms which are indivisible

38
Q

Which is not a postulate of Dalton’s atomic theory?

A

atoms can be broken into smaller pieces

39
Q

When was the atom discovered?

A

the 5th century BCE

40
Q

Why were two postulates of Dalton’s atomic theory proven wrong?

A

it was discovered that elements can have isotopes

41
Q

Which subatomic particle is positively charged?

A

proton

42
Q

Which experiment contributed to the discovery that atoms are mostly empty space?

A

gold-foil

43
Q

Which scientist conducted the oil drop experiment?

A

Millikan

44
Q

Which experiment calculated the charge of a single electron?

A

oil drop

45
Q

Which proposed model of the atom included a small positively charged nucleus?

A

Rutherford’s model

46
Q

Calculate the mass number of an atom with 10 protons, 9 neutrons, and 10 electrons.

A

19

47
Q

Which subatomic particle is negative?

A

electron

48
Q

Which subatomic particle is the least massive?

A

electron

49
Q

How many protons are in the following chemical symbol: lithium?

A

3

50
Q

What is the atomic number of the following chemical symbol: Carbon?

A

6

51
Q

The atomic number is…

A

the number of protons in an atom.

52
Q

__________ is the total number of protons and neutrons in an atom.

A

mass number

53
Q

Which of the following is not necessary information for calculating percentage abundance?

A

natural abundance

54
Q

An isotope contains different numbers of…

A

neutrons

55
Q

Which element has only one isotope?

A

fluorine

56
Q

Carbon is a…

A

nonmetal

57
Q

The periodic table was invented by…

A

Mendeleev

58
Q

Where are the radioactive elements located on the periodic table?

A

actinides

59
Q

Which is not a region of the periodic table?

A

periodic law

60
Q

How is the modern periodic table organized?

A

atomic number

General Chemistry - Chemistry I and Lab (10 decks)

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