Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ALL 11th GRADE CLASSES > CHEMISTRY:TOPIC ONE > Flashcards

CHEMISTRY:TOPIC ONE Flashcards

1
Q

the concept that matter is composed of timy discrete particles is generally attributed to the

A

greeks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

the first subatomic particle discovered was the

A

electron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

according to the law of the conservation of mass, if the products of a reaction have a mass of 64 g, then the total mass of the reactants

A

must be equal to 64g

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

the gold foil experiment led scientists to conclude that an atoms

A

volume is mainly unoccupied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

the model of the atom that pictured the atom with electrons stuck randomly throughout the mass of the atom was called

A

plum pudding model

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

after bombarding a gold foil sheet with alpha particles, scientists concluded that atoms mainly consist of

A

empty space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

experimental evidence indicated that the nucleus of an atom

A

contains most of the mass of the atom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

daltons atomic theory states that

A

atoms of a given element must be identical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

modern theory pictures an electron as

A

both a particle and a wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the major differences between the plum pudding and planetary models of the atom

A

the planetary model contains a nucleus and electrons orbiting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

why did rutherford conclude that the atom was mostly empty space

A

most alpha particles went through it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is a major difference between the rutherford and the wave mechanical models of the atom

A

the electrons are in orbitals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

the atomic mass of an element is defined as the weighted average mass of that elements

A

naturally occuring isotopes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

element x has two isotopes. If 72% of the element has an isotomic mass of 84.9 amu and 28% has an isotopic mass of 87 amu, the average atomic mass of element x is numerically equal to

A

(0.720)(84.9) + (0.280)(87)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

a neutral atom with 6 electrons and 8 neutrons is an isotope of

A

carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

the major portion of an atoms mass consists of

A

neutrons and protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

atoms of 16O, 17O, and 18O have the same number of

A

protons but a different number of neutrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

a neutron has approximately the same mass as

A

a proton

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

the total number of protons and neutrons in the nuclide 35 over 17 Cl is

A

35

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what si the nuclear charge of an atom with a mass of 23 and an atomic number of 11

A

11+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

compared to the charge and mass of a proton, an electron has

A

an opposite charge and a smaller mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

when electrons in an excited state fall to lower energy levels, energy is

A

released

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

the characteristic bright line spectrum of an atom is produced when

A

electrons move from higher to lower energy levels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

when the electrons of an excited atom fall back to lower energy levels, the emission of energy produces

A

spectral lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what particle or particles contribute to the mass number of an atom

A

protons and neutrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

compare the charge and mass of an electron and a neutron

A

electron is negative with no mass
neutron is neutral with 1 amu

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

which atom in the ground state contains one completely filled p orbital

A

neon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

what is the total number of electrons in the second principal energy level of a calcium atom in the ground state

A

8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

what is the total number of occupied s orbital in an atom of nickel in the ground state

A

4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what is the total number of occupied principal energy levels in a neutral atom of neon in the ground state

A

2

31
Q

in an atom of lithium in the ground state, what is the total number of orbitals that contain only one electron

A

1

32
Q

what is the total number of completely filled principal energy levels in an atom of argon in the ground state

A

3

33
Q

what is the total number of electrons needed to completely fill all the orbitals in an atoms second principal energy level

A

8

34
Q

what is the total number of sublevels in the fourth principal energy level

A

4

35
Q

what sublevel contains a total of five orbitals

A

d

36
Q

what is the maximum number of electrons that can occupy the fourth principal energy level of an atom

A

32

37
Q

what is the total number of unpaired electtrons in an atom of exygen in the ground state

A

2

38
Q

what is the total number of completely filled sublevels found in an atom of krypton in the ground state

A

4

39
Q

Which of the following cannot be decomposed by chemical means
1 sodium
2 ethanol
3 sucrose
4 water

A

Sodium 

40
Q

A compound differs from an element in that a compound

A

Can be decomposed by chemical reaction

41
Q

A compound differs from a mixture and a compound always has a

A

Homogenous composition

42
Q

A pure substance that is composed only of identical atoms is classified as

A

An element

43
Q

Most elements are

A

Metals

44
Q

What is a characteristic of all mixtures?

A

Their compositions may vary

45
Q

Heterogeneous material may be

A

A mixture

46
Q

Which of these materials is a mixture, water air, methane, or magnesium?

A

Air

47
Q

Each particle contained in hydrogen gas is made up of two identical, hydrogen atoms chemically joined together. hydrogen gas is 

A

An element

48
Q

Which of the following materials is a pure substance air water fire or earth

A

Water

49
Q

What is an identifying characteristic of a mixture

A

A mixture can be separated by physical means

50
Q

Which substance can be decomposed by chemical change, ammonia, aluminum, magnesium, or manganese?

A

Ammonia

51
Q

The model of the atom that pictured the atom with electrons traveling in circular orbits, was called the

A

Planetary model

52
Q

If 14 g of substance X reacts completely with 16 g of substance Y to form the product XY the mass of XY

A

Will be 30

53
Q

Compared to the entire out of the nucleus of the atom is

A

Smaller and contains most of the atoms mass

54
Q

In a famous experiment, positively charged particles were aimed at a thin sheet of gold foil, the results of the experiment were that

A

A few of the particles were repelled showing that the gold has a positive core

55
Q

Neutral atoms must contain equal numbers of

A

Protons and electrons

56
Q

What is true about a compound but not a mixture

A

The composition of a compound does not vary

57
Q

Compared with an electron proton has

A

More mass and an opposite charge

58
Q

The total number of electrons in a neutral atom of any element is always equal to the atoms

A

Number of protons

59
Q

All isotopes of neutral atoms of sodium have

A

11 protons and 11 electrons

60
Q

An atom in the excited state contains

A

More potential energy than an atom in the ground state

61
Q

As an electron moves from the excited state to the ground, state the potential energy of the electron

A

Decreases

62
Q

What particle has the smallest mass?

A

Electron

63
Q

An element occurs as a mixture of isotopes. The atomic mass of the element is based upon

A

Both the masses and the relative abundance of the individual isotopes

64
Q

100 g of a clear liquid is evaporated in a few grams of the white crystals remain the original liquid

A

Homogenous mixture

65
Q

What does different percentages mean? In a word problem?

A

That it is heterogeneous

66
Q

Two samples of bronze a uniform material are analyzed and found to contain different percentages of tin. Based on this information bronze is likely a

A

Heterogeneous mixture

67
Q

Many companies around the world, manufacture, ammonia what does this mean?

A

No matter where it is manufactured, it will have the same composition

68
Q

What is the charge on a particle that contains nine protons 10 neutrons and nine electrons

A

It’s neutral

69
Q

An element has two isotopes, 90% of the isotopes have a mass number of 20 amu you while 10% have a mass number of 22 amu you the atomic mass of the element

A

Is closer to 20amu than to 22amu

70
Q

If the atomic number of a neutral element is 35 and its nucleus contains 40 neutrons, which is the following correct 1 the atom is bromine and it has 35 electrons in
2 the atom is bromine, and it has a mass number of 40
3the atom is zirconium and it has a mass number of 75.
4 The atom is zirconium and has 40 electrons.

A

The atom is bromine and it has 35 electrons

71
Q

An atom of chlorine 35

A
  1. Protons 18 neutrons and 17 electrons.
72
Q

A moon sample was analyzed in a lab. The carbon in the sample was found to be 97.78% carbon 12 and 2.22% carbon 13 according to these data what is the atomic mass of carbon 

A

12.0222

73
Q

What model did Ernest Rutherford perform?

A

Nuclear model

ALL 11th GRADE CLASSES (41 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions