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2.1a Atomic Structure & Mole Conversions Flashcards | StudBud
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2.1a Atomic Structure & Mole Conversions
2.1a Atomic Structure & Mole Conversions
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1
What does the number 84 in the name krypton-84 represent?
the atomic number
the mass number
the sum of the protons & electrons
twice the number of protons
2
How many molecules of water are in 1.000 mole of water?
6.022 x 1023
144
18.02
12
3
How many moles of aluminum are present in 3.70 x 10
20
atoms of aluminum? Remember SF!
6.14 x 10-4
2.23 x 1044
2.2 x 1044
6.1 x 10-4
4
Which of the following isotopes has the same number of neutrons as phosphorus-31?
phosphorus - 32
chlorine - 31
silicon - 29
sulfur - 32
5
Consider this nuclear symbol. Which of the following is NOT true?
iodine has 53 protons
iodine has 172 neutrons
neutral iodine has 53 electrons
the mass number of this isotope is 119
6
What unit is used to measure average atomic mass?
mole
angstrom
kilogram
amu
7
Isotopes of the same element have different
atomic numbers.
numbers of neutrons.
numbers of electrons.
numbers of protons.
8
The mass number of an element is equal to
a constant number for the lighter elements.
the total number of electrons in the nucleus.
the total number of protons and neutrons in the nucleus.
less than twice the atomic number.
9
Who used the gold foil experiment, and what did they find?
Dalton, the atom
Rutherford, the nucleus
Thomson, the electron
Chadwick, the neutron
10
Convert 0.75 moles of potassium to grams of potassium. Remember Significant Figures!
1.2 x 10-24 g
29 g
4.5 x 1023 g
29.3 g
11
How do you find the molar mass of a substance?
Divide by 6.022 x 1023
Multiply by 6.022 x 1023
It's always 6.022 x 1023
It is the atomic mass written in grams
12
How do the isotopes hydrogen-1 and hydrogen-2 differ?
hydrogen-2 has one neutron; hydrogen-1 has none
hydrogen-2 has two protons; hydrogen-1 has one
hydrogen-2 has one proton; hydrogen-1 has none
hydrogen-2 has one more electron than hydrogen-1
13
The number 6.022 x 10
23
is also referred to as
A Dozen
A Gross
Avocado's number
Avogadro's number
14
If an atom has more protons than electrons it is:
a cation
impossible to tell without neutrons
neutral
an anion
15
Which of the following statements is NOT true?
The nucleus of an atom is positively charged.
Electrons have a mass of 1 amu.
Protons have a positive charge.
Neutrons are located in the nucleus.
16
12.01 g carbon = 1 mole carbon
True
False
17
The atomic mass of an element is the
average of the mass # and the atomic # for the element.
total # of subatomic particles in it's nucleus
total mass of the isotopes of the element.
weighted average of masses of the isotopes of the element
18
An element has an atomic number of 76. The # of protons and electrons in a neutral atom of this
152 protons and 76 electrons
76 protons and 76 electrons
76 protons and 0 electrons
38 protons and 38 electrons
19
How many atoms of carbon are in 1.000 mole of carbon?
12.01
6.022 x 1023
12
144
20
The atomic number of an element is the total number of which particle(s) in the nucleus?
protons
neutrons
protons and neutrons
electrons
21
All atoms of the same element have the same
number of neutrons.
number of protons.
mass.
mass numbers.
22
How many protons, electrons and neutrons does an atom with atomic # 50 and mass # 125 contain?
50 protons, 75 electrons, 120 neutrons
50 protons, 75 electrons, 50 neutrons
50 protons, 50 electrons, 75 neutrons
75 protons, 50 electrons, 70 neutrons
23
What is the average atomic mass of an element with the following three isotopes?
131.26 amu
326.08 amu
132 amu
130.34 amu
24
Which of the following is NOT a part of Dalton's atomic theory?
All elements are composed of atoms.
Atoms that combine do so in simple whole number ratios.
Atoms are always in motion.
Atoms are indivisible.
25
An atom of oxygen has 10 electrons. Which of the following pairs is correct?
neutral atom
cation, 2+ charge
cation, -6 charge
anion, 2- charge
26
Dalton's atomic theory included which idea?
The nucleus is comprised of protons and neutrons.
Atoms of different elements always combine in 1-to-1 ratios.
Individual atoms can be seen with a microscope.
Atoms of the same element are always identical.
27
Which of the following equals one atomic mass unit?
the mass of 1 helium-4 atom
1/12 the mass of 1 carbon-12 atom
the mass of 1 electron
the mass of 1 carbon-12 atom
28
A student needs 0.366 mole of zinc for a reaction. What is the mass of zinc in grams? Remember Significant Figures!
0.00563g
23.79g
23.9g
177.6g
29
The sum of the protons and neutrons in an atom equals the
mass number
atomic number
nucleus number
atomic mass
30
Who conducted experiments to determine the charge of an electron?
Dalton
Rutherford
Thomson
Chadwick
31
What did Chadwick discover?
neutrons
protons
atoms
electrons
32
How many atoms of magnesium (Mg) are in 2.5 moles of magnesium? Remember significant figures!
4.15 x 10-24
4.2 x 10-24
1.5 x 1024
1.5055 x 1024
33
The smallest particle of an element that still retains the properties of that element is a(n)
neutron
electron
atom
proton
34
The particles that are found in the nucleus of an atom are
neutrons and electrons
protons only
electrons only
protons and neutrons
