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Chem: Unit 2 Atomic Theory / Nuclear Reactions Midpoint quiz Flashcards | StudBud
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Chem: Unit 2 Atomic Theory / Nuclear Reactions Midpoint quiz
Chem: Unit 2 Atomic Theory / Nuclear Reactions Midpoint quiz
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Unit 2 Quiz
Flashcards
20 cards
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Practice quiz
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Host live
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Questions
20
Answers
1
The mass # is defined as what?
# of neutrons and # of electrons
# of neutrons and # of electrons
# of protons and # of neutrons
# of protons and # of electrons
2
What subatomic particle was discovered first?
Electron
Proton
Neutron
Lepton
3
The atomic number of Silver (Ag) is?
79
60
47
107
4
Which part of Dalton's atomic theory is
still
correct?
Atoms of an element are identical
Atoms are like a box of chocolates.
Atoms never change into other elements in a chemicalreaction
Atoms are indivisible
5
Rutherford's Gold Foil experiment confirmed the existence of what?
The proton
The nucleus
The electron cloud
The neutron
6
How many significant figures does 145.01 have?
3
5
4
6
7
Thomson's "Plum Pudding model" can be described as?
Positively charged matter dotted with electrons
Negatively charged matter dotted with electrons
Neutral matter dotted with electrons
Positively charged matter dotted with positrons
8
An alpha particle (α) is composed of what?
A neutron
A hydrogen nucleus
A helium nucleus
An electron
9
In the following nuclear reaction, what is the mass number of the newly formed carbon atom?
9
13
6
12
10
Hydrogen-3 has how many neutrons?
2
3
1
0
11
Empty question
74
180
127
53
12
Isotopes differ from one another because of what?
The # of electrons they have
The # of protons they have
The # of nuclei they have
The # of neutrons they have
13
Element P has 8 protons and 32 neutrons, Element Q has 7 protons and 33 neutrons. These are?
Covalently bonded
Cousins, once removed, on your mom's side
Isotopes
Different elements
14
Empty question
17
18
35
19
15
An atomic mass unit is defined as:
1/12th the mass of a carbon-12 atom
The mass of a helium nucleus (alpha particle)
The mass of a hydrogen atom
1/6th the mass of a carbon-12 atom
16
How many significant figures will the answer have: 4.1 + 10.015?
3
2
1
4
17
The atomic mass of Oxygen (O) is?
15.99
31.98
12.01
14.01
18
If Vicki earns $10/hr at her job, how much does she make in a week? (5 days= 1wk, 1 day=8 hrs)
$50
$850
$80
$400
19
In a neutral atom, what relationship exists between the # of protons and the # of electrons?
42
They equal the mass #
They equal the atomic #
They equal the mass # minus the atomic #
20
Beta particles penetrate objects ____________ than alpha particles.
Farther
Less
The same
Neither
