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Ch 2 & 4 Test Review Flashcards | StudBud
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Ch 2 & 4 Test Review
Ch 2 & 4 Test Review
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1
What does the number 84 in the name krypton-84 represent?
twice the number of protons
the mass number
the atomic number
the sum of the protons and electrons
2
Which of the following is a chemical property?
densiity
freezing point
ability to react with oxygen
hardness
3
How do the isotopes hydrogen-1 and hydrogen-2 differ?
Hydrogen-2 has two protons; hydrogen-1 has one.
Hydrogen-2 has one proton; hydrogen-1 has none.
Hydrogen-2 has one neutron; hydrogen-1 has none.
Hydrogen-2 has one more electron than hydrogen-1.
4
The smallest particle of an element that retains the properties of that element is a(n) ____.
electron
atom
proton
neutron
5
What is the relative mass of an electron?
1/1840 the mass of a C-12 atom
1/1840 the mass of an alpha particle
1/1840 the mass of a neutron + proton
1/1840 the mass of a hydrogen atom
6
What distinguishes a substance from a mixture?
substances are compounds, mixtures are not
the same substances have different intensive properties
mixtures contain elements, compounds do not
mixtures seperate physically, not compounds
7
How many neutrons does an atom with atomic number 50 and mass number 125 contain?
75
125
50
100
8
Which of the following is a physical change?
rotting of food
explosiion
evaporation
corrosion
9
A chemical change occurs when a piece of wood ____.
is split
decays
is painted
is cut
10
What happens to matter during a chemical reaction?
matter is neither created nor destroyed
some matter is destroyed
some matte is destroyed, some created
some matter is created
11
Which of the following was originally a tenet of Dalton's atomic theory?
Atoms of the same element are identical
atoms of all elements are the same size
individual atoms can be seen with a microscope
Atoms of different elements always combine in 1-to-1 ratios
12
Isotopes of the same element have different ____.
positions on the periodic table
mass numbers
atomic numbers
chemical behavior
13
How many protons does an atom with atomic number 50 and mass number 125 contain?
125
100
75
50
14
Which of the following is a heterogeneous mixture?
soil
air on a calm day
salt water
steel
15
All of the following are physical properties of matter EXCEPT ____.
condensing
ability to rust
boiling point
magnetism
16
How many electrons does an atom with atomic number 50 and mass number 125 contain?
50
75
125
100
17
The particles that are found in the nucleus of an atom are ____.
neutrons & electrons
electrons only
protons & electrons
protons & neutrons
18
Which state of matter expands when heated and is easy to compress?
all of the above
liquid
solid
gas
19
The sum of the protons and neutrons in an atom equals the ____.
atomic mass
a mass number
atomic number
nucleus number
20
Which of the following equals one atomic mass unit?
the mass of one carbon-12 atom
one-twelth the mass of one carbon-12 atom
the mass of one electron
the mass of one helium-4 atom
21
The nucleus of an atom is ____.
positively charged & is composed of protons & neutrons
positively charged and has more protons than neutrons
negatively charged and has a high density
negativley charged and has a low densiity
22
Which of the following is true about compounds?
their composition can vary
they are substances
can be physically seperated into their component elements
their properties are the same as their individual elements
