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College Chemistry First Semester Review Flashcards | StudBud
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College Chemistry First Semester Review
College Chemistry First Semester Review
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1
A new element with atomic number 115 has been discovered. Element 115 will be most similar to:
bismuth
radon
radium
lead
2
Which of the following observations in the lab would indicate a chemical change had occurred?
All of the above.
The mixture suddenly got very warm.
The mixture formed bubbles.
The mixture changed colors.
3
How many total electrons does a bromide anion have?
33
34
35
36
4
Calculate the mass of an object that has a volume of 525.0 mL and a density of 3.60 g/mL
1890 g
146 g
0.0165 g
11.2 g
5
The atomic number of an element is the total number of which particle(s) found in the atom?
protons
electrons and protons
neutrons and protons
neutrons
6
Which of the following is the correct electron configuration for germanium?
1s22s22p63s23p64s2
1s22s23s24s25s24s26s27s25s24d10
1s22s22p63s23p63d104s2
1s22s22p63s23p64S23d104p2
7
What subatomic particle has a neutral charge?
neutron
atom
proton
electron
8
Which combination of elements is most likely to form an ionic compound?
hydrogen and oxygen
barium and fluorine
phosphorous and nitrogen
sulfur and chlorine
9
Which element has the smallest atomic radius?
tungsten
osmium
platinum
gold
10
Ca has 3 isotopes: calcium-40 calcium-42 calcium-44. Which isotope of Ca is the most abundant?
calcium-42
calcium-20
calcium-44
calcium-40
11
Which of the following has the symbol correctly matched to the number of protons and electrons?
F: 19 protons and 19 electrons
Zn: 30 protons and 60 electrons
In: 49 protons and 49 electrons
Cs: 55 protons and 78 electrons
12
Which group of the periodic table contains the most reactive metals?
alkali metals
boron group
lanthanides
transition metals
13
Arrange these elements in order of
lowest to highest
electronegativity:
Ga O P Rb
Ga, P, O, Rb
O, P, Ga, Rb
Rb, Ga, P, O
Rb, P, Ga, O
14
Which of the following is a qualitative observation?
The liquid is bubbling.
A liquid freezes at 18 deg C.
The liquid has a density of 1.2 g/mL.
A liquid boils at 122 deg C.
15
Isotopes of the same element have the same number of _____ but different number of ______
neutrons, electrons
protons, neutrons
protons, electrons
neutrons, protons
16
What lab equipment should be used to determine the density of an irregularly shaped object?
an electronic balance and a ruler
an electronic balance and a beaker
a graduated cylinder and a scale
an electronic balance and a graduated cylinder
17
All atoms of the same element have the same_____________________________________
molar mass
mass number
number of protons
number of electrons
18
How many e
-
are in outermost energy level of this atom 1s
2
2s
2
2p
6
3s
2
3p
4
6
4
8
10
19
What piece of lab equipment would be the best choice for measuring exactly 45.5 mL of solution?
a graduated cylinder
an Erlenmeyer flask
a beaker
an electronic balance
20
What subatomic particle has a negative charge?
atom
neutron
proton
electron
21
An unknown substance is found to conduct electricity when dissolved in water.
the compound could be carbon dioxide
the compound could be calcium chloride
the compound could be silicone
the compound could be table sugar
22
Which of the following is acceptable when performing a lab experiment?
Bunsen burners are ok to roast marshmallows with.
Chemicals can be placed directly on the electronic balance.
Goggles are only to be worn with flammable substances
Always ask the teacher if you are unsure about a procedure.
23
Which of the following is NOT a physical property of zinc metal?
When added to an acid will release hydrogen gas.
Has a dull gray appearance.
It has a density of 7.14 g/cm3.
It is a solid at room temperature.
24
Which of the following would be considered a chemical change?
slicing bread
cooking a hamburger
dissolving sodium chloride in water
boiling water
25
Which of the following was NOT part of the development of modern atomic theory?
Rutherford's positively charged nuclear model
Dalton's three particle theory
Thompson's plum pudding model with negative electrons
Bohr's planetary model with electrons in orbitals
26
Which piece of laboratory equipment is pictured below?
a volumetric flask
a beaker
an Erlenmeyer flask
a graduated cylinder
27
You observe an unknown chemical compound when dissolved in water does not conduct electricity.
the compound must be nonpolar covalent
the compound must be contaminated
the compound must be polar covalent
the compound must be ionic
28
Which describes how calcium's atomic radius will change when its atom loses 2 valence e
-
?
Calcium's atomic radius will increase in size.
Calcium's atomic radius will decrease in size.
Calcium's atomic radius will remain unchanged.
More information is needed.
29
The periodic table is used to identify an element by the number of ____________ in the nucleus.
electrons
neutrons
protons
particles
30
How many neutrons does lead-206 contain?
124
206
288
82
31
Which element has the electron configuration of 1s
2
2s
2
2p
6
3s
2
3p
6
4s
2
3d
6
?
slenium
iron
chromium
zinc
32
Which of the following is NOT an SI unit used in science?
milliliter
meter
pound
kilogram
33
What common characteristic determines how elements are grouped into columns on periodic table?
electron configurations
atomic mass
atomic radius
melting points
34
Identify the element in group 2, period 5 of the periodic table.
strontium
rubidium
calcium
niobium
35
Which element is a gas at room temperature and gains 3 valence electrons to form a -3 ion?
nitrogen
oxygen
sulfur
fluorine
36
In the lab you perform a flame test. Which is an explanation for the color observed?
light is released as electrons orbit the nucleus.
Light is rleased as electrons go back to ground state.
Light is given off as electrons absorb energy.
Light is released as electrons move to higher energy level.
37
Which of the following is a homogeneous mixture?
Italian salad dressing
solution of sulfuric acid
hydrogen peroxide(H2O2)
copper wire
38
Which element is most likely to be shiny and a good conductor of electricity?
hydrogen
silicon
xenon
chromium
39
Which of the following is a compound?
oxygen
calcium chloride
Kool-Aid
iron
40
Calculate the correct answer to the following problem to 3 sig figs:(1.85cm)X(8.80cm)X(30.5cm)=
496.5 cm3
496.54 cm3
500 cm3
497 cm3
