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General Chem Midterm Review Flashcards | StudBud
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General Chem Midterm Review
General Chem Midterm Review
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midterm review
Flashcards
30 cards
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Questions
30
Answers
1
What would not be classified as acceptable lab behavior
Wearing goggles
Wearing tennis shoes
Using a Bunsen Burner
Breaking glassware and not telling a teacher
2
The energy of a photon is related to its
speed
frequency
mass
size
3
What are the atomic number and mass number of this atom?
The atomic number is 11 and the mass number is 20.
The atomic number is 9 and the mass number is 19.
The atomic number is 11 and the mass number is 19.
The atomic number is 9 and the mass number is 20.
4
Most of the volume of an atom is occupied in the
electron cloud
nucleus
nuclides
protons
5
Which historical observation was first used to understand the structure of the atom?
Gases subjected to high voltages show specific behaviors.
Elements combine in varying ratios to produce new compounds.
Electrons in H atoms occupy quantized energy levels.
Bombarding gold foil with alpha particles scattered them.
6
Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils has
14 neutrons
6 neutrons
8 neutrons
10 neutrons
7
What is the total number of electrons in an atom of potassium?
18
20
39
19
8
The modern model of the atom is based on the work of
one scientist over a short period of time
one scientist over a long period of time
many scientists over a long period of time
many scientists over a short period of time
9
A quantum of electromagnetic energy is called a(n)
excited atom
electron
photon
orbital
10
Which sample contains particles in a rigid, fixed, geometric pattern?
H2O(l)
KCl(s)
CO2(aq)
HCl(g)
11
What rule for states that electrons double up only when necessary?
Hund's Rule
Aufbau Principle
Pauli Exclusion
Mrs. Stephans Principles
12
The mass of 5.000 mol of cesium is
664.6 g
132.9 g
5.000 g
6.022x1023 g
13
Which statement identifies the element arsenic?
Arsenic has an atomic number of 33.
An atom of arsenic has eight valence electrons.
Arsenic has a melting point of 84 K
An atom of arsenic in the ground state has radius of 146 pm.
14
A substance always has a ratio of 2.67 g of O to 1.0 g of C.What best describes this substance?
heterogeneous mixture
homogeneous mixture
compound
element
15
If measuring 3.0 grams of table salt on a balance
none of the above
use a weighing boat, hit tare and then add 3.0 g of salt
eyeball the amount
place the salt directly on the balance
16
Density is (make sure you know this equation)
found by dividing mass by volume
found by multiplying mass and volume
17
Which of these measurements has only nonsignificant zeros?
506 mL
60.0 mL
0.0037 mL
400. mL
18
Which of the following measurements contains three significant figures?
200 mL
0.02 mL
200.0 mL
20.2 mL
19
Which particle model diagram represents only one compound composed of elements X and Z?
4
2
3
1
20
Which statement is true about the charges assigned to an electron and a proton?
An electron is negative and a proton is positive.
Both an electron and a proton are positive.
An electron is positive and a proton is negative.
Both an electron and a proton are negative.
21
Which sequence represents an increasing level of energy in electromagnetic radiation?
visible light, microwaves, X-rays, ultraviolet
ultraviolet, visible light, X-rays, microwaves
X-rays, ultraviolet, microwaves, visible light
microwaves, visible light, ultraviolet, X-rays
22
We know that air is a mixture and not a compound because
its composition can vary.
it is colorless.
it can be heated to a higher temperature.
it can be compressed to a smaller volume.
23
Recovering the salt from a mixture of salt and water could best be accomplished by
paper chromatography
density determination
evaporation
filtration
24
In the wave-mechanical model, an orbital is a region of space in an atom where there is
a high probability of finding an electron
a circular path in which electrons are found
a high probability of finding a neutron
a circular path in which neutrons are found
25
The most important properties of matter are:
taking up space and having mass
ability to carry charge
being malleable and ductile
being brittle and hard
26
Which statement describes a chemical property of iron?
Iron combines with oxygen to form rust.
Iron can be flattened into sheets.
Iron conducts electricity and heat.
Iron can be drawn into a wire.
27
The following piece of equipment is called a
graduated cylinder
evaporating dish
mortar and pestle
clamp
28
An emission line spectrum is produced when an electron moves from one energy level
to a lower energy level
to a higher energy level
to another position in the same sublevel
into the nucleus
29
The accuracy of a measurement
is how close it is to the true value.
indicates that the measurement is also precise.
does not depend on the instrument used to measure the object
is something that scientists rarely achieve.
30
What would be an acceptable reading of the graduated cylinder? (to correct number of sig figs)
35.55 mL
36.5 mL
36 mL
35 mL
