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Chem exam 😒
Chem exam 😒
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Flashcards
56 cards
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Questions
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Answers
1
A volume of 1 millimeter is equivalent to
10-1 cubic decimeters
1 liter
1 gram
1 cubic centimeter
2
All Atoms of the same element have the same
Number of neutrons
Mass number
Atomic number
Atomic mass
3
Chlorine has atomic number 17 and mass number 35. It has
35 protons, 35 electrons, and 17 neutrons
17 protons, 17 electrons, and 18 neutrons
4
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called an)
Electron
Nuclide
Neutron
Isotope
5
Noble gases are in group 18, and are best known because they are..
Rare
Lanthanides
Excellent conductors
Unreactive
6
. The mass of 5,000 mol of cesium (atomic mass 132.9 amu) is
132.9 g
664.5 g
7
The liter is defined as
1000 c3
1000 m3
1000 cm3
1000 g3
8
The 2 most important properties of all matter are
Being brittle and hard
Being malleable and ductile
The ability to carry an electric current well and hold electric charge
Taking up space and having mass
9
All isotopes of hydrogen contain…
One proton
Two nuclei
Two electrons
One neutron
10
Which of these is the abbreviation for the SI base unit of time?
s
sec
h
hr
11
As the atomic number increases, the number of electrons in a neutral atom
Is undetermined
Increases
Remains the same
Decreases
12
The SI base unit for time is the
Day
Minute
Second
Hour
13
Which of these metric units is used to measure mass?
mm
m
g
L
14
The standard base for unit mass is the…
Meter
Cubic centimeter
Kilogram
Gram
15
An atom is
The smallest united of matter that maintains its chemical identity
Smallest unit of a compound
Always made of carbon
Smaller than an electron
16
In Rutherford’s experiments, alpha particles
Passed through a tube containing gas.
Were used to bombard a cathode plate
Collided with electrons
Were used to bombard thin metal foil
17
Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has
6 neutrons
8 neutrons
10 neutrons
18
Which of the following is an example of a heterogeneous mixture?
Sucrose
Seawater
Granite
A gold ring
19
How many moles of atoms are in 50.15 g of mercury (atomic mass 200.59 amu)?
0.1001 mol
0.2500 mol
0.4000 mol
0.1504 mol
20
Which of these symbols represents a unit of volume?
mm
cm
mg
mL
21
As the mass number of an element’s isotopes of an element increases, the number of protons
Remains the same
Increases
Doubles each time the mass number increases
Decreases
22
To determine the molar mass of an element, one must know the element’s
Avogadro constant
Average atomic mass.
Atomic number
Number of isotopes
23
All of the following are example of units except
gram
once
mass
kilometer
24
A physical change occurs when
Silver bowl tarnishes
Bracelet turns your wrist green
Glue gun melts a glue stick
Peach spoils
25
Phosphorus-33 (atomic number 15) contains
33 protons
33 neutrons
18 neutrons
26
Which is not a chemical change
Melting
Burning
Rusting
Igniting
27
Molar mass
Neither A nor B
B. Is numerically equal to the average atomic mass
A. Is the mass in grams of one mole of a substance
Both A and B
28
The number of atoms in 1 mol of carbon is
5.022 x 10^22
6.022 x 10^23
6.022 × 10 ^22
29
Because most particles fired at metal foil passed straight through, Rutherford concluded that
Atoms contained no charged particles
Atoms were mostly empty space
Electrons formed the nucleus
Atoms were indivisible
30
A nonmetal is usually
Brittle
Used to make jewelry
A good conductor
Malleable
31
Which is not a physical change
Boiling
Grinding
Cutting
Burning
32
In Rutherford’s Experiments, most of the particles
Passed through the foil
Were absorbed by the foil
Bounced back
Combined with the foil
33
The quantity of matter per unit volume is
density
inertia
mass
weight
34
Vertical columns on the periodic table are called?
Groups
Rows
Elements
Periods
35
A compound is
Sure buddy
Something science related
A pure substance that can’t be broken
A substance made of 2 or more atoms that are chemically bonded
36
Isotopes are Atoms of the same element that have different
Principal chemical properties
Masses
Number of electrons
Number of protons
37
Metalloids are often
Semiconductors
From outer space
Lanthanides
Unreactive
38
Which of the following is an example of a homogeneous mixture?
Orange juice
Marble
Raw milk
Air
39
Organic chemistry is the sutdy of
Carbon containing compounds
Properties,changes and relationships between energy
Crystals and minerals
The chemistry of living things
40
The mass of 2.0 mol of oxygen atoms( atomic mass 16.00 AMU) is
64 g
16 g
32 g
48 g
41
The most common form of hydrogen has
One neutron
Three neutrons
Two neutrons
No neutrons
42
The principles of atomic theory recognized today were conceived by
Bohr
Dalton
Avogadro
Rutherford
43
The atomic number of oxygen,7, indicates that there are eight
Energy Levels in the Oxygen Atom’s nucleus
Protons in the nucleus of an oxygen atom
Oxygen Nuclides
Neutrons outside the oxygen atom’s nucleus
44
If a mixture is uniform in composition, it is said to be
Heterogenous
A compound
Homogenous
Chemically bonded
45
Avogadro number is
the number of particles in exactly 1 gram of a pure substance.
the number of particles in 1 mole of a pure substance.
46
The mass of a sample containing 3.5 mol of silicon atoms (atomic mass 28.0855 amu) is approximately
98 g
72 g
35 g
28 g
47
Neon-22 contains 12 neutrons. It also contains
22 electrons
10 protons
12 protons
22 protons
48
Horizontals rows on the periodic table are called…
Elements
Periods
Actinides
Families
49
A sample of gold has a mass of 96.5 g and a volume of 5.00 cm’. The density of gold is
0.0518 g/cm3
483 g/cm3
19.3 g/cm3
101.5g/cm3
50
A measure of the quantity of matter is?
Mass
Volume
Weight
Density
51
The mass of 1 mol of chromium (atomic mass 51.996 amu) is
6.02 x 10^23 g
12 g
198 g
51.996 g
52
The total number of protons and neutrons in the nucleus of an atom is its
Atomic number
Mass number
Avogadro number
Average atomic mass
53
A homogenous mixture is also called…
A solute
A compound
Chemically bonded
A Solution
54
Whose series of experiments identified the nucleus of the atom?
Chadwick
Dalton
Bohr
Rutherford
55
The density of aluminum is 2.70 g/cm What is the mass of a solid piece of aluminum with a volume of 1.50 cm
1.80 g
4.20 g
4.05 g
0.556 g
56
A chemical change occurs when
ethanol is purified through distillation.
dissolved minerals solidify to form a crystal.
a leaf changes color in the fall.
salt deposits form from evaporated seawater.
