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