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WorksheetsChemistry Mid Term Review
Total questions: 57
Worksheet time: 1hrs 13mins
0.095 cm is the same as
0.95 mm.
0.095 m.
95. m.
0.0095 mm.
Which of these metric units would you use to measure length?
L
mg
kg
m
How many significant figures are in the measured value of 0.0058350 kg?
5
4
3
2
What is the density of 67.55 g of material with a volume of 8.30 cm³?
8.136 g/cm³
8.14 g/cm³
560. g/cm³
0.123 g/cm³
The nucleus of an atom has all of the following characteristics except that it
is positively charged.
is very dense.
contains nearly all of the atom’s mass.
contains nearly all of the atom’s volume.
What is a nuclear particle that has about the same mass as a proton, but has no charge?
electron
neutron
isotope
nuclide
How many protons, neutrons, and electrons are there for 48/22Ti2+?
p=26, n=22, e=22
p=26, n=22, e=26
p=22, n=26, 3=20
p=22, n=26, 3=24
Which statement below best describes why an atom is electrically neutral?
The number of protons and neutrons are equal.
The number of protons and electrons are equal.
The neutrons balance out the protons and the electrons.
The nuclear forces stabilize the charges, causing it to be a net neutral.
A sample of pure gold has a mass of 49.40 g. How many gold atoms are in the sample?
1.510 x 10^23 atoms
3.021 x 10^23 atoms
6.022 x 10^23 atoms
1.616 x 10^{-20} atoms
If repeated trials of measurements agree closely, but differ widely from the accepted value, they are
accurate, but not precise.
both precise and accurate.
precise, but not accurate.
neither precise nor accurate.
What is the number of atoms in 1 mol carbon?
12.01 x 10^22 atoms
12.01 x 10^23 atoms
6.022 x 10^22 atoms
6.022 x 10^23 atoms
What is the mass of a sample of arsenic that contains 3.01 x 10^23 atoms of arsenic?
11 g
72.6 g
37.4 g
59.3 g
Rutherford’s experiments led him to conclude that atoms contain massive, dense central regions that have
both protons and neutrons
a positive charge
a negative charge
no charge
What type of radiation would have a wavelength of 10−2m ?
x-rays
microwave
Long radio waves
infrared
A radiation has a wavelength of 525 nm. What color would this radiation give off?
blue
violet
red
green
Which characteristic of a substance is considered a chemical property?
its boiling point
its reactivity
its density
its conductivity
Which event always involves a chemical change?
boiling
melting
conducting
burning
6. Chicken noodle soup is an example of
Heterogeneous mixture
Homogeneous mixture
COFFEE IS
GAS
ELEMENT
HOMOGENEOUS MIXTURE
HETEREGENEOUS MIXTURE
Avogadro's number is approximately equal to:
3.141 x 10^23
9.999 x 10^22
1.234 x 10^24
6.022 x 10^23
An atom with an electrical charge is called an _____________.
Atom
Isotope
Covalent
Ion
A positively charged atom (more protons than electrons) is called a __________.
Anion
Cation
Isotope
A negatively charged atom (more electrons than protons) is called a __________.
Anion
Cation
Isotope
Atoms with the same number of protons but different numbers of neutrons (Carbon 14 and Carbon 12) are called ___________.
Anion
Cation
Isotope
The sun (or any star)
Nuclear Fusion
Nuclear Fission
What is the average mass of this element?
Medeleev's periodic table did not list all elements in order of increasing atomic mass because he grouped together elements with similar
properties.
atomic numbers.
names.
isotopes.
What does the number 91 represent in the name zirconium-91?
the atomic number
the number of protons
the mass number
the sum of protons and electrons
An atom has an atomic number of 32 and a mass number of 73. How many protons, neutrons, and electrons does this atom contain?
32 protons, 73 neutrons, 32 electrons
73 protons, 73 neutrons, 41 electrons
32 protons, 41 neutrons, 32 electrons
41 protons, 32 neutrons, 41 electrons
How does the isotopes carbon-12 and carbon-14 differ?
Carbon-12 has 12 neutrons; carbon-14 has 14 neutrons
Carbon-12 has 6 protons; carbon-14 has 8 protons
Carbon-12 has 6 neutrons; carbon-14 has 8 neutrons
Carbon-12 has 6 protons; carbon-14 has 6 protons
Which statement best describes the Quantum Mechanical model of the atom?
Electrons are arranged on a large, solid, positive center.
Electrons orbit around the nucleus in set paths.
Electrons have properties similar to waves.
Electrons make up most of the mass of an atom.
How many neutrons are present in the isotope 183/73 Ta5+?
73
181
110
84
If an element X has isotopes 14X (95% abundance), 15X (3% abundance), and 16X (2% abundance), what is the average atomic mass closest to?
14.07
15.00
14.00
16.00
Which scientist described a positively charged core (“nucleus”) in the middle of a lot of empty space?
Chadwick
Thomson
Rutherford
Bohr
Which scientist described an atom made of a solid positively charged substance with electrons dispersed throughout it?
Chadwick
Thomson
Rutherford
Bohr
146C --> 0-1e + ________
146C --> 0-1e + ________
What completes the equation?
alpha particle
beta particle
positron
gamma ray
Which radioactive particle has the same mass as an electron, but has a +1 charge?
alpha particle
beta particle
positron
gamma ray
