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WorksheetsChemistry Midterm Practice
Total questions: 43
Worksheet time: 59mins
In an atom, an orbital represents
the most probably location of a proton
the most probable location of an electron
the least probably location of a neutron
photons emitted as electrons move to lower energy levels
Which particle has a mass so small, it is considered to be 0 amu?
proton
hydrogen nucleus
neutron
electron
During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms
are gained by the atoms
are lost by the atoms
move to higher energy states within the atoms
move to lower energy states within the atoms
What quantity is the same among atoms of the same element?
mass number
atomic number
number of neutrons
number of nucleons
An atom that has 8 protons and 10 neutrons is an isotope of the element
nitrogen
oxygen
fluorine
neon
How would you classify NaCl?
element
compound
heterogeneous mixture
homogeneous mixture
Rutherford discovered what subatomic particle through his experimentation?
The proton
The neutron
The electron
The quark
Thomson concluded that cathode rays have a negative charge. Why did his experiment lead him to this conclusion?
Opposite charges attract
Like charges attract
Opposite charges repel
Like charges repel
In his experiment, Rutherford concluded that atoms have a nucleus because
most of the particles went straight through the foil.
some of the particles were deflected near the front of the screen.
some of the particles were deflected back towards the alpha source.
not enough information is given.
What element is represented in this Bohr Model?
Carbon
Hydrogen
Aluminum
Lithium
When can atoms emit photons?
When the electron is in the ground state
When the electron is in the excited state
When an electron is going from the ground state to the excited state
When an electron is going from the excited state to the ground state
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
20.22%
19.85%
26.64%
28.64%
If light has a wavelength of 400 nm (4x10-9 m), what is its frequency?
8.2x1023
7.5x10-16
7.5x1016
7.5x104
What does "c" stand for in the equation for a wave?
The speed of an electron
The crest
The speed of light
The frequency
What does "h" stand for in the energy equation for a wave?
The Speed of Light
Planck's Constant
The Wavelength
The Height of the Wave
Long wavelength = _______ frequency
Low
High
No
Unknown
Short wavelength = _______ energy
Low
Unknown
High
No
When electrons transition from one energy level to the next, they produce bands of light with ___________.
Definite Wavelengths
Unknown Wavelengths
Random Wavelengths
Varying Wavelengths
What is the best description of a hypothesis?
A question or problem that can be solved through experimentation.
What you perceive with your senses.
An educated prediction to the answer of a stated problem, based on research and prior knowledge.
An experiment set up to observe and collect data on how something happens, or to test the hypothesis.
What is the best description of an experiment?
A question or problem that can be solved through experimentation.
What you perceive with your senses.
An educated prediction to the answer of a stated problem, based on research and prior knowledge.
An test / situation set up to observe and collect data on how something happens, or to test the hypothesis.
In an experiment where the only variable you change is the temperature, temperature is the
independent variable.
dependent variable.
Noticing that sugar tastes sweet is a(n)
qualitative observation.
quantitative observation.
Which of the following has the most energy?
Red
Blue
Green
Yellow
