Worksheetshonors chem Unit 1 review
Total questions: 40
Worksheet time: 23mins
Negatively charged particle
proton
neutron
electron
Neutral charge particle
proton
neutron
electron
Positively charge particle
proton
neutron
electron
Which device did JJ Thomson use to discover the electron?
X-ray machine
scanning tunneling electron microscope
spectrometer
cathode ray tube
The atomic model associated with Thomson is the
plum pudding or chocolate chip cookie model
nuclear model
planetary model
the electron cloud model
Which is a finding attributed to Rutherford's Gold Foil Experiment?
atoms are indivisible and have a dense positive nucleus.
atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.
atoms are like plum pudding with positive and negative charges uniformly scattered throughout the atom.
atoms are mostly empty space with a dense positive nucleus.
What evidence did Rutherford use to support the idea that the atom was mostly empty space?
the vast majority of the alpha particles went through the foil unaffected.
the vast majority of the alpha particles were deflected at 90 degrees.
one alpha particle was deflected by the gold foil.
beams of alpha particles were deflected by magnets.
According to J.J. Thomson's atomic model, negatively charged particles are embedded in
a uniformly positive "dough"
a "dough" of neutral charges
A nucleus
A "dough" of small atoms
Which of these model was made by Thomson
None of these
Thomson developed a new model of the atom, where the entire atom is ______________ and negative electrons float within it.
neutral
an element
weakly positive
made of electrons
This scientiest used cathode rays to experiment with atoms.
Rutherford
Dalton
Thomson
Millikan
This scientist used alpha particles to discover the nucleus
Thomsan
Dalton
Democritus
Rutherford
Which experiment was used to discover the nucleus of the atom?
cathode ray tube
gold foil experiment
heisenberg's uncertainty principle
flame test experiment
Rutherford, Dalton, Bohr, Thomson
Which of the following is the best evidence that the particles that make up a cathode ray had a negative charge?
The particles were produced by many different metals.
The ray was deflected toward a positive electric field.
Line emission spectra for an element are always the same.
The ray caused a phosphorescent screen to glow.
Which of the following is/are conclusions based on Rutherford’s gold foil experiment?
Atom is mostly empty space
The nucleus is positively charged
The atom has a small dense nucleus
All answers are correct
What results did Rutherford observe in his Gold-Foil experiment?
He observed that all alpha particles did go through a gold-foil in straight lines
He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.
He observed that a small number of alpha particles bounced off the gold-foil at very large angles
He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil
Which of the following is the BEST statement for proving the positive nature of the nucleus?
the negative electrons are attracted to the positive nucleus
the positive alpha particles were deflected when they come near the nucleus
the greater the thickness of the gold foil, the more the particles bounce back
none of these answers are convincing pieces of evidence
Energy levels in Bohr's model of an atom could be described as ...
Orbits with fixed energies where an electron moves around an atom
Orbits with a wide range of energies where an electron moves around an atom
Choose the correct description for an electron cloud
A cloud in the sky
A fixed circular path around the nucleus of an atom where an electron is located. It has well defined path.
the 3D location of the electron in the Probability Model of the atom where there is likely to be found. It doesn't have well defined borders.
Which orbit has the lowest energy level in the Bohr's model of an atom?
The orbit that is the fatherst away from the nucleus of the atom
All orbits in the atom have the same energy
The orbit that is the closest to the nucleus of the atom
It is possible to know the exact location and speed of an electron at the same time
false
true
the electrons don't have any speed
electrons have only 1 specific location
The nucleus of an atom ....
is very large
is extremely small
takes up about half of the space in the atom
takes up all of the space in the atom
What force holds the nucleus of an atom together?
Electric force
Strong nuclear force
Weak nuclear force
Repulsive force
According to the __________________, electrons exist in a region of space around the nucleus of the atom.
Nuclear Model
Simple Model
Plum Pudding Model
Probability Model
What model is shown in the image?
Simple model
Plum Pudding Model
Probability Model
Bohr Model
What is the currently accepted model of the atom?
Simple model
Plum Pudding Model
Probability Model
Bohr Model
In the chocolate chip cookie model, the "DOUGH" was thought to have a(n)…
Average charge of 5
Negative charge
Positive charge
Neutral charge
How did the Gold Foil experiment DISPROVE the chocolate chip cookie model of the atom? (2 answers)
The chocolate chip cookie model didn't account for a nucleus in the center; the α-particles bounced off this nucleus
The α-particles bounced off the electrons in the center of the atom
The α-particles that got close enough to the nucleus were curved/deflected
The α-particles turned into energy and cooked the cookie which is delicious
The electrons were too small to deflect the α-particle
Ultimately, the probability model had electrons in ______ around the nucleus
Specific orbits
Nodes
Waves
Clouds
