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WorksheetsHistory Quiz Mania
Total questions: 15
Worksheet time: 17mins
When comparing the Bohr model and the modern quantum model which of the following ideas was NOT retained about the Bohr model?
Most of the volume of an atom is empty space.
Electrons can absorb or emit energy as photons.
Electrons move around the nucleus as planets orbiting the sun.
Atoms have a central positively charged nucleus.
Which of the following explanations applies to all their models?
All matter is composed of tiny, discrete particles called atoms.
Electrons orbit the nucleus of an atom at distinct energy levels.
Atoms are composed of positively and negatively charged particles.
Atoms are mostly composed of empty space.
In the quantum model of the atom, what does the shape of the atomic orbital represent?
the entire range of allowed positions for an electron at a particular energy level within the atom
the probable location of an electron as described by the electron cloud
the exact volume in space around the nucleus in which an electron in a specific energy level can be found
the exact location of an electron as determined by experimental data
When an atomic nucleus emits a beta particle, what happens to the atomic number of the atom?
It increases by two.
It decreases by one.
It decreases by two.
It increases by one.
Which of the following best explains the data?
The half-life of the isotope is 10 minutes.
After 2 half-lives there are approximately 5.5 grams.
The half-life of the isotope is 5 minutes.
After 25 minutes approximately 25% remains.
Which sample has molecules with the highest average kinetic energy?
Sample 1
Sample 2
Sample 3
Sample 4
What is the boiling point of hydrogen at atmospheric pressure (100000 Pa)?
12 K
14 K
33 K
20 K
When someone, standing at one end of a large room opens a bottle of bleach it may take several minutes for a person at the other end of the room to smell it. Gas molecules at room temperature move at very high velocities, what is responsible for the delay in detection of the bleach?
Increase in the air space occupied by the bleach molecules
Attractive forces between the air and the bleach molecules
A chemical reaction with nerves, which is slower than other sensory processes
Random collisions between the air and the bleach molecules
An atom of the element fluorine can be represented by the Bohr model shown. If the mass number of this atom is 19, how many neutrons are present?
9
10
19
28
Carbon and silicon are located in group 14 (4A) on the periodic table. How are carbon and silicon different?
Carbon has an atomic mass of 6, and silicon has an atomic mass of 14.
Carbon has 2 shells of electrons, and silicon has 3 shells of electrons.
Carbon has 12 electrons, and silicon has 28 electrons.
Carbon has 14 protons, and silicon has 28 protons.
What can measure the average speed of particles?
clock
thermometer
radar
meter stick
Who discovered the electron?
Dmitri Mendeleev
John Dalton
JJ Thomson
Ernest Rutherford
Chemical reactions can NOT be
reversible
phase changes
oxidation
caused by electrons
Convert 2400 mL into liters.
2.4 L
240 L
24 L
0.24 L
What is the molar mass of NaCl?
28.00
32.62
58.44
87.50
