review for semester 1 midterm exam. what is the difference between mass number and atomic mass?...
TRANSCRIPT
CATALYST
• Review for Semester 1 Midterm Exam.
What is the difference between mass number and
atomic mass?
OBJECTIVES
DATE: 11/05/2014
Reminders
• Thurs, Nov 6: Semester 1 Midterm
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• Wed, Nov. 19: Science Fair Paper and Board DUE
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100 points
200 points
Subatomic particles
Ions & Isotopes Density Atomic
structureMiscellaneou
s
100 100 100 100 100
200 200 200 200 200
300 300 300 300 300
400 400 400 400 400
500 500 500 500 500
Jeopardy Trash Ball
Subatomic Particles : 100
Where are neutrons located?
Back
Answer: In the nucleus
Back
Which subatomic particle has virtually NO mass?
Answer: Electrons
Subatomic Particles : 200
Back
Which subatomic particles make up most of an atom’s
mass?
Answer: The protons & neutrons
Subatomic Particles : 300
Back
Which particle is a proton attracted to?
Answer: an electron.
Subatomic Particles : 400
Back
As an electron gets further away from the nucleus, what happens to
the coulombic attraction?Answer: Decreases
Subatomic Particles : 500
Back
The mass number is determined by the number
of____and ____ in an atom?
ANSWER: Protons & Neutrons
Ions & Isotopes : 100
Back
If an Na atom has a mass number of 22, how many neutrons does it have?
Answer: 11 neutrons
Ions & Isotopes : 200
Back
If 1 proton were added to a hydrogen atom, what
would we name it?
Answer: Helium
Ions & Isotopes : 300
Back
If an element has 17 protons and 18 electrons, will it be a
cation or an anion? What is its identity?
Answer: anion (Cl1-)
Ions & Isotopes : 400
Back
Why is the average atomic mass
not a whole number ?
Answer: It is a WEIGHTED average of all the isotopes of that element
Ions & Isotopes : 500
Back
What is the formula for density?
Answer: D = M/V
Density : 100
Back
What is the formula to solve for mass (M=?)
Answer: M= V * D
Density : 200
Back
What is the density of a cube that has volume of 100 cm3
and mass of 10 g?
Answer: 0.10 g/cm3
Density : 300
Back
Which is more dense:
5 g of lead or 10 g of lead?
Answer: They have the same density.
Density : 400
Back
A gold statue has mass of 10 kg and density of 19.3 g/mL.
What is its volume?
Answer: 518.13 ml
Density : 500
Back
Where do we find electrons in an atom?
Answer: In the electron cloud
Atomic Structure : 100
Back
What is an atom mostly made up of?
Answer: empty space
Atomic Structure : 200
Back
What keeps an atom held together?
Answer: Coulombic Attraction
Atomic Structure : 300
Back
How did scientists discover the existence of electrons?
Answer: In the cathode ray tube, the stream of particles bent towards the
positively-charged plate.
Atomic Structure : 400
Describe Rutherford’s gold foil experiment and what it told us
about atoms.Answer: Rutherford shot alpha particles at a
piece of gold foil. Some particles were deflected but most passed through. This showed that the
atom is mostly empty space.
Back
Atomic Structure : 500
Back
Convert to scientific notation: 34,000
Answer: 3.4 x
Miscellaneous : 100
Back
20,000 mm = __?__m
Answer: 20 meters
Miscellaneous : 200
Back
What is mass?
Answer: The amount of matter in a substance
Miscellaneous : 300
Answer: They both change during an experiment. Independent changes because of the scientist. Dependent changes because of
the independent.
Back
Compare and contrast independent and
dependent variables.
Miscellaneous : 400
Answer: Electrons in the atoms are excited by energy and jump to higher energy level. When they jump back
down, they release energy in the form of photons. Each photon has a specific energy which has a specific
wavelength which corresponds to a specific color.
Back
Describe how colors are produced.
Miscellaneous : 500