Review for Semester 1 Midterm Exam. What is the difference between mass number and atomic mass?...
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Transcript of Review for Semester 1 Midterm Exam. What is the difference between mass number and atomic mass?...
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
• Mon, Nov 10: Science Fair Paper Rough Draft DUE
• Wed, Nov. 19: Science Fair Paper and Board DUE
Science Fair Judges
• Recruit judges for the Science Fair• Judges must be +21 years old• Judges must have a background
in science–College students majoring in
science–Engineers
Science Olympiad
• Interested in science competitions? Join the Von Science Olympiad Team!
• Fill out the application by Nov 8 on the Von Steuben site!
Von Bridge Competition
Date: Monday, December 15, 2014
Task: Construct a bridge that withstands the most weight.
Winners: Travel to IIT and Compete against various schools. Scholarships and t-shirts may be available.
Interested? Sign up with Ms. Roden in 215 - after school on Monday before December 1st, 2014
VON Homework CafeMonday – Thursday
2:45 pm – 4:00 pm in the cafeteria• Snacks and computer access available!• Each time you attend, you will be
entered into a raffle. Drawings are held every 2 weeks. –The more you attend, the better your
chance to win gift cards, Von gear, dance tickets, etc…
Recycle Ball• One team picks a category and a point value.
• 15 seconds to discuss with team.
• I will randomly draw a name from the team to answer the question – no more discussions with group!
• If the team gets the correct answer, they get to shoot for more 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
Back
Which subatomic particles make up most of an atom’s
mass?
Answer: The protons & neutrons
Subatomic Particles : 300
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 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
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
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