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##############CEM
CEM 141 CHAPTER
141 CHAPTER
2 AND 3 LEARNING
2 AND 3 LEARNING
OBJECTIVES.pdf#########################################################
OBJECTIVES.pdfCEM 141 CHAPTER 2 AND 3 LEARNING OBJECTIVES.pdf
CEM 141 CHAPTER 2 AND 3 LEARNING
OBJECTIVES
- ANS-1s orbital
- ANS-P Orbitals
- The Big Bang
- 1 picosecond after no atoms
- 1 microsecond there were protons and neutrons
- Few minutes there was H O He and Li
- For 400K years temps dropped as the universe expanded.
- A billion years after, matter began to clump together.
- Gravitational attraction raised temp and stars formed.
- Within the stars, fusion restarted.
- Hydrogen formed Helium
- 3 helium nucleli could fuse to form carbon nuclei. - ANS-The chain of events that led from the
big bang to the atoms that make up our body:
#of protons - # core electrons - ANS-How to calculate Zeff:
Adding two nuclei together.
-At very high temps, electrons on atoms are stripped away (they have so much energy that they
can overcome the attraction to the nucleus) resulting in a plasma. - ANS-Nuclear fusion
Are low in energy and close to the nucleus- within the closed shell. - ANS-Core electrons
Atoms of a particular light cannot emit or absorb any wavelength of light. Spectra shows light
only of specific wavelengths/ energies. - ANS-Why is spectra direct evidence for the existence
of quantized energy levels in an atom?
Breaking a nucleus apart.
-The fragmentation of heavy nuclei to form lighter, more stable ones and energy.
-Neutrons released in the fission can induce more fissions leading to a chain reaction. -
ANS-Nuclear fission
Claim: Electromagnetic radiation is a particle.
Evidence: Photoelectric Effect
- When short wavelength shines on a metal surface, electrons are emitted. If the light intensity is
increased, more electrons are emitted. There is a threshold frequency below which no electrons
are ejected.
######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
CEM 141 CHAPTER 2 AND 3 LEARNING OBJECTIVES.pdf#########################################################
##############CEM
CEM 141 CHAPTER
141 CHAPTER
2 AND 3 LEARNING
2 AND 3 LEARNING
OBJECTIVES.pdf#########################################################
OBJECTIVES.pdfCEM 141 CHAPTER 2 AND 3 LEARNING OBJECTIVES.pdf
CEM 141 CHAPTER 2 AND 3 LEARNING
OBJECTIVES
- ANS-1s orbital
- ANS-P Orbitals
- The Big Bang
- 1 picosecond after no atoms
- 1 microsecond there were protons and neutrons
- Few minutes there was H O He and Li
- For 400K years temps dropped as the universe expanded.
- A billion years after, matter began to clump together.
- Gravitational attraction raised temp and stars formed.
- Within the stars, fusion restarted.
- Hydrogen formed Helium
- 3 helium nucleli could fuse to form carbon nuclei. - ANS-The chain of events that led from the
big bang to the atoms that make up our body:
#of protons - # core electrons - ANS-How to calculate Zeff:
Adding two nuclei together.
-At very high temps, electrons on atoms are stripped away (they have so much energy that they
can overcome the attraction to the nucleus) resulting in a plasma. - ANS-Nuclear fusion
Are low in energy and close to the nucleus- within the closed shell. - ANS-Core electrons
Atoms of a particular light cannot emit or absorb any wavelength of light. Spectra shows light
only of specific wavelengths/ energies. - ANS-Why is spectra direct evidence for the existence
of quantized energy levels in an atom?
Breaking a nucleus apart.
-The fragmentation of heavy nuclei to form lighter, more stable ones and energy.
-Neutrons released in the fission can induce more fissions leading to a chain reaction. -
ANS-Nuclear fission
Claim: Electromagnetic radiation is a particle.
Evidence: Photoelectric Effect
- When short wavelength shines on a metal surface, electrons are emitted. If the light intensity is
increased, more electrons are emitted. There is a threshold frequency below which no electrons
are ejected.
######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
CEM 141 CHAPTER 2 AND 3 LEARNING OBJECTIVES.pdf#########################################################
