Cem 141 Chapter 3 Origin of Atoms Exam Questions| Already answered| GRADED A+
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Cem 141
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Cem 141
Cem 141 Chapter 3 Origin of Atoms
Exam Questions| Already answered|
GRADED A+
in an infinitely dense moment 13.8 billion years ago, the Universe is born from a singularity. - ANSWER-
The Big Bang Theory
true - ANSWER-If thermal energy is spreading out it will eventually cool
a mysterious part...
Cem 141 Chapter 3 Origin of Atoms
Exam Questions| Already answered|
GRADED A+
in an infinitely dense moment 13.8 billion years ago, the Universe is born from a singularity. - ANSWER-
The Big Bang Theory
true - ANSWER-If thermal energy is spreading out it will eventually cool
a mysterious particle/force accelerates the expansion. - ANSWER-Inflation
after 380,00 years; loose electrons cool enough to combine with protons. The Universe becomes
transparent to light. The microwave background begins to shine. - ANSWER-Cosmic Microwave
Background (CMB)
clouds of dark hydrogen gas cool and coalesce(come together and form 1 mass/ whole). - ANSWER-Dark
ages
gas clouds collapse, the fusion of stars begins. - ANSWER-First Stars
gravity causes galaxies to form merge and drift. Dark energy accelerates the expansion of the universe
but at a much slower rate than inflation. - ANSWER-Galaxy Formation
true - ANSWER-Everything in the universe is moving away from us-with increasing speeds.
wavelength depends on what the observer is doing - ANSWER-Dopple effect
to long wavelength (towards the red end of the spectrum) - ANSWER-If an object emitting light is
moving away from us, which direction will the wavelength of the light be shifted?
, V=high energy , high frequency, short/low wavelength
R=low energy, low frequency, high/low wavelength - ANSWER-V I B G Y O R
true - ANSWER-Spectra of elements are more red shifted the farther away they are
Universe is expanding (red shift)
Computer Models
CMB (cosmic microwave background radiation) - ANSWER-What is our evidence that the Big Bang
occurred?
stars formed - ANSWER-Gravitational attraction raised temperature
Hydrogen burning (4 1H+ ---> 4He 2+ + 2e+ energy)
Helium burning (4 He 2+ ---> 12C6+ + energy) - ANSWER-Within the stars fusion restarted
-involve rearrangements (sharing, donating/ accepting) of valence electrons
-when an element undergoes a chemical reaction it never changes - ANSWER-Chemical reactions
-involve nucleus (not electrons)
-often result in change in element (since elements are defined by the number of protons)
-require a lot of energy
-fusion is a nuclear reaction
-you are changing the nucleus
-accompanied by changes in mass (the mass is converted into energy mass-energy equivalence: E=mc^2)
- ANSWER-Nuclear Reactions
K (potassium) - ANSWER-What element has an atomic number of 19?
have the same number of protons and different number of neutrons. - ANSWER-Isotopes
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