Show:
Balancing Equations
Nuclear Chemistry
Nuclear Chemistry
Universe
Universe
100
What are the compounds that start a chemical reaction called?
reactants
100
What is located in the nucleus?
protons and neutrons
100
Which size nucleus tends to be more stable: large or small?
small
100
What event started the universe?
Big Bang
100
What law or phenomenon tells us that the universe is expanding?
Hubble's law or red shift
200
What is a balanced chemical equation?
same number of atoms on each side
200
What is the name of the force that holds the nucleus together?
Nuclear force
200
What is a half-life?
amount of time for half of substance to decay/break down
200
What formed first in the universe: stars, gas clouds, galaxies, or atoms?
Atoms
200
What does the color of a star tell you?
Temperature
300
What is the only thing you are allowed to do to balance a chemical equation?
Add or change coefficients
300
What is the name of the force that forces protons apart and tries to force the nucleus apart?
Electrical
300
What is the type of nuclear radiation in which smaller nuclei combine to form larger nuclei, like in stars?
Fusion
300
What is a cloud of gas that forms a star called?
Nebula
300
What force is responsible for creating stars and galaxies?
Gravity
400
What law says that equations must be balanced?
Law of conservation of mass/matter
400
In an unstable nucleus, which force is greater: the nuclear or electrical?
electrical
400
After 3 half-lives, how much of the original sample would be left?
1/8
400
For a star to begin shining, what reaction has to happen in its core?
Fusion of H into He
400
On an H-R diagram, where are the white dwarfs located?
Bottom left
500
Balance the following equation: MgCl2 + Al2O3 ---> AlCl3 + MgO
3MgCl2 + Al2O3 ---> 2AlCl3 + 3MgO
500
What happens to the strength of the electrical force as the nucleus gets bigger and bigger?
Increases
500
Sodium-25 has a half-life of 1 minute. How much of a sample that originally contained 200 g would be left after 4 minutes?
12.5 g
500
What two factors affect the luminosity of a star?
brightness, temperature, mass
500
What type of stars are located on the top right side of an H-R diagram?
Red supergiants