Life of Stars
What is fusion?
Fusion releases energy
True or False: there is no evidence to support the big bang theory.
False
What does wavelength tell you about energy level?
Longer wavelength = lower energy
How can you tell the difference between a mixture and a compound?
Mixtures are not chemically bonded
How does temperature affect reaction rate?
Higher temp = faster particles
Why is gravity essential to star formation?
Gravity pulls gas together
What elements are produced by the Sun right now?
Helium
True or false: short wavelength does equal high energy
True
What is chromatography used for?
Separating pigments
Explain why separating a compound requires a chemical reaction.
Bonds must be broken
True or False: fusion is not necessary for a start to shine.
False
What did the early universe look like?
Hot, dense plasma
What is the electromagnetic spectrum?
Range of all EM waves
What does solubility mean?
Ability to dissolve
How does surface area change reaction speed?
More surface = more exposed particles
How does the mass of a star affect its life cycle and death?
More mass → shorter life, hotter, die explosively
What happens to a star when it runs out of hydrogen fuel?
Star swells into red giant
Why is visible light only a small part of the spectrum?
Only wavelengths humans can detect
Why don’t dry erase markers separate in water?
They are not water-soluble
List 3 signs a chemical reaction occurred.
Temperature change, color change, gas, precipitate
Describe the stages of a star’s life from nebula to final stage.
Nebula → protostar → main sequence → red giant/supergiant → white dwarf, neutron star, or black hole
Explain the fusion reaction happening inside the Sun.
H + H + H + H → He + energy
List the EM waves from lowest to highest energy.
Radio → microwave → infrared → visible → UV → X-ray → gamma
Define element, compound, and mixture.
Element = 1 atom type; Compound = bonded atoms; Mixture = physical blend
What happens during a chemical reaction?
Atoms rearrange into new substances