Meg, Sandy, Chang, and Nathan used different methods to protect themselves from over-exposure to the sun. Their methods are listed below: Meg: Use a sun tanning or UV tanning booth instead of staying on the beach for long hours Sandy: Stop all outdoor activity and always stay indoors Chang: Apply sunscreen half an hour before going out and reapply every 2 hours Nathan: Use sunscreen with very low SPF once per day Who used the best method for daily activity?
Answers: 3
Chemistry, 22.06.2019 10:00, zionlopez543
Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.
Answers: 1
Chemistry, 22.06.2019 19:00, innocentman69
How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next
Answers: 1
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