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matrenka [14]
3 years ago
7

Melissa uses a sunscreen with an spf rating of 20. what does this does this mean?

Chemistry
1 answer:
Olin [163]3 years ago
4 0
If the SPF rating is 20 then it means it would provide 20 times the protection instead of no sunscreen and 20 times longer someone would take before the person started to burn or in this case 200 minutes. 
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When something heats up, new energy is created, and when something cools down, energy is destroyed. agree disagree
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Disagree because in the law of conservation of mass, it states energy cannot be created or destroyed
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Do you believe the research subjects in the original study were appropriate for this experiment
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2 years ago
Jerry listed the following process on his notebook:
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Answer:

2

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2 years ago
If the rate of decomposition of ammonia, NH3, at 1150 K is 2.10 x 10-6 mol/L/s, what is the
Alina [70]

Answer:

3.15 × 10⁻⁶ mol H₂/L.s

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Step 3: Calculate the rate of production of N₂

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2.10 × 10⁻⁶ mol NH₃/L.s × 1 mol N₂/2 mol NH₃ = 1.05 × 10⁻⁶ mol N₂/L.s

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