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wariber [46]
3 years ago
13

When someone’s immune system overreacts to something harmless it’s called:

Chemistry
2 answers:
ruslelena [56]3 years ago
5 0
I feel like it would be c
Mama L [17]3 years ago
3 0
The answer to this question is C. An allergy.
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WORD BANK:
ella [17]

Answer:

hot, less, rise, top, cold, closer, more, sink

Explanation:

I'm in high-school done this long time ago

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3 years ago
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An electron has an uncertainty in its position of 513 pm. What is the uncertainty in its velocity?
ella [17]
"The uncertainty<span> in </span>velocity<span> is Δv=1.05⋅105m/s . According to the Heisenberg </span>Uncertainty<span> Principle, you cannot measure simultaneously with great precision both the momentum and the position of a particle. m - the mass of an electron - 9.10938⋅10−31kg." 
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7 0
3 years ago
After 11.5 days, 12.5% of a sample of radon-222 that originally weighed 42g remains. What is the half-life of this isotope?
Bond [772]
Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value.  The equation to describe the decay is
Nt=N0(1/2) ^{t/t(1/2)}  where N0 is the initial quantity, Nt is the remaining quantity after time t, t1/2 is the half-time.  So work out the equation, t1/2 = t (-ln2)/ln(Nt/N0) = 11.5*(-ln2)/ln(12.5/100) = 3.83 days
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3 years ago
What is 1 item that is a compound?<br><br>Give an example of how the 1 item is a compound :D
spayn [35]

Water

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3 years ago
Help I don't understand balancing equations
Semmy [17]

Answer:

Explanation: so I can help you with this I show you can you some examples that I’ve done in the past years

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