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pogonyaev
3 years ago
5

When Kristen was five, she became sick with chickenpox and then recovered. What claim explains why Kristen is unlikely to get ch

ickenpox a second time? *
A. Kristen has developed a vaccine against chickenpox.
B. Kristen has not developed antibodies to chickenpox.
C. Kristen’s body no longer contains cells that can be damaged by chickenpox.
D. Kristen’s body has memory cells that will produce antibodies to fight chickenpox.
be quick plz!!
Chemistry
2 answers:
VLD [36.1K]3 years ago
5 0

Answer:

the answer is A!

Mark as brainless

Rudik [331]3 years ago
5 0
Answer:

A. Kristen has developed a vaccine against chickenpox

Please mark me as brainliest( ^ω^ )
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There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. Cac
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Answer:

The equation that gives the overall equilibrium in terms of the equilibrium constants K and Ky is K1 = K^6 * Ky

Explanation:

we have the following balanced reaction:

CaC2 + 2H2O = C2H2 + Ca(OH)2

the value of K for this reaction will be equal to:

K = ([C2H2] * [Ca(OH)2])/([CaC2] * [H2O]^2)

if we multiply the reaction by the value of 6, we have:

6CaC2 + 12H2O = 6C2H2 + 6Ca(OH)2

Again, the value of K for this reaction will be equal to:

K,´ = ([C2H2] ^6 * [Ca(OH)2]^6)/([CaC2]^6 * [H2O]^12) = K^6

For the second reaction:

6C2H2 + 3CO2 + 4H2O = 5CH2CHCO2H

The value of K for this reaction:

K2 = ([CH2CHCO2H]^5)/([C2H2]^6 * [CO2]^3 * [H2O]^4)

we also have:

K1 = ([CH2CHCO2H]^5)/([C2H2]^6 * [CO2]^3 * [H2O]^16)

Thus:

K1 = K^6 * Ky

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Which is the best example of how electromagnetic energy is used in everyday life?
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A sample of a compound contains 160 g of oxygen and 20.2 g of hydrogen. Give the compound's empirical formula.
Maslowich
Amount of oxygen in the compound = 160 g
Amount of oxygen in the compound = 20.2 gm
Mole of oxygen in the compound = 160/16
                                                     = 10 moles
Mole of hydrogen in the compound = 20.2/1.01
                                                         = 20 moles
Then
The ratio of oxygen to ration of hydrogen = 1:2
So
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