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riadik2000 [5.3K]
3 years ago
5

Why is each year's vaccine different?

Chemistry
2 answers:
Degger [83]3 years ago
5 0
Because the birds that fly overseas carry different flu viruses every year.
Gemiola [76]3 years ago
5 0

Answer:

Flu vaccinations are needed each year to ensure you have continuous protection. Though you may have received a flu vaccine last year, your body's immune system from previous vaccinations gradually decreases over time. By the time flu season comes around, your body's immunity to it is virtuality non-existent.

Explanation:

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Calculate the amount of heat required to raise the temperature of a 24 g sample of water from 9°C to 23°C.
borishaifa [10]

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1400KJ/mol⁻¹

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Amount of heat required can be found by:

Q = m × c × ΔT

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Q = 24 × 4.2 × (23 - 9)

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