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Ilya [14]
3 years ago
7

“Some types of vaccines need only one shot to protect you for the rest of your life. Other types, such as the one for seasonal f

lu, change from year to year and need to be given annually.”
What does the word annually mean?
Chemistry
2 answers:
IrinaK [193]3 years ago
8 0
Yearly, is the answer.
Elodia [21]3 years ago
4 0
The answer is yearly
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Manganese(IV) oxide is reduced to manganese(II) oxide by hydrogen gas. Include all phases in answer
liq [111]
<span><span>Mn<span>O<span>2<span>(s)</span></span></span>+<span>H<span>2<span>(g)</span></span></span>→Mn<span>O<span>(s)</span></span>+<span>H2</span><span>O<span>(g)</span></span></span></span>
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What is a cold front
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A cold front is the leading edge of a cooler mass of air, replacing at ground level a warmer mass of air, which lies within a fairly sharp surface trough of low pressure.
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3 years ago
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How is Earth's surface most likely to change in a cold place that experiences rainfall?
Ghella [55]

Answer:

I think the answer would have to be D

7 0
3 years ago
What is the mole ratio of hydrogen to nitrogen in the following reaction: N2(g) + 3H2(g) →
Nuetrik [128]

Answer:

3 mol H2/2 mol N2

Explanation:

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5 0
3 years ago
El pH de una solución acuosa 10^-14 M de ácido acético, a 25°C, es igual a, teniendo en cuenta que Ke = 1.76x10^-5
frez [133]

Answer:

pH=14

Explanation:

Hola!

En este caso, consideramos que la disociación de ácido acético ocurre:

CH_3COOH\rightarrow CH_3COO^-+H^+

Así, mediante la solución del equilibrio ácido, podemos calcular la concentración de iones hidronio que posteriormente sirven para calcular el pH de la solución, por tal razón, debemos calcular el equilibrio dada la constante de equilibrio y por medio de la ley de acción de masas en términos del cambio x como cualquier problema de equilibrio:

Ke=\frac{CH_3COO^-][H^+]}{[CH_3COOH]}\\\\1.76x10^{-5}=\frac{x*x}{1x10^{-14}M-x}

Resolviendo para x, tenemos x=0.999x10^{-14}

Así, la concentración de hidrógeno es igual a x, por lo que el pH:

pH=-log([H^+])=-log(0.999x10^{-14})\\\\pH=14

Dicho valor tiene sentido desde que la concentración de hidrógeno es casi despreciable, por lo que se puede asumir que tiende a ser básica.

Saludos!

5 0
4 years ago
Read 2 more answers
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