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Cerrena [4.2K]
3 years ago
10

Select the event that marks the beginning of the instrumental period of climate history.

Biology
1 answer:
tigry1 [53]3 years ago
5 0

Incomplete question. The options read;

a) routine and widespread usage of thermometers starting in 1860

b) invention of the mercury thermometer by Daniel Fahrenheit in 1714

c) first temperature recording by an orbiting weather satellite in 1979

d) use of ocean-going vessels to measure marine air temperatures in 2000

Answer:

<u>b) invention of the mercury thermometer by Daniel Fahrenheit in 1714</u>

Explanation:

The definition of climate would lack proper understanding if not for the invention by Daniel Fahrenheit in 1714. Historians agree that Daniel's mercury thermometer allowed many other researchers to understand how much temperature existed in a particular environment or climate.

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Una solución de 0.204 M de NaOH seutiliza para neutralizar 50 mL de una solución de H3PO4. Si se necesitaron 16.4 mL de la soluc
vfiekz [6]

Answer: 0.05 M

Explanation:

Para responder esta pregunta, hay que tener en cuenta la Ley de Conservación de la Masa. <u>La misma indica que en una reacción química en un sistema cerrado, la masa total de las moléculas que participan permanece constante.</u> Esto significa que la masa utilizada en los reactivos es la misma que la masa de los productos generados.

En este problema, se cuenta con una solución de NaOH (hidróxido de sodio) tiene una molaridad de 0.204 (siendo la molaridad el número de moles por litro de solución) y se utilizan 16.4 mL de dicha solución para agregarla a 50 mL de una solución de H3PO4 (ácido fosfórico).

Entonces, ya que la masa de ambas soluciones no se pierde, podemos utilizar la ecuación de la Ley de Conservación de la Masa:

Concentración inicial x Volumen inicial = Concentración final x Volumen final.

Concentración inicial: 0.204 M

Volumen inicial: 16.4 mL

Concentración final: ?

Volumen final: 50 mL + 16.4 mL = 66.4 mL

Reemplazamos los valores en la ecuación:

0.204 M x 16.4 mL = Concentración final x 66.4 mL

La molaridad de la solución de H3PO4 es de 0.05 M.

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