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3 years ago

8

What does energy mean please help

1 answer:

SIZIF [17.4K]3 years ago

3 0

Energy means the strength and vitality for sustained physical or mental activity.
Hope this helps:)

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A side reaction occurs when acid is added to the system. which species reacts with the acid?

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The reaction is a base

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3 years ago

(view the image) explain your answer please

geniusboy [140]

There is only one element with atomic mass 3 and it’s lithium and it only has 3 protons and 4 neutrons

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3 years ago

How is the polar vortex different from the jet stream?

kolezko [41]

The jet stream is a band of reliably strong wind that plays a key role in keeping colder air north and warmer air south. But when the vortex weakens, part of the weakened low-pressure system can break off. This breaking-off process is what causes a polar vortex.

Without that strong low-pressure system, the jet stream does not have enough force to maintain its usual path. It becomes wavy and rambling. When high-pressure systems get in its way, a collection of cold air pushes south, along with the rest of the polar vortex system

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3 years ago

A popular classroom demonstration consists of filing notches into a new penny and soaking the penny in hydrochloric acid overnig

Ivanshal [37]

Answer:

$HCl conc=2.2M$

Explanation:

From the question we are told that:

Mass of zinc $Mass_{z_n}=2.5g$

Initial conc of HCl $HConc_1=6.0M$

Initial volume of HCl $Hvol_1=20.0mL$

Molar mass of zinc $M_{Z_n}=65.38g/mol$

Generally the equation for reaction is mathematically given by

$2HCL+Zn\implies ZnCl_2 +H_2$

Generally the equation for moles of zinc $m_{z_n}$ is mathematically given by

$m_{z_n}=\frac{Mass_{Z_n}}{M_{Z_n}}$

$m_{z_n}=\frac{2.5g}{M_{65.38}}$

$m_{z_n}=0.038molZn$

Generally the equation for moles of $m_{HCl}$ is mathematically given by

$m_{HCl}=HConc_1*Hvol_1$

$m_{HCl}=6.0M*20.0mL$

$m_{HCl}=6.0M*20.0*10^{-3}L$

$m_{HCl}=0.12\ mol\ HCl$

Generally the reacted moles of HCl $HCl_[reacted]$ is mathematically given by

Since

Zn:HCl =1:2

Therefore

$HCl_[reacted]=0.038*\frac{2}{1}$

$HCl_[reacted]=0.076mol \ HCl$

Generally the moles of HCl after Zn oxidization X is mathematically given by

$x=0.12-0.076$

$x=0.044 mol HCl$

Generally the conc of hydrochloride acid X is mathematically given by

$X=\frac{0.044}{0.020}$

$X=2.2 M Hcl$

Therefore Conc of HCl

$HCl conc=2.2M$

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3 years ago

Joan wants to test if salt lowers the temperature at which water boils. In two or more complete sentences, describe the best way

Alexeev081 [22]

Put a thermometer in the water and wait until it boils. When it boils record the temperature and compare it to the normal water boiling point.

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3 years ago