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3 years ago

Highest energy level for lithium

Chemistry

1 answer:

Karo-lina-s [1.5K]3 years ago

3 0

QUESTION :

highest energy level for lithium

ANSWER :

There are 2 electrons on the first energy level and 1 electron on the second. Explain that the first energy level can only have 2 electrons so the next electron in lithium is on the next (second) level. Explain that neon has 10 protons and 10 electrons.

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What is happening to the temperature of the substance BEFORE AND AFTER the phase changes?

Neporo4naja [7]

First off, you must realize that the phase changes are marked by the points B and D on the graph. They are level because all of the energy (or heat) being added is being consumed by the physical process. So The temperature is increasing before the phase change, and after the phase change. The moments before and after are represented by points A, C, and E.

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3 years ago

How many moles react with 11 moles of oxygen

Zinaida [17]

I say it’s 9 moles , hope this is right

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3 years ago

Read 2 more answers

Can someone help with homework anyone? right now its science...

inna [77]

Answer:

Organ

Explanation:

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4 years ago

If 43.7 g of iron is completely used to produce 62.5 g of iron (III) oxide, how many grams of oxygen are involved in the reactio

Kobotan [32]

Mass of Oxygen : 18.8 g

<h3>Further explanation</h3>

Reaction(balanced) :

4Fe + 3O₂ → 2Fe₂O₃

mass Fe = 43.7 g

mol Fe(MW= 55,845 g/mol) :

$\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{43.7}{55.845}\\\\mol=0.783$

mol O₂ : mol Fe = 3 : 4, so mol O₂ :

$\tt \dfrac{3}{4}\times 0.783=0.5873$

Mass O₂(MW=32 g/mol) :

$\tt mass=mol\times MW\\\\mass=0.5873\times 32\\\\mass=18.7936~g\approx 18.8$

Or simply you can Conservation of mass, where the masses before and after the reaction are the same

mass reactants=mass products

mass iron+mass oxygen=mass iron (III) oxide

43.7 g + mass oxygen=62.5 g

mass oxygen = 62.5 - 43.7 = 18.8 g

5 0

3 years ago

The pressure atop the world’s highest mountain, Mount Everest, is usually about 33.6 kPa. Convert the pressure to atmospheres. H

melomori [17]

Answer: 0.33 atm

The pressure at Mount Everest is less as compared to pressure at seal level.

Explanation:

Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', 'kiloPascals' etc..

All these units of pressure are inter convertible.

We are given:

Pressure atop the world’s highest mountain, Mount Everest = 33.6 kPa mmHg

Converting this unit of pressure into 'atm' by using conversion factor:

1kPa= 0.0099 atm

$33.6kPa=\frac{0.0099}{1}\times 33.6=0.33atm$

Thus the pressure atop the world’s highest mountain, Mount Everest, is 0.33 atm

Standard sea-level pressure is 1 atmosphere.

Thus 0.33 atm at Mount Everest is less than 1 atm at sea level.

5 0

3 years ago

Highest energy level for lithium​

Highest energy level for lithium