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3 years ago

What draws water back to earth

Chemistry

2 answers:

spayn [35]3 years ago

7 0

Gravity is the force that draws water back to the earth in the forms of rain, sleet and, snow.

kap26 [50]3 years ago

3 0

Earth forms rain sleet and snow

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In class, students were given the following problem: "Aluminum satellite dishes resist corrosion because aluminum reacts with ox

Alexeev081 [22]

Hello!

the correct setup is shown at bottom of your question

we get

total moles*(1/102.0 g/mol)= total grams Al2O3

hope this helps. any questions please ask. thank you kindly

7 0

3 years ago

the molar enthalpy of formation of carbondioxide is -393kjmol. calculate the heat released by the burning of 0.327g of carbon to

Arte-miy333 [17]

This is equivalent to having a standard enthalpy change of reaction equal to 10.611 kJ

<u>Explanation</u>:

The standard enthalpy change of reaction, Δ H ∘ , is given to you in kilojoules per mole, which means that it corresponds to the formation of one mole of carbon dioxide.

C (s] + O 2(g] → CO 2(g]

Remember, a negative enthalpy change of reaction tells you that heat is being given off, i.e. the reaction is exothermic.

First to convert grams of carbon into moles,

use carbon's molar mass(12.011 g).

Moles of C = mass in gram / molar mass

= 0.327 g / 12.011 g

Moles of C = 0.027 moles

Now, in order to determine how much heat is released by burning of 0.027 moles of carbon to form carbon-dioxide.

= 0.027 moles C $\times$ 393 kJ

Heat released = 10.611 kJ.

So, when 0.027 moles of carbon react with enough oxygen gas, the reaction will give off 10.611 kJ of heat.

This is equivalent to having a standard enthalpy change of reaction equal to 10.611 kJ

7 0

3 years ago

Is air an element, compound or mixture? explain your answer

emmainna [20.7K]

It is a mixture because the compounds that make up air e.g. oxygen (o2), Carbon dioxide (co2) and the most important Nitrogen which is an element and makes up 78.09% of air are not chemically bound in the way that compounds are because they can be separated easily and there has been no change in state to any of the compounds or elements in air!hope this helpful!

3 0

3 years ago

Read 2 more answers

Explain how you would separate a mixture of water, sand, salt and iron filings into its four component parts.

katen-ka-za [31]

You would use the density difference to separate the sand, evaporate the water out (the water vapor will cool back to water if collected). Then use a magnet to get the iron fillings out of the salt.

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3 years ago

How many atoms are in 5.2 moles of Na ?

Nastasia [14]

One mole of a substance is defined by Avogadro as consisting of 6.022 x 1023 atoms. This is Avogadro's number. To calculate the number of atoms in two moles of sodium, use dimensional analysis. 2.0 moles Na x 6.022⋅1023g1mol=1.20⋅1024 atoms of Na

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3 years ago