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JulijaS [17]
3 years ago
12

A substance is examined under a high-power electron microscope. The substance is found to contain only one type of atom.

Chemistry
1 answer:
Zielflug [23.3K]3 years ago
4 0

Answer:

It is a solution

Explanation:

I know that because a solution is something you mix and you have to use a microscope if you really wanna see what's in there

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The reaction of Fe3O4(s) with hydrogen(g) to form iron(s) and water(g) proceeds as follows: Fe3O4(s) + 4 H2(g) 3 Fe(s) + 4 H2O(g
Reptile [31]

Answer:  151 kJ

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}  

\text{Moles of} Fe_3O_4=\frac{61.8g}{231.5g/mol}=0.267moles

Fe_3O_4(s)+4H_2(g)\rightarrow 3Fe(s)+4H_2O(g)

It is given that:

0.267 moles of Fe_3O_4 absorb energy = 40.3 kJ

Thus 1 mole of Fe_3O_4 absorb energy =\frac{40.3}{0.267}\times 1=151kJ  

Thus the value of \Delta H for the chemical equation given is 151 kJ

4 0
3 years ago
Propane burns in air to produce carbon dioxide and water?
Elan Coil [88]
Hey there!
Great question=)

Yes, this statement is true! Propane burns in air and it produces carbon dioxide and water.

I hope this helps;)
6 0
3 years ago
Write the four quantum numbers of the outermost two electrons in the atom of calcium
sveticcg [70]

Answer:

Its electron configuration is: 2 electrons in the K shell (principal quantum number 1), 8 in the L shell (principal quantum number 2), 8 in the M shell (principal quantum number 3), and 2 in the N shell (principal quantum number 4).

Explanation:

Hope this helped!!! xoxo

t!kt0k: preppydreams

6 0
3 years ago
Perform an online search to find the structures of the compounds in the questions that follow. Provide a method for separating t
Vedmedyk [2.9K]

The chemical separation method for two of the above named mixtures or compound indicated above are explained below.

<h3>What is a Chemical compound?</h3>

A chemical compound is a material generated by the chemical union of two or more elements in set quantities.

<h3>What are the separation methods?</h3>

<u>Benzophenone and tributylamine</u>

The combination of benzophenone and tributylamine is in diethyl ether (given in question). Tributylamine is a base that may readily be changed to a water soluble salt by adding an aqueous acid.

Add dilute aqueous acid to the solution. The amine salt will be present in the aqueous layer, whereas benzophenone will be present in the ether layer. A separatory funnel will isolate levels.

<u>Fluorenone, octanoic acid, and dicyclohexylamine</u>

Fluorenone, Octanoic acid, and dicyclohexyl amine: The combination comprises both an acid (octanoic acid) and a base (dicyclohexyl amine) (dicyclohexyl amine).

Add the diluted aqueous base to the solution (like NaCO3). Divide the two layers.

The acid is present in the aqueous layer as a salt, while the fluorenone and amine are present in the ether layer.

Add weak aqueous acid to this combination of fluorenone and dicyclohexyl amine.

Divide the two layers. The amine is present in the aqueous layer, and fluorenone is present in the ether.

Learn more about chemical separation at;
brainly.com/question/17143033
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<u></u>

5 0
2 years ago
DETERMINE THE MASS 1.22 mol sodium
horsena [70]

Answer:

28.06g

Explanation:

number of moles = <u>Reacting </u><u>mass</u>

Molar mass

number of moles = 1.22mol

Molar mass of sodium= 23g/mol

So therefore, 1.22 = <u>Reacting </u><u>mass</u>

23

Reacting mass = 23×1.22

Reacting mass = 28.06g

4 0
3 years ago
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