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maksim [4K]
3 years ago
10

List the following elements in order from smallest atomic radii to largest: Cr, Fe, Zn, Sc

Chemistry
1 answer:
Ber [7]3 years ago
4 0
Sc(21), Cr(24), Fe(26), Zn(30)
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1) A 10g sample of H2(g) reacts with a 22g sample of O2(g) according to
solmaris [256]

Answer:

H₂ is excess reactant and O₂ the limiting reactant

Explanation:

Based on the chemical reaction:

2H₂(g) + O₂(g) → 2H₂O

<em>2 moles of H₂ react per mole of O₂</em>

<em />

To find limiting reactant we need to convert the mass of each reactant to moles:

<em>Moles H₂ -Molar mass: 2.016g/mol-:</em>

10g H₂ * (1mol / 2.016g) = 4.96 moles

<em>Moles O₂ -Molar mass: 32g/mol-:</em>

22g O₂ * (1mol / 32g) = 0.69 moles

For a complete reaction of 0.69 moles of O₂ are needed:

0.69mol O₂ * (2mol H₂ / 1mol O₂) = 1.38 moles of H₂

As there are 4.96 moles,

<h3>H₂ is excess reactant and O₂ the limiting reactant</h3>
7 0
3 years ago
What must be true for a substance to be able to dissolve in water?
JulsSmile [24]
B. i think not 100% sure 
6 0
3 years ago
All of the following are examples of allotropes of carbon EXCEPT Choose the one alternative that best completes the statement or
Leona [35]

Answer:

quartz

Explanation:

<em>The correct option would be </em><em>quartz.</em>

<u>Allotropy is a phenomenon that describes the natural existence of the same element in different forms with different physical characteristics. Allotropes are therefore different forms of the same element.</u>

Carbon as an element has several allotropes which include diamond, graphite, graphene, amorphous carbon, and fullerenes. Quartz is a crystalline solid that is composed of silicon dioxide and not carbon.

Hence, all the options are carbon allotropes except quartz.

4 0
3 years ago
Which is most like a scientific model?
timama [110]

answer maybe an element

4 0
3 years ago
Read 2 more answers
Draw the structures for the following compounds:<br>2-methylpropane<br><br>​
-Dominant- [34]

Answer:

Structure of 2-methylpropane.

Explanation:

The given compound is 2-methyl propane.

Propane has three carbons in their parent chain and all are bonded by a single bond.

And the second carbon has methyl group.

The structure of 2- methyl propane is as follows.

8 0
3 years ago
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