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jekas [21]
3 years ago
13

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or

a compound? give reasons
Chemistry
1 answer:
gogolik [260]3 years ago
7 0

I'd say it is an element. It is not a compound, it doesn't do things on its own like us. It's an element like fire and water.

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One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
kenny6666 [7]

Answer:

Lithium oxide, Li₂O.  

Explanation:

Hello!  

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

M_2O+H_2\rightarrow 2M+H_2O  

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

5.00gM_2O*\frac{1molM_2O}{(2*X+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{XgM}{1molM}=2.32gM  

Thus, we perform the operations in order to obtain:

\frac{10X}{(2X+16)}=2.32  

So we solve for x as shown below:

10X=2.32(2X+16)\\\\10X=4.64X+37.12\\\\X=\frac{37.12}{10-4.64}\\\\X= 6.93g/mol  

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.  

Best regards!

8 0
3 years ago
When a nonmetal bonds with a nonmetal, they form a(n)
seropon [69]
Covalent bonds would be formed when a non-metal bonds with another non-metal 
6 0
3 years ago
When 2,4-hexadiene is protonated, a resonance-stabilized secondary allylic carbocation is formed. Draw the curved arrow notation
NemiM [27]

Answer:see the image for the structure of the allylic carbocation

Explanation:

When 2,4-hexanediene is protonated at the 5-position as shown in the image, a carbonation is formed which can be stabilized by resonance. The positive charge can be found on carbon 4 or carbon 2 due to resonance of the allylic carbonation. The both structures are shown and electron movements were depicted using curved arrow notation in the structures shown in the image attached.

4 0
3 years ago
Does this equation follow the Law of Conservation of Mass (Yes or No)
notka56 [123]
Yes I think it’s look right to me
3 0
3 years ago
Which of the following is a renewable resource?
spayn [35]

Answer:

Wind

Explanation:

Wind is renewable because we have an unlimited amount unlike coal, oil, and natural gas.

7 0
3 years ago
Read 2 more answers
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