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zhuklara [117]
3 years ago
13

Which of the following involves only a physical change *

Chemistry
2 answers:
notsponge [240]3 years ago
8 0

Answer:

A.

Explanation:

All the rest is Chemical Change

Anika [276]3 years ago
7 0

Answer:

A

Explanation:

Ur welcome hope it helps :)

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A sample is decomposed in the laboratory and found that it contains 52.2% carbon (C), 13.0% hydrogen (H), and 34.8% oxygen (O).
Andrej [43]
The empirical formula would be C2H6O
7 0
3 years ago
which atoms attains a stable valence electron configuration by bonding with another atom 1) neon 2) radon 3) helium 4) hyrdogen
Sergeu [11.5K]
Well, when an atom attains a stable valence electron, it means that the outer electrons are complete and so cannot attain any more electrons. For the first shell, it is complete when it has 2 electrons, the second shell is complete when it has 8 electrons, all the other shells also have a particular number when complete. Anyway, i believe the answer is HYDROGEN because when HYDROGEN combines with another atom of HYDROGEN, the outer shell is completed. This is because HYDROGEN has only 1 electron. If the two HYDROGENS, which both have 1 electron combine, they make the electrons 2, which is complete for the first shell, HYDROGEN ends in the first shell. Since the electrons become 2, the shell is at stable valence. In all the other options, this happens;
NEON- It has 10 electrons, 2 in the first shell and 8 in the second. So the the shells are already complete, so it can't bond with any thing, which is completely against the question.
RADON- Radon has 86 electrons.
HELIUM- Helium has 2 electrons, so the shell is already full, and cannot bond, so it goes against the question. The question says BY BONDING.
 So the answer is definitely 4) HYDROGEN
Hope i helped. Have a nice day, by the way, i'm very sure it's hydrogen.

3 0
3 years ago
C2H4(g) + H2(g) ----> C2H6(g)
sertanlavr [38]
D because wants you add the equation it should increase temp but decrease the value in pressure
4 0
3 years ago
Help please Chemistry
dybincka [34]

Answer:Cant see the picture cause its too big

Explanation:

7 0
3 years ago
What is Charles’s law? State the definition of the law in words. What are the assumptions of Charles’s law? Write mathematical e
Leviafan [203]

Answer:

The volume of a given mas of a gas is directly proportional to the temperature if the pressure remains constant

V is directly proportional to T

V=1/T

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Explanation:

4 0
3 years ago
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