3 years ago

Why is burning of plastics not considered a good method for their disposal?

1 answer:

6 0

Plastics release chemicals and fumes when burned which can harm the enviroment around them. A good method for their disposal would be recycling them so they can later be used as something else.

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What element has 4 valence electrons and 5 electron shells?

marta [7]

Answer: Tin (Sn)

Explanation: The electron configuration for tin (Sn) is shown in the picture. It's last electrons are:

5s^2 4d^10 5p^2

The valence electrons are in the 5th electron shell and include 2 each in the 5s and 5p orbitals.

8 0

3 years ago

9.11 x 10^3 in standard notation?

Irina18 [472]

Answer:

the right answer is 9110

3 0

2 years ago

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8. Skin cancer is a disease that occurs when skin cells grow in an uncontrolled way. It can be caused by UV

Levart [38]

Answer:

Explanation:

I think none of the above, because when caused by a UV light it damages the cells. And if enough builds up overtime it causes uncontrollable growth and leads to skin cancer.

Hope that helped? It might be another answer honestly.

3 0

2 years ago

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

Ber [7]

Sc(21), Cr(24), Fe(26), Zn(30)

4 0

3 years ago

A sealed container holding 0.0255 L of an ideal gas at 0.979 atm and 67 ∘ C is placed into a refrigerator and cooled to 41 ∘ C w

Aliun [14]

Answer:

$0.904 atm$

Explanation:

Using Gay Lusaac's law where there is no change in Volume. The pressure changes directly proportional to absolute T°

P₁/T₁ = P₂/T₂

P₁T₂/T₁

P₂ = $\frac{0.979 atm * 314k }{340k}$

P₂ = $0.904 atm$

5 0

3 years ago