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kap26 [50]
3 years ago
5

Why must contact lenses be removed before you enter a chemistry laboratory?

Chemistry
1 answer:
RUDIKE [14]3 years ago
6 0
The vapors of some chemicals used in the chemistry laboratory, especially isocyanates, can react and bond the contact lens to the eye.

(FYI - the family of isocyanates include Superglue..I wouldn't want to have been the person who discovered this unfortunate reaction!)
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What have six valence electrons
irina1246 [14]

Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr). Oxygen, like all the other elements in group 16, has six valence electrons.

6 0
3 years ago
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A substance with a pH of 10 is how much more basic than a substance with a pH of 2?
Kazeer [188]

Answer:

The same holds true for pH values above 7, each of which is ten times more alkaline (another way to say basic) than the next lower whole value. For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8.

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3 years ago
A pound of margarine costs $1.39. What is the cost of a kilogram of margarine
den301095 [7]

Answer:

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Solution:

First of all we will find the number of pounds contained by one Kg. Therefore, it is found that,

                                    1 Kilogram  = 2.20462 Pounds

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So,

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Solving for X,

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                     X =  3.064 Dollars

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3 years ago
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