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Margaret [11]
3 years ago
8

How has scientists' understanding of the atoms changed over time?

Chemistry
1 answer:
Viefleur [7K]3 years ago
8 0
They discovered more and more objects with different numbers of atoms. which gave them a better understanding
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5. Give one advantage of KIO3 as primary standard.​
alexdok [17]

Answer:

one advantage of KLO3 as a primary standard is that it is used to know concentration of a solution.

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The reaction provides confirmation that the solution is at a specific concentration. Primary standards are often used to make standard solutions (a solution with a precisely known concentration

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When an apple or banana is cut, a chemical reaction with air causes the flesh to turn brown. Placing the fruit in a cold place,
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Apples turn brown when exposed to air because it undergoes aerial oxidation.  Due to this, when the inside of the apple is exposed to the air containing oxygen and water, it turns brown. When apple is uncut, skin of the apple protects it from this process. 


If the peeled apple in kept in the refrigerator, the oxidation reaction is greatly slowed down. This is because, rate of chemical reaction decreases with temperature. Hence, in refrigerator it would take several days for it to turn brown.

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Can a molecule with nonpolar bonds ever be polar? Why<br> why not?
Tanya [424]

Answer:

A molecule that has only nonpolar bonds and no polar bonds cannot be polar.

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Which statement describes compounds?
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