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polet [3.4K]
3 years ago
14

A process used to gain knowledge through observation and investigation is?

Chemistry
1 answer:
Shkiper50 [21]3 years ago
5 0

Answer:matter

Explanation:

matter

make brain

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An increase in the surface area of reactants in a heterogeneous reaction will result in what?
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It will result in an increase in the rate of rxn
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maksim [4K]

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The effectiveness of a chemical sanitizer can be limited by
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Which statements about the structure of the periodic table are true?
Liono4ka [1.6K]

Answer:

Below are the statements which are true about the structure of the periodic table:

B: The inner transition elements are placed at the bottom of the periodic table for easy viewing.

D: The distribution of electrons in energy levels is responsible for the shape of the periodic table.

Explanation:

Point A:

As we know that in a periodic table there are 7 period s and 18 groups. So, the number of periods is evidently lesser than the number of groups. But the shape of periodic table is regular and rectangular so point A is false.

Point B:

The inner transition elements or -f block elements are put at the bottom for easy viewing. These are the elements that have the valence electrons only  in the f-orbital's. Therefore, they are placed separately at the bottom side of the table so that they can be easily viewed or studied from there. So, point B is true.

Point C:

If we talk about option C, then it is very clear and true that considering a rectangular shape of the periodic table, the groups are vertically arranged and periods are horizontally arranged, therefore it is false.

Point D:

Atoms of all elements have definite electronic distribution in different energy levels like s, p d or f. This is a very prominent feature of periodic tale that elements are divided in specific blocks, s, p, d and f based on their electronic configurations. Therefore, it is true.

Point E:

We also know that no. of metals in a periodic table are more than the no. of non metals like almost 91 out of 118 elements  are metals in periodic table. Therefore, the point E "Nonmetals take up more than half the area of the periodic table." is false.

Hope it helps!

5 0
3 years ago
Which of the following is an electrolyte?. A) potassium chloride. B) glucose. C) water D) mayonnaise.
kenny6666 [7]
Answer A )

Potassium chloride

K+   Cl-

hope this helps!.
8 0
3 years ago
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