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svet-max [94.6K]
3 years ago
5

What are the three major categories used to classify elements?

Chemistry
2 answers:
m_a_m_a [10]3 years ago
5 0
It’s either B. Because element are made up of Protons,neutrons, and electrons or D. Because that’s the categories the elements go in based on what they are.

Hope this helped you!
pentagon [3]3 years ago
3 0

Answer:

i think <em>option no. </em><em><u>"</u></em><em><u> </u></em><em><u>D</u> </em><em>"</em><em> </em><em>= </em><em><u>"</u></em><em><u> </u></em><em><u>metals, non-metals, metalloids</u></em><em><u> </u></em><em><u>"</u></em> is the correct answer.

hope this answer will help u.

have a great time

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Which of the following is NOT a characteristic of stars? A) Size B) temperature C) texture D) color
Lynna [10]

Answer:

C

Explanation:

Characteristics used to classify stars include color, temperature, size, composition, and brightness.

7 0
3 years ago
Which one of the following Acids is most likely to hurt you? Acid A: 1.0 M; Acid B: 0.0001M
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What is the chemical name for the compound with the formula Na2S?
Marina86 [1]
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3 0
3 years ago
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n200080 [17]

Answer:

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6 0
3 years ago
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When potassium metal is placed in water a large amount of energy is released as potassium hydroxide and hydrogen gas are produce
Ann [662]

Explanation:

2K(s)+2H_2O\rightarrow 2KOH(aq)+H_2(g)

The given reaction is redox reaction but not combustion reaction.

Redox reaction : It is a chemical reaction in which oxidation and reduction occurs simultaneously.Oxidation is gaining of electrons and reduction is loosing of electrons.

K\rightarrow K^++e^- oxidation

2H^++2e^-\rightarrow H_2 reduction

Potassium when reacts with water ,gives potassium ion in aqueous medium and combines with hydroxide ion present in water to form potassium hydroxide where as H^+ ions of water by gaining electrons (from potassium in water) gives hydrogen gas.

Hence , yes it is a redox reaction

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Here in given reaction no oxygen molecule is appearing on reactant side.

Hence not a combustion reaction.

6 0
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