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Strike441 [17]
4 years ago
11

Help plzzzzzzz ASAP!

Chemistry
2 answers:
Agata [3.3K]4 years ago
8 0
I am going to say C. it has to do with the angles
kaheart [24]4 years ago
3 0
The index of refraction is the speed of light in a material so the answer is c

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SI unit of frequency is Hertz(Hz)
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Give the location of the elements found in the periodic table which have the same valence electrons. all members in group VIII o
Gekata [30.6K]

Valence is the same in every family... except for transition metals, it goes from 1-8

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7 0
3 years ago
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There are three ways in which to define acids and bases: the Arrhenius concept, the Brønsted-Lowry concept, and the Lewis concep
OleMash [197]

Answer:

(a) KOH acts as base.

H_2SO_4 acts as acid.

(b) NH_3 acts as base.

HCl acts as acid.

Explanation:

Arrhenius theory:-

The Arrhenius theory was introduced introduced by Swedish scientist named Svante Arrhenius in 1887.

According to the theory, acids are the substances which dissociate in the aqueous medium to produce electrically charged atoms ( may be molecule). Out of these species furnished, one must be a proton or the hydrogen ion, H^+.

Base are the substances which dissociate in the aqueous medium to produce electrically charged atoms ( may be molecule). Out of these species furnished, one must be a hydroxide ion, OH^-.

Thus, according to the reaction:-

(a)

2KOH_{(aq)}+H_2SO_4_{(aq)}\rightarrow K_2SO_4_{(aq)}+2H_2O_{(l)}

KOH dissociates as:-

KOH\rightarrow K^++OH^- and hence, acts as base.

H_2SO_4 dissociates as:-

H_2SO_4\rightarrow 2H^++SO_4^{2-} and hence, acts as acid.

(b)

NH_3_{(g)}+HCl_{(g)}\rightarrow NH_4Cl_{(s)}

NH_3 dissociates as:-

NH_3+H_2O\rightarrow NH_4^++OH^- and hence, acts as base.

HCl dissociates as:-

HCl\rightarrow H^++Cl^{-} and hence, acts as acid.

7 0
3 years ago
Assertion: Metals like Na, K, Ca, Mg are never found in their free state in nature.
UkoKoshka [18]

Answer:

A) Both Assertion and Reason are correct and reason is the correct explanation of assertion.

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7 0
3 years ago
List the colors of light in the visible spectrum in order<br> of increasing frequency.
masya89 [10]

Answer:

Violet 400 - 420 nm

Indigo 420 - 440 nm

Blue 440 - 490 nm

Green 490 - 570 nm

Yellow 570 - 585 nm

Orange 585 - 620 nm

Red 620 - 780 nm

Explanation:

5 0
3 years ago
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