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3 years ago

_____ are two or more elements that have been chemically combined. mixtures compounds atoms colloids

Chemistry

2 answers:

Anna007 [38]3 years ago

5 0

Answer: Option (b) is the correct answer.

Explanation:

When two or more atoms of different elements are chemically combined together in similar composition then the product formed is known as a compound.

For example, NaCl is an ionic compound.

Mixture is the substance in which two or more different components are mixed together in different composition. Components of a mixture never combine chemically.

For example, mud in water is a mixture.

Atom is defined as a single molecule of an element. For example, Na (sodium) atom.

A colloid is defined as a mixture in which insoluble particles are microscopically dispersed and suspended throughout another substance.

For example, milk is a colloid.

Therefore, we can conclude that compounds are two or more elements that have been chemically combined.

Ulleksa [173]3 years ago

3 0

The answer is compound.

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sp2606 [1]

Answer:

<h2>0.05 moles</h2>

Explanation:

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2 years ago

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2 years ago

The value of ka for nitrous acid (hno2) at 25 ∘c is 4.5×10−4. what is the value of δg at 25 ∘c when [h+] = 5.9×10−2m , [no2-] =

LuckyWell [14K]

To get the value of ΔG we need to get first the value of ΔG°:

when ΔG° = - R*T*㏑K

when R is constant in KJ = 0.00831 KJ

T is the temperature in Kelvin = 25+273 = 298 K

and K is the equilibrium constant = 4.5 x 10^-4

so by substitution:

∴ ΔG° = - 0.00831 * 298 K * ㏑4.5 x 10^-4

= -19 KJ

then, we can now get the value of ΔG when:

ΔG = ΔG° - RT*㏑[HNO2]/[H+][NO2]

when ΔG° = -19 KJ

and R is constant in KJ = 0.00831

and T is the temperature in Kelvin = 298 K

and [HNO2] = 0.21 m & [H+] = 5.9 x 10^-2 & [NO2-] = 6.3 x 10^-4 m

so, by substitution:

ΔG = -19 KJ - 0.00831 * 298K* ㏑(0.21/5.9x10^-2*6.3 x10^-4 )

= -40

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2 years ago