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4 years ago

Which of the following is a mixture?

Chemistry

2 answers:

Alexxx [7]4 years ago

7 0

Answer: Option (a) is the correct answer.

Explanation:

A substance in which two or more elements are mixed together but these substances do not combine chemically to each other is known as a mixture.

For example, salt in water is a mixture as salt completely dissolves in water.

Whereas in carbon dioxide, carbon atom reacts chemically with oxygen atom. So, it is not a mixture.

Similarly, water vapor and oxygen gas are both compounds as they contain atoms which are present in similar composition.

Thus, we can conclude that out of the given options salt water is a mixture.

Damm [24]4 years ago

6 0

Answer: Salt Water

Explanation: The combination of two different substances which are not chemically identical is known as the mixture.

Mixture are of two types - homogeneous mixture and Heterogeneous mixture.

Homogeneous Mixture are the those in which which the substances are mixed well with each other so that only one phase appears like salt in water.

Heterogeneous Mixture are those in which two separate phases occur like oil in water.

Thus carbon dioxide, water vapor and oxygen gas are not mixture as carbon reacts with oxygen chemically to form CO2 . Similarly hydrogen gas and oxygen gas combines chemically to form water vapor. Oxygen is the diatomic elemental gas.

Moreover no chemical reaction takes place between the subsatnces when mixture is formed.

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Be sure to answer all parts. What is the [H3O+] and the pH of a buffer that consists of 0.26 M HNO2 and 0.89 M KNO2? (K, of HNO2

Aleksandr-060686 [28]

Answer : The $H_3O^+$ ion concentration is, $1.12\times 10^{-3}M$ and the pH of a buffer is, 2.95

Explanation : Given,

$K_a=7.1\times 10^{-4}$

Concentration of $HNO_2$ (weak acid)= 0.26 M

Concentration of $KNO_2$ (conjugate base or salt)= 0.89 M

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (7.1\times 10^{-4})$

$pK_a=4-\log (7.1)$

$pK_a=3.15$

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[KNO_2]}{[HNO_2]}$

Now put all the given values in this expression, we get:

$pH=3.15+\log (\frac{0.89}{0.26})$

$pH=2.95$

The pH of a buffer is, 2.95

Now we have to calculate the $H_3O^+$ ion concentration.

$pH=-\log [H_3O^+]$

$2.95=-\log [H_3O^+]$

$[H_3O^+]=1.12\times 10^{-3}M$

The $H_3O^+$ ion concentration is, $1.12\times 10^{-3}M$

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3 years ago

The amplitude of a wave is the distance between a point on one wave and the identical point on the next wave T or F?

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Sometimes described as a "chemical brother" of gaba (gamma-aminobutyric acid), which amino acid neurotransmitter acts in an exci

poizon [28]

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The possible EAAs are Glutamate (Glu) and Aspartate which act as excitatory neurotransmitters in the brain. They get released from neurons where they induce excitation via metabotropic Glu receptors.

Both glutamate and aspartate having excitatory effect on neurotransmission whereas Gama-amino butyric acid having inhibitory effect on neurotransmission.

Thus, the statement ‘neurotransmitters are chemical brother of gaba’ is indicating the complementary effect of each other.

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3 years ago

In an ecosystem, what do organisms and populations with similar needs compete<br>over?

hram777 [196]

Answer:

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4 years ago

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dexar [7]

Answer:

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3 years ago