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3 years ago

Which of the following is an endothermic reaction

Chemistry

2 answers:

OLga [1]3 years ago

8 0

D is your answer. :)

pashok25 [27]3 years ago

7 0

The answer is D an explosion

An endothermic reaction is a chemical that is caused by heat and light.

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Arbon dioxide is dissolved in blood (ph 7.5) to form a mixture of carbonic acid and bicarbonate. Part a neglecting free co2, wha

Aleks04 [339]

Answer : The fraction of carbonic acid present in the blood is 5.95%

Explanation :

The mixture consists of carbonic acid ( H₂CO₃) and bicarbonate ion ( HCO₃⁻). This represents a mixture of weak acid and its conjugate which is a buffer.

The pH of a buffer is calculated using Henderson equation which is given below.

$pH = pKa + log \frac{[Base]}{[Acid]}$

We have been given,

pH = 7.5

pKa of carbonic acid = 6.3

Let us plug in the values in Henderson equation to find the ratio Base/Acid.

$7.5 = 6.3 + log \frac{[base]}{[acid]}$

$1.2 = log \frac{[base]}{[acid]}$

$\frac{[Base]}{[Acid]} = 10^{1.2}$

$\frac{[Base]}{[Acid]} = 15.8$

$[Base] = 15.8 \times [Acid]$

The total of mole fraction of acid and base is 1. Therefore we have,

$[Acid] + [Base] = 1$

But Base = 15.8 x [Acid]. Let us plug in this value in above equation.

$[Acid] + 15.8 \times [Acid] = 1$

$16.8 [Acid] = 1$

$[Acid] = \frac{1}{16.8}$

$[Acid] = 0.0595$

[Acid] = 0.0595 x 100 = 5.95 %

The fraction of carbonic acid present in the blood is 5.95%

4 0

4 years ago

Read 2 more answers

What are the best topics to write a project work on EVS and Chemistry

professor190 [17]

Answer:

It is better to do chemistry

Explanation:

So that you will learn more of chemicals

6 0

3 years ago

Lighting a match changes ch and energy into heat.

otez555 [7]

Answer:

The answer remains the same. The total amount of energy stays the same because the 1st Law of Thermodynamics states that energy can neither be created nor destroyed, it can only change forms. So the chemical energy is just being converted into heat and light.

Explanation:

hope this helps...

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3 years ago

Select the correct answer. Which is true according to the law of conservation of energy? A. In a closed system, the total amount

mojhsa [17]

in the image there is answer okk

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3 years ago

(BRAINLIEST) Which of these Indicators will you use to check the pH of coloured Solution?

rjkz [21]

you will use methyl orange to check the pH of a coloured solution

hope it helps

Brainliest?

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3 years ago