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Inga [223]
3 years ago
9

Send help thank u asap

Chemistry
2 answers:
olga55 [171]3 years ago
7 0

Answer:

3 is B 4 is the number 3

Explanation:

I hope this helps :D

xenn [34]3 years ago
6 0

Answer:

The Answer is ________ Please Make sure You Put it In and Trust Have a wonderful day/Night:)

Explanation:

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When a strong acid is titrated with a strong base using phenolphthalein, the color changes suddenly at the end point. The color
larisa86 [58]

Answer:

Keto - enol tautomerism

Explanation:

Phenolphthalein is an organic molecule (formula: C20H14O4), which is used in to determine the final volume in an acid-base titration, this is, as the molecule changes from one to another color, depending on the Ph of the solution (in acids solution, the molecule remains colorless, while in basics solutions it remains pink)  :

The molecule of phenolphthalein is a week acid, which losses a proton (H+) when it´s in solution: the undissociated molecule is colorless, while the correspondent anion (without a H+) is pink. This may be simplified with the following reaction:

H₃In⁺ ⇄ H₂In (colorless) ⇄ In⁻² (pink) ⇄ In(OH) ⁻³

- When adding a base (for example, NaOH) to phenolphthalein (initially, a colorless solution), molecule losses one H⁺ and we obtain In⁻², which is pink

- When adding an acid, the original structured is recovered, so color turns from pink to colorless

This change color is not only explained with adding an acid or a base, but also with phenolphthalein structure, that leads to a keto-enol tautomerism: as molecule has 2 hydroxyl groups (- OH) and 1 carbonyl group (C = O), compounds with this structure have an equilibrium between both groups:

R1 = C H– OH ⇄  R1 – C = O

With this change, phenolphthalein structure changes and hence, color solution changes as well

4 0
3 years ago
Help me with 6 plzzz is it a b c or d??
Lelu [443]
The answer is C, good luck mate
3 0
3 years ago
Read 2 more answers
Doing it again please answer for me appreciate it thank you
Mandarinka [93]

Answer:

1. A

Explanation:

i guessed on this answer

4 0
3 years ago
Read 2 more answers
An arrow is fired at a target on a high wall. Which statement correctly describes the change in the energy of the arrow as it mo
grigory [225]

Answer : Option C) The kinetic energy decreases as potential energy increases.

Explanation : As the target is fired high on the wall, the change in the energy that is observed as the arrow moves towards the target is kinetic energy starts to decrease as the arrow reaches nearer towards the target and the potential energy is observed to increase. So, in short the energy transformation is from kinetic energy from a moving arrow to potential energy when the arrow hits the target.

8 0
3 years ago
Read 2 more answers
What is δg for the formation of solid uranium hexafluoride from uranium and fluorine at 25∘c when the partial pressure of f2 is
Sladkaya [172]

The reaction is

U(s)+3F_{2} (g)-->UF_{6} (s)

the Q of reaction will be

Q = \frac{1}{(pF_{2})^{3}}

Q = \frac{1}{(0.054)^{3}  } = 6350.66

ΔG=ΔG^{0}+RTlnQ

Putting values

ΔG = -2068000 + (8.314)(298)lnQ

ΔG = -2068000 + (8.314)(298)ln(6350.66) = -2046305 J /mol = -2046.3 kJ / mol



3 0
3 years ago
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