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tangare [24]
3 years ago
14

What phase(s) of matter are the elements in Main Group 8?

Chemistry
1 answer:
DanielleElmas [232]3 years ago
6 0

Answer:

Solids.

Explanation:

Group 8 on the Periodic Table consists of transition metals:

- Fe (Iron)

- Ru (Ruthenium)

- Os (Osmium)

- Hs (Hassium)

Usually, transition metals are solids.

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Atoms and molecules are constantly in motion. The more energy the atom or molecule contains, the faster they move about. In whic
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Answer:

Solid

Explanation:

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2 years ago
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
Question 4 of 15
Anna [14]

Answer:

B.

Explanation:

5 0
3 years ago
Read 2 more answers
Why might increasing the temperature alter the rate of a chemical reaction?
azamat

Answer:

Because after increasing of temperature kinetic energy of molecules increases and reaction speed increases in forward or reverse direction.

Explanation:

3 0
3 years ago
Someone plz help me
marshall27 [118]

Answer:

B. 120 cm

Explanation:

The scale is 1 to 15, so when we are given the value of 8cm all you have to do it multiply 8 by 15 which leaves you with 120.

hope this helps!

7 0
3 years ago
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