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12345 [234]
3 years ago
9

A solution is known to contain either Ni2 or Cr3 . Addition of what single (1 only) reagent would identify which ion is present?

Chemistry
1 answer:
galina1969 [7]3 years ago
6 0

Answer:

Explanation:

From the periodic table; both elements given are from the same group 3.

To test for which ion will be present in the experiment;

We added 6M aqueous sodium hydroxide  in excess.

This process is followed by the addition of hydrogen peroxide H2O2 while stirring.

Heat is then applied to the solution.

After we've carried out those process;

We will notice the following;

IfNi^{2+} is present, then a green NI(OH)_2  precipitate will be formed

If Cr^{3+} is present,then a yellow-colored CrO^{2-}_{4} will be formed.

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A plasma membrane and a cell wall _____.
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<h3><u>Answer;</u></h3>

<em>D. Have different structures and different functions</em>

A plasma membrane and a cell wall <em><u>have different structures and different functions</u></em>.

<h3><u>Explanation;</u></h3>
  • <em><u>Plasma membrane</u></em> is a structure that is found in <u><em>both animal cell and plants cells</em></u>. It is made up of a <u><em>bi-layer consisting of lipid and proteins</em></u>. Plasma membrane are semi-permeable which means the<em><u> allow selective movement of materials in and out of the cell. </u></em>
  • <em><u>Cell wall</u></em>, on the other hand is a structure that is found on plant cells and lacks in animal cell. It <em><u>contains cellulose in its structure </u></em>which enables it to be rigid and enhances it <em><u>protect the cell from mechanical damage</u></em> from harsh conditions such as pressure in the outside environment.

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3 years ago
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What is plate tectonics
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Al colocar unos trocitos de zinc en un tubo de ensayo, agregamos 2 mL de acido clorhídrico. El Zinc sustituye el hidrogeno del a
Rudik [331]

Answer:

DICLORURO DE ZINC

Explanation:

La ecuación es:

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El zinc reacciona en una reacción redox con el acido clorhídrico para formar una sal y liberar el hidrogeno gaseoso.

Se trata de una reacción redox porque el hidrógeno se reduce (disminuye el numero de oxidación, de -1 a 0, en su estado fundamental), mientras que el Zn se oxida (el numero de oxidación aumenta de 0 a +2).

Como la sal se forma con dos atomos de cloro, se denomina dicloruro por lo que el nombre correcto de la sal en nomenclatura sistemática es:

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3 years ago
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When an atom of lithium loses an electron and becomes an ion, it has one less electron shell, so its radius is smaller than the radius of the atom.
The answer is 3.
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