How are elements and compounds different?

Chemistry

1 answer:

Black_prince [1.1K]3 years ago

7 0

Answer:

A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom.

Explanation:

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HNO3 Express your answers as ions separated by a comma.

erastovalidia [21]

In this item, it is assumed that we are to express the given compound in their ionic form. To be able to determine as to what ions this compound will dissociate into, we have the chemical reaction.

HNO3 --> H⁺ + NO₃⁻

Hence, the ions are H⁺, NO₃⁻.

4 0

3 years ago

Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possibl

olya-2409 [2.1K]

Answer:

Following are the response to the given question:

Explanation:

The number of shells

n = 4

Calculating the spectral line:

$= \frac{n(n-1)}{2}\\\\ = \frac{4(4-1)}{2} \\\\= \frac{4\times 3}{2}\\\\ = \frac{12}{2}\\\\ = 6$

4 0

3 years ago

The solubility of an ionic compound can be expressed as the number of moles of the compound that will dissolve per liter of solu

Law Incorporation [45]

Answer:

Number of moles of sodium dissolved = 6.0 *10^23

Explanation:

The image for the question is attached

Solution

a) Total 181 ions of Na are dissolved

The number of moles of sodium dissolved = 181/6.023 *10^23

Number of moles of sodium dissolved = 5.987 * 10^23

Number of moles of sodium dissolved = 6.0 *10^23

5 0

3 years ago

Determine the oxidation states of the elements in the compounds listed. None of the oxygen-containing compounds are peroxides or

natka813 [3]

Answer:

Explanation:

You need to remember that the oxidation number of H is +1, except when it is in a metal hydrites like NaH, where its oxidation number is -1. Then, the oxidation number of O is -2, but in peroxides is -1. So with these rules you just have to multiply the ox. number with the name of atoms and all the elements in the reaction must sum 0.