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3 years ago

Since all atoms have negatively charged electrons, shouldn't every sample of matter have a negative charge? Explain.

Chemistry

1 answer:

expeople1 [14]3 years ago

6 0

Answer is: no, every sample does not have a negative charge.

Beside negatively charged electrons, atoms have positively charged protons, so atoms have neutral charge.

Atomic number is the number of protons, which is characteristic of a chemical element. For example, iron (Fe) is an element with atomic number 26, which means it has 26 protons and 26 electrons (in neutral atom, number of protons is equal to number of electrons).

The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.

Proton is a subatomic particle with a positive electric charge of +1e elementary charge.

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A compound that is composed of only carbon and hydrogen contains 80.0% c and 20.0% h by mass. What is the empirical formula of t

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<u>Solution</u> : Emperical Formula = $CH_{3}$

Emperical Formula - A formula that gives the simplest whole number ratio of atom in a compound.

In the question percentages are given then assume that the total mass is 100grams so that the mass of each element is equal to the percentage given.

Given : 80.0g Carbon

20.0g Hydrogen

First convert the given masses into moles.

$80.0g\text{ C} \times \frac{1 g/mole \text{ C}}{12.0 g/mole \text{ C}}= 6.66\text{mole of C}$

$20.0g\text{ H} \times \frac{1 g/mole \text{ H}}{1 g/mole \text{ H}}= 20.0\text{mole of H}$

Value of each mole divided by the smallest number of moles and then round off.

Moles ratio of the element are

$\frac{6.66}{6.66}\text{mole of C}= 1$

$\frac{20.0}{6.66}\text{mole of C}= 3$

This is the mole ratio of the elements and is repersented by the subscript in the emperical formula.

Emperical Formula = $CH_{3}$

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For the compound B the following statement is correct-

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On the other hand although there presence a -O- functional group in ether. It is less soluble in water due to non polarity of the functional group.

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B. It is an ether because it is unable to form a hydrogen bond, so it is less soluble in water.

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