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3 years ago

Please hurry, 15 minutes left!

2 answers:

7 0

Covalent bonds are formed when 2 neutral atoms come together to share a pair of electrons, where each atom contributes one electron each to be shared.

The covalent bond is kept together by the electrostatic attraction between the nuclei of the atoms and the shared pair of electrons.

Covalent bonds are usually formed between non metals with a small difference in their electro negativity.

the correct answer is

A. Neutral atoms coming together to share electrons

Kazeer [188]3 years ago

3 0

Answer: Covalent bonds are described as the neutral atoms coming together to share electrons.

Explanation:

Covalent bond is defined as the bond which is formed by the sharing of electrons between the atoms forming a compound. These are usually formed when two non-metals react.

For Example: HCl is formed by the combination of hydrogen and chlorine atoms. These atoms share electrons to form the compound.

Ionic bond is defined as the bond which is formed by complete transfer of electrons from one atom to another atom.

The atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom. This bond is usually formed between a metal (carrying positive charge) and a non-metal (carrying negative charge)

For Example: NaCl is formed by the combination of $Na^+\text{ and }Cl^-$ ions

Hence, covalent bonds are described as the neutral atoms coming together to share electrons.

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Write the systematic names of the following

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I think it's aluminium chloride

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3 years ago

Lithium, is used in dry cells and storage batteries and in high temperature lubricants, it has two naturally occurring isotopes,

erastovalidia [21]

Answer: The average atomic mass of lithium is 6.9241 u.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ ....(1)

For $_3^6\textrm{Li}$ isotope:

Mass of $_3^6\textrm{Li}$ isotope = 6 u

Percentage abundance of $_3^6\textrm{Li}$ isotope = 7.59 %

Fractional abundance of $_3^6\textrm{Li}$ isotope = 0.0759

For $_3^7\textrm{Li}$ isotope:

Mass of $_3^7\textrm{Li}$ isotope = 7 u

Percentage abundance of $_3^7\textrm{Li}$ isotope = 92.41%

Fractional abundance of $_3^7\textrm{Li}$ isotope = 0.9241

Putting values in equation 1, we get:

$\text{Average atomic mass of Lithium}=[(6\times 0.0759)+(7\times 0.9241)]$

$\text{Average atomic mass of Lithium}=6.9241u$

Hence, the average atomic mass of lithium is 6.9241 u.

7 0

2 years ago

11) How many moles of CO2 can be produced from 5.0 moles of O2?

Paraphin [41]

Answer:

3.6 moles

Explanation:

5.0moles produce 44g/x will produce 32g the answer is a3.6moles

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2 years ago

What happens during an alpha decay?

Andrej [43]

Answer:

Alpha decay is a type of radioactive disintegration in which unstable atomic nucleus releases a helium nucleus or alpha particle and transform into a different element. The new element formed will be reduced by four and the atomic number will be reduced by two.

Example of alpha decay is: Uranium 238 transform into Thorium 234 with the emission of an alpha particle.

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3 years ago

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Anna71 [15]

Answer:

You can find in the given attachemnet

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2 years ago