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3 years ago

Can someone help me ;) Will be marking someone brainliest ! Thank you...<3

Chemistry

1 answer:

chubhunter [2.5K]3 years ago

6 0

1. The name of this element is Carbon because there are 6 electrons in the shell.

2. Sorry I didn't learn that. And I don't know.

1. A metal is a solid substance, usually hard. On the other hand, a non-metals is a solid or gaseous material, in which the metallic properties are absent.

2. When a new substance is formed at that time we can understand that chemical reaction has taken place. It can't be reversed.

4. Neutron = no charge

Electron = negative

Proton= positive

5. Nucleus has a positive charge.

6. An atom is bigger. Because electrons are what takes up space in atoms, the result is that the size of the biggest filled orbital determines the size of the atom or ion.

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What does Reproducibility mean? Plz help me

joja [24]

Answer:

the ability to be reproduced or copied.

Explanation:

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3 years ago

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The atomic mass of an element is the sum of neutrons and A) atoms. B) electrons. C) isotopes. D) protons.

Elis [28]

Answer: D) protons.

The other option that would make the most sense would be electrons, however the mass of an electron is so small that is basically negligible, so it's not included in the atomic mass.

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4 years ago

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Sometimes, based on the electron configurations of the elements involved, a possible chemical formula for a compound can be pred

Nadusha1986 [10]

Answer:

D)the first ionization energy (IE1) of B is most probably lower than the first ionization energy (IE1) of A

Explanation:

As mentioned the possible chemical formula for a compound can be predicted from electron configurations of the elements.

The first element 'A' has electronic configuration as "[core]ns²

It means it has two valence electrons and it can give those valence electrons to attain noble gas or full filled stability.

So the element is most likely to form a dipositive ion.

Now for element B the configuration is :[Core]ns²np⁵

thus it has seven valence electrons and it will most likely to accept an electron to gain full filled stability. So B will form a mono negative ion.

The possible formula will be AB₂ [Like MgCl₂]

So the false statements are:

D)the first ionization energy (IE1) of B is most probably lower than the first ionization energy (IE1) of A : the first ionization energy of A will be lower than B as B cannot give an electron easily.

The other statements are correct:

A) element A serves as the reducing agent in the reaction to form AxBy : As A will lose electrons so it will acts as reducing agent and itself gets oxidized

B) yes it is whole number as calculated above.

C) x + y = 1+2 = 3

E) Already calculated that B has oxidation state of -1.

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3 years ago

The molar mass of iron oxide (Fe2O3) is 159.7 g/mol. What is the correct way to write the molar mass of iron oxide as a conversi

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Answer: $\frac{1mol}{159.7g}$ or $\frac{159.7g}{1mol}$

Explanation: Given molar mass of Iron(III)oxide is 159.7 g/mol. It means the mass of 1 mol of Iron(III)oxide is 159.7 g.

How to write the molar mass as a conversion factor is all depends if we are calculating the moles or grams.

If the grams are given and we are asked to calculate the moles then the conversion factor is written as $\frac{1mol}{159.7g}$ and if the moles are given and we are asked to calculate the grams then the conversion factor is written as $\frac{159.7g}{1mol}$ .

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4 years ago

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Write a balanced equation for the combustion of isooctane,C8 H16 a component of gasoline.

algol13

Answer: The balanced chemical equation for the combustion of isooctane is written below.

Explanation:

Combustion reactions are defined as the reactions in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water. Heat is released during these reactions.

A balanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on product side.

The balanced chemical equation for the combustion of isooctane follows:

$C_8H_{16}+12O_2\rightarrow 8CO_2+8H_2O$

By Stoichiometry of the reaction:

1 mole of isooctane reacts with 12 moles of oxygen gas to produce 8 moles of carbon dioxide and 8 moles of water molecule.

Hence, the balanced chemical equation for the combustion of isooctane is written above.

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3 years ago