What is represented by the dots in a Lewis electron-dot diagram ofan atom of an element in Period 2 of the Periodic Table?(1) the number of neutrons in the atom(2) the number of protons in the atom(3) the number of valence electrons in the atom(4) the total number of electrons in the atom

Answers

Answer 1

Answer: The number of Valence electrons are shown so that one can clearly see the electron transfer or sharing that may take place between the atoms.

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Which of the following molecules contains a covalent bond? (Use the electronegativity values from the periodic table link to help you answer this question.)A. HF
B. LiCl
C. CN-
D. MgO.)

Answers

If the electronegativity difference is less than 1.6 or when the difference is 1.6 - 2.0 and it only involves nonmetal, then the molecule contains a covalent bond.
A. HF: 4.0 - 2.1 = 1.9 (Covalent)
B. LiCl: 3.16 - 0.96 = 2.2 (Non-covalent)
C. CN-: 3.04 - 2.65 = 0.39 (Covalent)
D. MgO: 3.44 - 1.31 = 2.13 (Non-covalent)

Answer:

C APEX APPROVED

Explanation:

The combining of atoms together is known as nuclear

Answers

The correct word to fill the statement is fusion. The combining of atoms together is known as nuclear fusion. This reaction happens where two or more nuclei of an atom comes very close at a very high speed and joins to form a new nucleus.

Find the oxidation number of each sulfur in the molecule H2S4, which has a linear arrangement of its atoms.

Answers

In the molecule H2S4, each sulfur atom has an oxidation number of -2.

Compare Dobereiner’s triads to the modern periodic table. What aspects of his idea agreed with the modern table and what aspects did not

Answers

The aspects of Dobereiner’s triads that agreed with the modern table where elements were arranged together with similar properties, and the aspects that did not match were the periodic table arranged in the rising of their atomic number.

What were Dobereiner’s triads?

Dobereiner’s triads were the arrangement of chemical elements on the basis of their similar physical and chemical properties, this was called the old periodic table. It was given by German chemist Johan Wolfgang Dobereiner.

The modern periodic table is arranged on the basis of their atomic number The elements of Dobereiner's triads were placed based on the order of increasing atomic masses.

Thus, All known elements could not be grouped into triad groups based on their properties.

To learn more about Dobereiner’s triads, refer to the below link:

brainly.com/question/17984569

#SPJ2

Answer:

In Dobereiner’s triads, elements were placed :

According to increasing order of their atomic masses.
Into groups which have similar chemical and physical properties.
In each group there were three elements.

In Modern periodic table, elements are placed:

According to increasing order of their atomic numbers.
Into groups and these groups are assigned according to the numbers of valence electrons present in their valence shell.

Aspects of Dobereiner’s triads agreed with the modern periodic table

Element of the same group will have similar chemical and physical properties.

Disagreement with the modern periodic table.

Not all groups obeyed law of triads.
On the basis of properties all known elements could not be classified into groups of triads.

How many gram of nitrogen are needed to produce 325 gram of ammonia? n2(g) + 3h2(g) → 2nh3(g)

Answers

Answer : The mass of nitrogen needed are, 267.68 grams

Explanation :

Mass of $NH_3$ = 325 g

Molar mass of $NH_3$ = 17 g/mole

Molar mass of $N_2$ = 28 g/mole

First we have to calculate the moles of $NH_3$ .

$\text{Moles of }NH_3=\frac{\text{Mass of }NH_3}{\text{Molar mass of }NH_3}=(325g)/(17g/mole)=19.12moles$

Now we have to calculate the moles of $N_2$ .

The balanced chemical reaction is,

$N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$

From the balanced reaction we conclude that

As, 2 moles of $NH_3$ obtained from 1 mole of $N_2$

So, 19.12 moles of $NH_3$ obtained from $(19.12)/(2)=9.56$ moles of $N_2$

Now we have to calculate the mass of $N_2$ .

$\text{Mass of }N_2=\text{Moles of }N_2* \text{Molar mass of }N_2$

$\text{Mass of }N_2=(9.56mole)* (28g/mole)=267.68g$

Therefore, the mass of nitrogen needed are, 267.68 grams

Molar mass :

N₂ = 28.0 g/mol
NH₃ = 17.0 g/mol

N₂(g) + 3 H₂(g) = 2 NH₃(g)

28.0 g (N₂)---------> 2 x 17 g NH₃
? g ------------> 325 g NH₃

Mass N₂ = ( 325 x 28.0 ) / ( 2 x 17 )

Mass N₂ = 9100 / 34

= 267.64 g of N₂

hope this helps!

What evidence of a chemical reaction might you see dropping an alka seltzer

Answers

Bubbling if you put it in a liquid

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