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weqwewe [10]
3 years ago
11

Explain how the periodic table is arranged and why it is a helpful tool in our study of chemistry. Write in complete sentences a

nd use at least 4 sentences to complete your paragraph.
Please do not answer this unless you have a complete answer. I don't want point hoggers, I want people who know what they are talking about.
Chemistry
1 answer:
frosja888 [35]3 years ago
3 0
The periodic table is grouped by the properties of each element. They are also arranged in the order of their atomic mass.  Different rows of elements are called periods. If elements lie in the same column, they are in the same group. It is helpful to us today because it helps us gain new information on the properties and the world around us. We would not have a true understanding of Chemistry if it were not for the period table.

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Nitrogen gas has the chemical formula N2. One molecule of nitrogen gas is made up of
Vedmedyk [2.9K]

Nitrogen gas has the chemical formula N2. One molecule of nitrogen gas is made up of two atoms of nitrogen.

The correct option is C.

Explanation:

Nitrogen gas has the chemical formula N_{2}, which means that two atoms of nitrogen element combined to form nitrogen gas.

The combination of two atoms of element nitrogen produce dinitrogen atom.

Dinitrogen is the nitrogen gas usually present in atmosphere of the earth in abundance.

2 atoms of nitrogen element

N + N = N_{2}

the gas is colorless and odorless formed at standard condition of temperature and pressure. The two nitrogen atoms are tightly bonded with triple bonds in between the atoms.

6 0
4 years ago
Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?
wlad13 [49]

if I'm not mistaking it would be the second option

6 0
3 years ago
Why do some elements that are classified as metals not look metallic?
Shkiper50 [21]

Answer:

So, that students like us get confuse!!!

Explanation:

6 0
3 years ago
Which atom has a change of oxidation number of +4 in the pictured redox reaction?
SpyIntel [72]

Answer:

The answer to your question is the letter d. S

Explanation:

Data

Change of +4 in the oxidation number

Chemical reaction

               K₂Cr₂O₇  +  H₂O  +  S  ⇒   KOH  +  Cr₂O₃  +  SO₂    

Process

1.- Calculate the oxidation numbers following the rules.

Some rules

  H = +1       O = -2    Alkali metals = + 1    Alkali earth metals = +2    

K₂⁺¹Cr₂⁺⁶O₇⁻²  +  H₂⁺¹O⁻²  +  S⁰  ⇒   K⁺¹O⁻²H⁺¹  +  Cr₂⁺³O₃⁻²  +  S⁺⁴O₂⁻²    

Elements that changed their oxidation numbers

                       Cr₂⁺⁶   ---------------- Cr₂⁺³

                       S⁰       --------------- S⁺⁴

                     

 

3 0
3 years ago
For the formula C4H9Cl , calculate the index of hydrogen deficiency (IHD) and select all the types of unsaturation that might be
pogonyaev

Answer:

IHD = 0; no unsaturation in the formula

Explanation:

The IHD is also known as the degree of unsaturation formula. This formula is commonly used to get an idea of how many unsaturations a molecule has, and in this way, we can get an approach of the type of compound we are treating. For example, if this number is 1, it means that the compound has at least one unsaturation and it could be a double bond or just cyclical compound.

The IHD is calculated using the following expression:

IHD = (a + 1) - (b + x - c)/2   (1)

Where:

a: number of carbon

b: number of hydrogens

c: humber of nitrogens

x: number of halogens.

Now, we have the formula C₄H₉Cl, let's identify a, b, c and x:

a: 4 carbons;  b = 9 hydrogens;  C = none;   X: 1 chlorine

Replacing in (1) we have:

IHD = (4+1) - (9+1)/2

IHD = 5 - (10/2)

<h2>IHD = 0</h2>

So this number is 0, which means that the molecule does not have any kind of unsaturation (Non double bond, multi bond or cyclical).

Hope this helps

7 0
3 years ago
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