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inna [77]
3 years ago
7

For the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotop

e:
You have a Helium Isotope with 2 neutrons. What is the mass number?

2
4
4.0026
6
Chemistry
1 answer:
mafiozo [28]3 years ago
7 0

Answer:

Option B is correct.

4

Explanation:

We know that an atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example, if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

In given problem we are given with 2 neutrons of helium. We know that the atomic number of He is 2. Thus Mass number of He is,

Number of neutrons + number of proton

2 + 2 = 4

Thus, option B is correct.

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300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percenta
ser-zykov [4K]

The empirical formula of the compound is C₄H₅O₃.

<u>Explanation</u>:

If hydrogen % = 5.98823, the Sum of C+O = 94.01177% or 47.005885% each

The original mass of 300 g is not important

C = 47.005885 / 12.011 = 3.913569

H = 5.98823 / 1.008 = 5.94070  

O = 47.005885 / 15.999 = 2.93805  

Divide by the smallest number:      

C =1.33  

H = 2.022

O = 1

Multiply through by 3

C = 4

H =6

O = 3

The empirical formula of a compound = C₄H₆O₃

Do not be confused by the 300 g. It is totally irrelevant to the question because you are dealing with % amounts. It would only have been of importance if you were given some mass values.

4 0
3 years ago
___NH3+ __H2SO4 → (NH4)2SO4
choli [55]

Answer:

The answer to your question is letter d. Synthesis

Explanation:

a. In a decomposition reaction, one single reactant splits out and forms 2 or more products.

b. In a single replacement reaction, a single atom replaces the cation of a molecule.

c. In a combustion reaction, an organic molecule reacts with oxygen to form carbon dioxide and water.

d. In a synthesis reaction, two reactants or more reactants combine to form one single product.

e. In a double replacement reaction, two molecules interchange cations and anions.

8 0
3 years ago
Imagine that you wanted to make a time capsule in which you would seal important artifacts from your life (pictures, poems, a lo
Elza [17]

Answer:

Argon gas

Explanation:

Between the options given, argon gas is the least reactive. Argon is known as a <em>noble gas</em>, this means that it is located in the group 18 in the periodic table. These gases are known for their low reactivity, under most circumstances.

The <u>electronic configuration</u> of argon helps us see why that is the case: With an atomic number of 18, it has an electronic configuration of 1s² 2s² 2p⁶ 3s² 3p⁶. This means the most external orbital is filled with electrons, meaning that there are not unpaired electrons able to react with other substances.

5 0
3 years ago
A 5.15L balloon has a pressure of 1.35 atm. If compressed to 3.43L,
Semenov [28]

Solution:

Using Ideal Gas law:

 P1 = 1.45 atm

V1 = 5.15 L

P2 = ?

V2 = 3.43 L

Using Ideal Gas Law, PV = nRT:

Now, the number of moles (n) is the same independent of pressure and distance, so let's say that the temperature is stable since there is no details on the issue. As a consequence,

P1V1 = nRT = P2V2

P1V1 = P2V2

Solve for P2 and you're going to get 2.03 atm. It makes sense as you decrease the amount of the gas by compressing it, which implies that you raise the heat.

2) P = 1.5 atm

 T = 301 K

 n = 0.785 moles  

PV = nRT

 V = nRT/P

 R = 0.0821 (L*atm)/(mol * K)

 Therefore,  

 V = (0.785 * 0.0821 * 301)/1.5 = 19.4 L

4 0
2 years ago
At what atom of the pyridine ring will oxidation and reduction reactions take place?a. 2.b. 4.c. 3.d. 1.
bagirrra123 [75]

Answer:

1

Explanation:

Pyridine is a six membered hetrocyclic aromatic compound. Oxidation of the pyridine ring occurs at position-1.

Just like benzene, pyridine is stable towards mild oxidizing agents, however, pyridine is oxidized by peracetic acid to yield pyridine N-oxide.

7 0
3 years ago
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