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Setler79 [48]
3 years ago
11

Which elements are not balanced in this equation MgO + 2 LiCl = MgCl2 + Li2O

Chemistry
2 answers:
nikitadnepr [17]3 years ago
8 0
B All elements are balanced
ruslelena [56]3 years ago
6 0
This question is about stoichiometry, the ratio of compounds in a reaction. The most important thing that comes out of physics relating to this is the principle of Conservation of Energy, that is energy cannot be created or destroyed, only transferred from one form to another.

This can mean a lot of different things depending on the context, usually to explain why perpetual motion is inpossible - energy transfers are never 100% efficient and as energy cannot be expressly created, the useful energy in an isolated system must dwindle (if you are interested that is called entropy).

But in a chemistry context, for stable atoms such as these where matter remains matter and energy remains energy, it leads to the principle of Conservation of Mass. That is to say there are as many atoms of each type to start with as there are to finish with.

This is why balancing is so important. You wouldn't react two oxygen atoms together (hypothetically) to form two O2 molecules because that would start with 2 atoms and end with 4. Similarly you wouldn't (excluding nuclear fusion reactions) react two magnesium atoms together to produce a Cl2 molecule because the mass has changed (an Mg has a different mass to a Cl).

Taking note of the number of each type of atom on each side of the equation, we find there is the same number always. This shows the equation is balanced. Conservation of Mass, and by extension Conservation of Energy, is satisfied so the answer is B.
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Fill in the missing mass number and atomic number for each of these particles or types of radiation.
Akimi4 [234]

Answer:

Particle /                          mass number                atomic number

type of radiation

alpha / ⁴₂ He                              4                                     2

beta / e⁰                                     0                                   - 1

gamma / γ                                  0                                     0

neutron / n                                 1                                      0

Explanation:

These are the basic types of <em>radiation</em>: <em>alpha </em>(α)<em>, beta </em>(β)<em>,  gamma </em>(γ), and neutrons (n).

The radiation is emitted by unstable nuclei when undergo radiactive decay or by nuclei that are shooted by other particles.

<u><em /></u>

<em><u>Alpha radiation</u></em><u> (⁴₂ He):</u>

They are nuclei of helium-4 atoms: 2 protons and 2 neutrons.

Hence, the atomic number, which is the number of protons,  of these particles, is 2; and the mass number, which is the sum of protons and neutrons, is 2 + 2 = 4.

The symbol of this radiation is ⁴₂ He, where the superscript to the left of the chemical symbol is the mass number and the subscript to the left of the chemical symbol is the atomic number.

<em><u>Beta</u></em><u> (⁰₋ ₁ e)</u>

These are electrons emiited from an unstable nucleus. The symbols used for this particle are either ⁰₋ ₁β or ⁰₋ ₁e.

The superscript 0 indicates that the relative mass of this particle is practically zero and the subscript -1 tells that the emission of electrons increases the atomic number of the nucleus that emits it.

<em><u>Gamma</u></em><u> (⁰₀γ)</u>

The gamma rays are electromagnetic radiation of high (the highest) energy.

The both superscript and subscript are zero, meaning that this radiation does not change either the mass or atomic numbers of the nucleus.

<em><u>Neutron</u></em><u> (¹₀n):</u>

Neutrons are also emiited from the nucleus and so they may be considered a radiation.

The atomic number of neutrons is 0 (since it does not have protons) and its mass number is 1.

4 0
3 years ago
Read 2 more answers
Here the answers for what is radiation?
Aleonysh [2.5K]
Transferring heat through electromagnetic waves
5 0
3 years ago
Read 2 more answers
Draw a Lewis structure for the following molecules on scratch paper. Then give the number of bonds between the C and N in each.
Yuliya22 [10]

Refer to the attachments

6 0
3 years ago
Which substances have /_\Hf = 0 kJ/mol by definition? Select all that apply.
Dimas [21]
Answer: <span>O₂(g), Br₂(l) Fe(s), He(g)
</span>

Justification:

1) The state variable given, ΔHf°, is <span>the standard enthalpy of formation. By definition it is the change in the enthalpy that accompanies the formation of a mole of compound in the standard state, from its constituent elements in the standard state.
</span>

2) Since the standard state of <span>O₂(g), Br₂(l) Fe(s), He(g) is the very same shown, they do not evolve any heat for its formation. This is, that is the same state of the constituents, and no change is involved.
</span>

<span>That is why, </span><span>ΔHf°, of those elements is 0.
</span>
8 0
3 years ago
Read 2 more answers
From the following isotope notation, detemine the number of protons, neutrons &amp; electrons
Crazy boy [7]

Answer:

so the correct answer would be the 3rd one.

26 proton, 32 neutrons, 26 electrons.

Explanation:

Protons and electrons are the same, which is also the same as the atomic number. in that case that would be 26.

Therefore, proton=electron =26

for neutron, you just have to subtract the mass number to the electron/proton.

n = m - e

n= 58-26

neutron =32.

Hope that helps.

3 0
3 years ago
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