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tekilochka [14]
2 years ago
11

Carbon exists in nature as three isotopes. Given the atomic masses and relative abundance of the isotopes, what is the average a

tomic mass of carbon? A. 12. 000 amu B. 12. 011 amu C. 13. 002 amu D. 13. 003 amu E. 14. 003 amu.
Chemistry
1 answer:
Shtirlitz [24]2 years ago
3 0

Answer:

B. 12. 011 amu

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How many lone pairs does CO2 have? Does it have Single bonds or Double bonds? Does it obey the octet rule?
Aleks04 [339]
The molecule CO2 have 2 lone pairs located in the oxygen atoms. It has two double bonds also connecting carbon atom to the two oxygen atoms. It does obey the octet rule so the atoms need 8 electrons in each of them that is why electrons are shared.
3 0
3 years ago
Which term is defined as the sum of protons and neutrons in an atom?.
nata0808 [166]

Answer:

mass number

Explanation:

yeah mass number is the total of protons and neutrons

for example carbon has 12 proton and 12 neutrons therefore it's mass number is 24

i hope this is what you're looking for

5 0
2 years ago
You break a pencil lead. Which statement is true?
aalyn [17]

Answer:

  • <em><u>A physical change has occurred, with no energy change.</u></em>

Explanation:

When a pencil lead is broken there is not change of any chemical properties, therefore it is not a chemical change, but just a physical change. In this case the change is just the number of pieces and dimensions.

Chemical changes always involve the formation of new different substances; the bonds between the atoms of the starting substances (reactants) breake and new bonds are formed leading to new substances (products) with different chemical composition (arrange of atoms). Chemical changes occur through chemical reactions.

Hence, if there is not change on the chemical composition, you think on physical changes. Physical changes include change in shape, size, state of matter (e.g. solid, liquid, gas). In the case of a pencil lead breaking, it is a change in shape and size.

Also, since energy has not been absorbed or released during the change, the energy of the pencil lead before having been broken is equal to the sum of the energies of the pieces of pencil lead obtained. So, this is a physical change with no energy changes.

Some examples of physical changes that include change in energy are the change of state (e.g. solid to liquid or liquid to gas) and the dissolution of a compound.

7 0
3 years ago
In the reaction H2CO3 (aq) + 2NH3 (aq) = 2NH4^+ (aq) + CO3 2- (aq), how many electrons are transferred?
aalyn [17]

The electrons are transferred when the reaction is redox reaction. It means that there must be reduction and oxidation.

The given equation is

H_{2}CO_{3} (aq)+2NH_{3} (aq)=2NH_{4}^{+}(aq)+CO_{3}^{-2}(aq)

The oxidation number of each element remains the same before and after the reaction.

H = +1

C: +4

O: -2

N: -3

Thus this is simple acid base reaction and not redox

There is transfer of proton from bicarbonate to ammonia

this is not a redox reaction


3 0
3 years ago
Find the time Δt it takes the magnetic field to drop to zero. Express your answer in terms of some or all of the quantities a, B
Mekhanik [1.2K]
Δt= \frac{NB_0 \pi a^2 }{IR}

This because ε = dΦ/dt, and emf is a voltage so it can also be written as dΦ/dt = IR

Because ΔΦ= ABcosθ for each of the N loops and cosθ is just 1 here only A needs to be replaced, and it can be replaced with A=πr^2, which makes that part of the equation ΔΦ_m=N*B0*πa^2
7 0
3 years ago
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