CHEMISTRY HIGH SCHOOL

An atom of carbon-12 and an atom of carbon-14 differ in(1) atomic number(2) mass number(3) nuclear charge(4) number of electrons

Answers

Answer 1
Answer:

Answer:

The correct answer is option (2).

Explanation:

Carbon-12:

Atomic Number = 6

Mass number = 12

Nuclear charge =  number of protons = +6

Number of electrons = 6

Carbon-14:

Atomic Number = 6

Mass number = 14

Nuclear charge =  number of protons = +6

Number of electrons = 6

An atom of carbon-12 and an atom of carbon-14 only differ in their mass number as C-12 has mass number of 12 and C-14 has mass number of 14.
Answer 2
Answer: (2) mass number
the number after the two carbons is the mass number, the two carbons are different isotopes of each other
isotopes have the same number of protons but different number of neutrons, neutrons and protons make up the atomic mass number, so if you add neutrons to the atom the mass number increases
i hope that makes sense!

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In a laboratory investigation, magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. This reaction is represented by the unbalanced equation below.Mg(s) + HCl(aq) ==>H2(g) + MgCl2(aq)

State, in terms of the relative activity of elements, why this reaction is spontaneous.

Answers

The reaction depicted by the equation would be spontaneous because Mg is higher in reactivity than H.

Reactivity series of cations

The reactivity series of anions is such that: K, Na, Ca, Mg, Al, Zn, Fe, Sn, Pb, and H.

Ions at the higherposition in the reactivity series are able to displace those in lower positions in chemical reactions. Whereas, those in lower positions cannot displace those in higher positions.

Mg is far higher than H in the reactivity series, and thus, will be able to displace Hfrom HCl without any forceful procedure.

More on the reactivity series can be found here:brainly.com/question/14652325

#SPJ2

Why must water be heated at about 80 degrees during esterification

Answers

The esters need to evaporate to be smelled.

Identify each of the following as either a physical change or a chemical change. Explain your answers.A. a piece of wood is sawed in half.
B. milk turns sour.
C. melted butter solidifies in the refrigerator.

Answers

A. physical
B. Chemical 
C.Physical

Answer:

A would be Physical

B would be Chemical

and C would be Physical

Explanation:

A would be physical because the wood is physically changing

B would be chemical because it's still milk but it now had clumps called curds and a very sour taste

C would be physical because the melted butter is physically changing from melted butter to solid butter.

Hope this helps.

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Answers

its true :)
i take chemistry rn lol

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A. The reaction will stop.
B. The reaction will slow down.
C. The reaction will speed up.

Answers

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What is the first element of the periodic table?

Answers

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I hope this helps;)
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