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REY [17]
3 years ago
8

What is the mass number of an atom with 5 proton and 7 neutrons

Chemistry
2 answers:
Xelga [282]3 years ago
8 0
So the element is boron, so its mass number is 12.
Nataly [62]3 years ago
8 0
Its boron and the answer is going to be 12
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AleksandrR [38]
18 moles of water are produced in the above reaction.
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3 0
3 years ago
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If 11.9 kJ are used to heat a sample of water the temperature increases from 20.0°C to
Kipish [7]

Answer:

m=4.51g

Explanation:

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In this case, since the energy involved during a heating process is shown below:

Q=mCp\Delta T

Whereas the specific heat of water is 4.184 J/(g°C), we can compute the heated mass of water by the addition of 11.9 kJ (11900 J) of heat as shown below:

m=\frac{Q}{Cp\Delta T}

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7 0
2 years ago
Which statement defines dynamic equilibrium? (5 points)
Shalnov [3]

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1. A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

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3. A state of balance in which the forward reaction continues but reverse reaction stops.

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4 0
3 years ago
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vazorg [7]

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Explanation:

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We will analyze each of the options:

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C. The points must be placed one at a time on each side of the chemical symbol: it is correct, because that is the way to make the point diagram.

D. An atom is chemically stable if all the points are paired: this is correct since this verifies that the point diagram has been done well.

We conclude that the correct answer is the option: B. An element with eight valence electrons is chemically unstable.

Hope this helps.....  Stay safe and have a Merry Christmas!!!!!!!!! :D

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3 years ago
Which statement is true about magnetic poles
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A. all magnets have two poles

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