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Dvinal [7]
4 years ago
11

How to find the mass number of an atom with 45 neutrons and 35 electrons?

Chemistry
1 answer:
Nata [24]4 years ago
5 0
Mass number = protons + neutrons
protons = electrons
so 35 electrons = 35 protons 

So 35 protons + 45 neutrons =
80

The element is Bromine with the symbol: Br

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Compared to an electron, which particle has a charge that is equal in magnitude but opposite in sign?
Sindrei [870]
I think the correct answer is proton since protons have a charge of +1 while electrons have a charge of -1.  However, since beta particles are used to name a type of nuclear decay and can refer to either a positron or electron depending on the circumstances, your teacher might want you to put beta particle since positrons are basically electrons but that have a positive charge.
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8 0
3 years ago
If 0.756L of gas exerts a pressure of 94.6kPa, what would the volume be at standard pressure (101.33kPa)?
yaroslaw [1]

Answer:

The answer to your question is Volume = 0.7 l

Explanation:

Data

Volume 1 = V1 = 0.746 l

Pressure 1 = P1 = 94.6 kPa

Volume 2 = V2 = ?

Pressure 2 = 101.33 kPa

Process

To solve this process use Boyle's law.

           P1V1 = P2V2

-Solve for V2

           V2 = P1V1/P2

-Substitution

          V2 = (94.6 x 0.746) / 101.33

-Simplification

           V2 = 70.57 / 101.33

-Result

            V2 = 0.696 l ≈ 0.7 l

4 0
4 years ago
When making a solution of sodium hydroxide and water, a student weighed out an certain amount of sodium hydroxide pellets and di
Mariulka [41]

Hygroscopic nature of NaOH is the main reason for the lower concentration of the sodium hydroxide in the solution.

<u>Explanation:</u>

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  • When the NaOH crystals are weighed, the crystals absorb moisture from the surroundings, and so the weight of the crystals may change, so the concentration of the solution was lower than the required one.So it is not possible to prepare NaOH solution under normal room temperature.
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3 years ago
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Answer:

Un río aluvial es aquel en el que el lecho y las riberas están formados por sedimentos móviles y / o suelo.

Explanation:

3 0
3 years ago
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