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Rudiy27
4 years ago
15

Given an element’s atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?

Chemistry
2 answers:
hram777 [196]4 years ago
8 0
Are there any choices or is that the only part of the question?

Charra [1.4K]4 years ago
4 0

Explanation:

Atomic number is the number of protons present in an atom. Whereas mass number is the sum of total number of protons and neutrons present in an atom.

For example, atomic number of bromine is 35, that is, there are 35 protons present in a bromine atom. The mass number of bromine is 80.

So,     Mass number = no. of protons + no. of neutrons

                 no. of neutrons = mass number - no. of protons

                                            = 80 - 35

                                            = 45

Hence, in a bromine atom there are 35 protons and 45 neutrons.                

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Which atomic model proposed that electrons move in specific orbits around the nucleus of an atom?
kakasveta [241]
The Bohr Model, which was proposed by Niels Bohr in 1913
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3 years ago
Global warming is a theory accepted by a majority of scientists.How can local environmental changes have global effects?
meriva

The local environmental changes are having a global effect, and that is well documented and constantly witnessed. The reason why local environmental changes can have such a big impact is that the gasses move freely throughout all of the planet, they move horizontally with the winds, and they also move vertically higher into the atmosphere which is in constant movement.

This results in a situation where one area produces lot of pollution, but another area is feeling the effects because the air masses moved big portion of the polluters there.

A nice example are China and Mongolia. China is one of the two major polluters in the world, while Mongolia barely has any industry especially when considered its size and population. The air masses though are moving from the southeast towards northwest, thus big portion of the pollution in the eastern part of China goes into Mongolia. Because of this, despite not being a big polluter, Mongolia has one of the worst air qualities in the world.

Also, we can witness that the holes in the ozone layer are mostly around the poles, despite the sources of the chemicals that are damaging it are on totaly different locations.

3 0
3 years ago
Consider the reaction N2(g) + 3H2(g) → 2NH3(g) Suppose that at a particular moment during the reaction, molecular hydrogen is re
rosijanka [135]

Answer:

The solution to the question is as follows

(a) The rate of ammonia formation = 0.061 M/s

(b) the rate of N₂ consumption = 0.0303 M/s

Explanation:

(a) To solve the question we note that the reaction consists of one mole of N₂ combining with three moles of H₂ to form 2 moles of NH₃

N₂(g) + 3H₂(g) → 2NH₃(g)

The rate of reaction of molecular hydrogen = 0.091 M/s, hence we have

3 moles of H₂ reacts to form 2 moles of NH₃, therefore

0.091 M of H₂ will react to form 2/3 × 0.091 M or 0.061 M of NH₃

Hence the rate of ammonia formation is 0.061 M/s

(b) From the reaction equation we have 3 moles of H₂ and one mole of N₂ being consumed at the same time hence

0.091 M of H₂ is consumed simultaneously with 1/3 × 0.091 M or 0.0303 M of N₂

Therefore the rate of consumption of N₂ = 0.0303 M/s

6 0
3 years ago
What is the periodic # for uranium?
ruslelena [56]

Answer:

92

Explanation:

4 0
4 years ago
Read 2 more answers
Determine the concentration of a solution of sodium hydroxide (NaOH) using a 0.500M Potassium Hydrogen Phthalate (KHP) standard
Svetradugi [14.3K]

Answer:

0.425M NaOH assuming the volume of KHP was 25.50mL and the volume of the NaOH solution was 30.0mL

Explanation:

The KHP reacts with NaOH as follows:

KHP + NaOH → KNaP + H₂O

<em>Where 1 mole of KHP reacts per mole of KNaP</em>

<em />

That means, the moles of KHP added to the NaOH solution = Moles NaOH at equivalence point. With the moles of NaOH and the volume in liters we can find the molar concentration of NaOH.

<em>Assuming the volume added of KHP was 25.50mL and the solution of NaOH contains 30.0mL (0.0300L), the concentration of the NaOH is:</em>

<em />

<em>Moles KHP = Moles NaOH:</em>

25.50mL = 0.02550L * (0.500mol / L) = 0.01275 moles KHP = Moles NaOH

<em>Molarity NaOH:</em>

0.01275 moles NaOH / 0.0300L =

<h3>0.425M NaOH assuming the volume of KHP was 25.50mL and the volume of the NaOH solution was 30.0mL</h3>
7 0
3 years ago
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