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andrey2020 [161]
3 years ago
5

How many protons, neutrons and electrons are in these atoms?

Chemistry
1 answer:
storchak [24]3 years ago
7 0

Answer:

A. Proton = 6

Neutron = 7

Electron = 6

B. Proton = 56

Neutron = 74

Electron = 56

C. Proton = 92

Neutron = 140

Electron = 92

Explanation:

A. Mass number = 13

Atomic number = 6

Proton = Atomic number = 6

Since the element has no charge,

Electron = proton = 6

Mass number = proton + Neutron

Neutron = Mass number — proton

Neutron = 13 — 6 = 7

B. Mass number = 130

Atomic number = 56

Proton = Atomic number = 56

Since the element has no charge,

Electron = proton = 56

Mass number = proton + Neutron

Neutron = Mass number — proton

Neutron = 130 — 56 = 74

C. Mass number = 232

Atomic number = 92

Proton = Atomic number = 92

Since the element has no charge,

Electron = proton = 92

Mass number = proton + Neutron

Neutron = Mass number — proton

Neutron = 232 — 92= 140

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slavikrds [6]

We have to know how urbanization causes pollution.

The reason is: People in urban areas consume more energy, food, and water.

Urbanisation is one of the major problem towards pollution. The smoke from automobiles, factories and power generators make air unhealthy. Also chemical spills and other toxic gases contaminate in air.

The mixing of toxins in the soil is polluting soil which disturbs eco-system.

The high density population in urban area consume more energy , food and water which causes pollution.

7 0
3 years ago
Read 2 more answers
Which Formula represents an asymmetrical molecule?
9966 [12]
The answer is NH3 I hope this helps y’all out....
8 0
3 years ago
Using the equation below, if you have 4.3 mol of nitrogen tribromide and
ankoles [38]

Answer:

sodium hydroxide is the limiting reactant

Explanation:

The first step is usually to put down the balanced reaction equation. This is the first thing to do when solving any problem related to stoichiometry. The balanced reaction equation serves as a guide during the solution.

2NBr3 + 3NaOH = N2 + 3NaBr + 3HOBr

Let us pick nitrogen gas as our product of interest. Any of the reactants that gives a lower number of moles of nitrogen gas is the limiting reactant.

For nitrogen tribromide

From the balanced reaction equation;

2 moles of nitrogen tribromide yields 1 mole of nitrogen gas

4.3 moles of nitrogen tribromide will yield 4.3 ×1/ 2 = 2.15 moles of nitrogen gas

For sodium hydroxide;

3 moles of sodium hydroxide yields 1 mole of nitrogen gas

5.9 moles of sodium hydroxide yields 5.9 × 1/ 3= 1.97 moles of nitrogen gas

Therefore, sodium hydroxide is the limiting reactant.

8 0
2 years ago
Balance the following skeleton ionic reaction, and calculate E°cell to decide whether the reaction is spontaneous: Ag(s) + Cu2+
tia_tia [17]

Answer:

2Ag(s) + Cu^2+(aq) ----------> 2Ag^+(aq) + Cu(s)

Explanation:

Ag(s)/Ag^+ (aq) is the anode as shown while Cu^2+(aq)/Cu^2(s) is the cathode.

E°cell= E°cathode -E°anode= 0.34 -0.80= -0.5V

The cell is not spontaneous as written because E°cell is negative. This implies that the electrodes of the cell must be interchanged to make the cell spontaneous.

5 0
3 years ago
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If the edge length of the unit cell is 705.2 pm, what is the density of KI in g/cm3.
Kipish [7]

The density  is 3.144 g / cm^3.

<u>Explanation</u>:

If effective number of atom in NaCl type structure, z = 4

a = 705.2 pm ⇒ In centimeter = 705.2 \times 10^-10

Na = 6.023 \times 10^23

density = (molecular weight) (z) / (Na) (a^3)

where molecular weight of KI is 166 g,

           Z represents the atomic number

density = (molecular weight) (z) / (Na) (a^3)              

             = (166 \times 4) / (6.023 \times 10^23) \times (705.2 \times 10^-10)

density = 3.144 g / cm^3.

5 0
3 years ago
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