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hichkok12 [17]
3 years ago
5

An atom has 81 electrons, 84 neutrons, and 82 protons. What element is this atom?

Chemistry
1 answer:
posledela3 years ago
4 0

Answer:

Lead

Explanation:

The subatomic particles within an atom can be used to know the atom or element given.

Of particular interest is the number of protons within the atom.

The periodic table is based on the atomic number of atoms. This atomic number is the number of protons within an atomic space.

So; If we know the number of protons within an atom, we can know the element.

The number of protons given is 82, the element is  therefore lead.

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IgorC [24]
The ranking of most eagles in the food chain is at the top. They are called apex predator.

The harpy eagle is one of the largest eagle there is. Common to most eagles are its sharpness of their vision. Most eagles use it to sight their predator while circling above the ground at a distance unseen by the prey. However, harpy eagles adapted a way of hunting prey which is called perch-hunting.

Perch-hunting is a way of looking for predator by scanning the trees for prey by flying in short distances from a tree to another tree. The harpy eagle developed this skill since it is hard to sight a prey in a rain forest because of the leaves and trees blocking its vision. Hence, perch-hunting is very apt for the scenario of a rain forest eagle.
3 0
3 years ago
At 2000 ∘c the equilibrium constant for the reaction 2no(g)⇌n2(g)+o2(g) is kc=2.4×103. part a if the initial concentration of no
luda_lava [24]

Answer:

[NO] = 1.72 x 10⁻³ M.  

Explanation:

  • For the reaction:

<em>2NO(g) ⇌ N₂(g)+O₂(g),</em>

Kc =  [N₂][O₂] / [NO]².

  • At initial time: [NO] = 0.171 M,  [N₂] = [O₂] = 0.0 M.
  • At equilibrium: [NO] = 0.171 M - 2x ,  [N₂] = [O₂] = x M.

∵ Kc =  [N₂][O₂] / [NO]².

∴ 2400 = x² / (0.171 - 2x)² .

<u><em>Taking the aquare root for both sides:</em></u>

√(2400) = x / (0.171 - 2x)  

48.99 = x / (0.171 - 2x)  

48.99 (0.171 - 2x) = x  

8.377 - 97.98 x = x

8.377 = 98.98 x.

∴ x = 8.464 x 10⁻².

<em>∴ [NO] = 0.171 - 2(8.464 x 10⁻²) = 1.72 x 10⁻³ M.  </em>

<em>∴ [N₂] = [O₂] = x = 8.464 x 10⁻² M.</em>

3 0
3 years ago
Help please! Chem hw
DiKsa [7]
Hello!

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• O2 in the blood of a person who is in a hyoerbaric chamber.

• The partial pressure of an anesthetic gas is increased.

• The temperature is decreased.


GAS SOLUBILITY DECREASES:

• CO2 In a can of soda as it warms to room temperature.

• The pressure of a gas over a solvent is decreased.

I really hope this helped you! :)
6 0
3 years ago
Problem
Naddik [55]

Answer:

Mass of products equals mass of the reactants. If you build a campfire like this one, you start with a big pile of logs. As the fire burns, the pile of logs slowly shrinks. By the end of the evening, all that's left is a small pile of ashes.

Explanation:

i learned this in science before

5 0
3 years ago
What is a solution called when it contains as much solute as it can possibly hold at a given temperature?
8090 [49]
Saturated solution is when a solution has dissolved as much as it can
4 0
4 years ago
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