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snow_tiger [21]
2 years ago
12

A neutral atom has 1 valence electron and its atomic mass is 39. How many

Chemistry
1 answer:
uranmaximum [27]2 years ago
5 0

Answer: I think probaly wrong so probaly dont

listen to me

Explanation:

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The student placed 10 mL of PbCl2 (saturated solution) in the test tube and added a pinch of NaCl. A white precipitate of PbCl2
zysi [14]

Answer:

Adding NaCl to a saturated PbCl2 solution will decrease the Pb2+ concentration.

Explanation:

If a solution is saturated this means it cannot dissolve more material.  

PbCl2 ⇆ Pb2+ + 2Cl-

Adding more Cl- in the solution is the same thing as trying to dissolve more of the material. In the solution, the concentration of Cl- will increase.

In order for the Ksp to maintain a constant value, the concentration of Pb2+ must decrease if the concentration of Cl- is increased.

Adding NaCl to a saturated PbCl2 solution will decrease the Pb2+ concentration.

6 0
3 years ago
A sealed vessel containg helium, chlorine and fluorine has a total pressure of 205 kpa and partial pressures of 15 kpa for chlor
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According to Dalton's law of partial pressure

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So if we know the partial pressure of all the gases we can determine the total pressure of the mxiture by adding all of them.

Thus

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Thus

Partial pressure of helium = 205 - ( 89 + 15) = 101 kPa

7 0
3 years ago
Determine the rate of a reaction that follows the rate law:
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Answer:

C

Explanation:

I am not 100% sure tho correct me if I'm wrong pls:/

8 0
3 years ago
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Analysis of an unknown compound reveals that the compound is 27.29% carbon and 72.71% oxygen. The molar mass of the compound is
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6 0
3 years ago
There are two beakers that contain the same liquid substance at the same temperature. The larger beaker is 1,000ml and the small
azamat

Answer:

Answer choice B

Explanation:

Since you do not know the volume of the liquid in each beaker, the one in the smaller beaker could have more substance and therefore more thermal energy. If they had the same amount of substance, then the more voluminous one would radiate faster. However, since you do not know this, there is no way to tell. PM me if you have more questions. Hope this helps!

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