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kenny6666 [7]
3 years ago
12

J.j thomson a british physicist was the first to identify the

Chemistry
1 answer:
Shalnov [3]3 years ago
5 0
<span>J.j thomson a british physicist was the first to identify the electron in 1987</span>
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the scientific law of conservation of mass states that the total amount of mass in an isolated system remains constant. This mea
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It describes how, when particles/mc/elements react, despite forming different substances the mass is neither created nor destroyed but only converted.
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It is necessary to have a 40% antifreeze solution in the radiator of a certain car. the radiator now has 70 liters of 20% soluti
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The answer is : 17.5 liters drained and replaced by 17.5 liters of 100% solution. 
x = amount drained and replaced
(70-x) = remaining amount of 20% solution
<span>.20(70-x) + 1.00(x) = .40(70)
14 - .2x + 1x = 28
1x - .2x = 28 - 14
</span><span>.8x = 14
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Summarize why the carbon cycle supports the Law of Conservation of Matter
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Mercury thermometers work because mercury ____ when it is warmed
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Mercury expands when it is heated. This process is called thermal expansion.
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3 years ago
The three naturally occurring isotopes of potassium are 39K, 38.963707u; 40K, 39.963999u; and 41K.The percent natural abundances
sweet-ann [11.9K]

Answer:

The isotopic mass of 41K is 40.9574 amu

Explanation:

Step 1: Data given

The isotopes are:  

39K with an isotopic mass of 38.963707u and natural abundance of 93.2581%

40K with an isotopic mass of 39.963999u

41K wit natural abundance of 6.7302 %

Average atomic mass =39.098 amu  

Step 2: Calculate natural abundance of 40 K

100 % - 93.2581 % - 6.7302 %

100 % = 0.0117 %

Step 3: Calculate isotopic mass of 41K

39.098 = 38.963707 * 0.932581 + 39.963999 * 0.000117 + X * 0.067302

39.098 = 36.33681 + 0.0046758 +  X * 2.067302

X = 40.9574 amu

The isotopic mass of 41K is 40.9574 amu

8 0
3 years ago
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