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nignag [31]
3 years ago
14

how can you find the common denominator and least commom denominator?? Help and thx i accedentaly clicked on the wrong subject

Chemistry
1 answer:
Marianna [84]3 years ago
7 0

Common denominator - Find the Least Common Multiple of the denominators (which is called the Least Common Denominator).

Change each fraction (using equivalent fractions) to make their denominators the same as the least common denominator.

Then add (or subtract) the fractions, as we wish!

Least common denominator - You do the same thing for the common denominator

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What part of dalton’s atomic theory is disproved by the existence of isotopes?
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The part that says all atoms of a specific element always have the same mass. Isotopes of an atom have varying masses compared to the standard version of the element.
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Select the correct answer
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The compound CaSO4 ionizes into a calcium ion and a sulfate ion (SO4). Calcium has two electrons in its outer shell. Upon ioniza
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Answer:

-2

Explanation:

Calcium is the element of second group and forth period. The electronic configuration of Calcium is - 2, 8, 8, 2 or 1s^22s^22p^63s^23p^64s^2

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Thus, calcium loses two electrons to sulfate ion and sulfate ion accepts these electrons to form ionic bond.

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6 0
3 years ago
Description of how the combined gas law must be modified to introduce the number of moles
telo118 [61]
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8 0
3 years ago
The first-order rate constant for the decomposition of N2O5:
kifflom [539]

Answer:

0.0055 mol of N2O5 will remay after 7 min.

Explanation:

The reaction follows a first-order.

Let the concentration of N2O5 after 7 min be y

Rate = Ky = change in concentration of N2O5/time

K is rate constant = 6.82×10^-3 s^-1

Initial concentration of N2O5 = number of moles/volume = 2.1×10^-2/1.8 = 0.0117 M

Change in concentration = 0.0117 - y

Time = 7 min = 7×60 = 420 s

6.82×10^-3y = 0.0117 - y/420

0.0117 - y = 420×6.82×10^-3y

0.0117 - y = 2.8644y

0.0117 = 2.8644y + y

0.0117 = 3.8644y

y = 0.0117/3.8644 = 0.00303 M

Number of moles of N2O5 left = y × volume = 0.00303 × 1.8 = 0.0055 mol (to 2 significant digits)

5 0
3 years ago
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