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ycow [4]
2 years ago
14

A sample originally contains 24 grams of a radioactive isotope. After 18 days, 18.8 grams of the isotope remain in the sample. W

hat is the half-life of the isotope
Chemistry
1 answer:
LenKa [72]2 years ago
8 0
Around 36 or 37 days, because of the decimal
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What is the mass in grams of 7.23 miles of dinitrogen trioxide?
nevsk [136]

Answer:

549.563868

Explanation:

1 mole is equal to 1 moles N2O3, or 76.0116 grams. so 76.0116 x 7.23 = 549.563868

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3 years ago
Which choice below represents a negative impact that chemistry has on society?
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Answer:It’s C on edge 2020

(Combustion of car engines producing pollutants in the air)

Explanation:

I got it right :))

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3 years ago
Let’s say you have 3 UV active spots in the crude material and co-spot TLC plate. One has the same Rf value as the starting mate
Troyanec [42]

Answer:

Answer: (1R,2S) / (1S, 2R) , (1R,2R) / (1S, 2S)  

Explanation:

Sodium borohydride reduction of benzoin will give four possible stereo isomers out of which are (1R,2S) - (1S, 2R) isomers and (1R,2R) - (1S, 2S) isomers which are known as enantiomers.

In general enantiomers show single spot in the TLC as they do not show any difference in Rf value (i.e) (1R,2S) - (1S, 2R) isomers show only one spot although they are two compounds and also (1R,2R) - (1S, 2S) isomers also show one spot. That is the reason why you are observing two spots in the TLC ( of reaction mixture) other than starting materilal.

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2 years ago
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Which compounds were classified as organic compounds according to the early chemists​
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Answer:

Organic compound, any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen.

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A porpoise sends out an ultrasonic burst and hears the echo off his favorite food in 0.13 seconds. How far away is the food sour
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Explanation:

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