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Lera25 [3.4K]
3 years ago
8

Jessie has never seen snow, but today the weather conditions may be just right! He knows the temperature on the Fahrenheit therm

ometer must be _______ degrees or lower for him to see his first snow fall.
A) 32 o
B) 20 o
C) -10 0
D) -32 0
Chemistry
2 answers:
BARSIC [14]3 years ago
7 0
32 would be your answer
Natalka [10]3 years ago
3 0
The answer is 32° F, because water freezes at this temperature under normal pressures, and snow is water vapor frozen into ice crystals. 




N.b., it usually needs to be a little bit colder to have snow, but this is around the maximum (although I've seen snow around 38° F before).
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_Au2S3 + _H2---> _Au + _H2S
timofeeve [1]
The answer is A because if you place the first two numbers 1 and 3
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H=6
It has to equal to the product so then you put in the last two numbers 2 and 3
Au=2
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4 0
3 years ago
Read 2 more answers
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Answer:

Ernest Rutherford

Explanation:

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Identify some other substances (besides KCl) that might give a positive test for chloride upon addition of AgNO3. do you think i
nlexa [21]

Answer:

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-It is reasonable to exclude iodides and bromides but it is not reasonable to exclude other chlorides

Explanation:

In the qualitative determination of halogen ions, silver nitrate solution(AgNO3) is usually used. Now, various halide ions will give various colours of precipitate when mixed with with silver nitrate. For example, chlorides(Cl-) normally yield a white precipitate, bromides(Br-) normally yield a cream precipitate while iodides (I-) normally yield a yellow precipitate. Thus, all these ions or some of them may be present in the system.

With that being said, if other chlorides are present, they will also yield a white precipitate just like KCl leading to a false positive test for KCl. However, since other halogen ions yield precipitates of different colours, they don't lead to a false test for KCl. Thus, we can exclude other halides from the tendency to give us a false positive test for KCl but not other chlorides.

5 0
3 years ago
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The reaction of acid, assuming HCl and calcium carbonate always produces a gas. The reaction is as follows:
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2 H+(aq) + CaCO3(s) --> Ca+2(aq) + H2O(l) + CO2(g)
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