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CaHeK987 [17]
3 years ago
14

Which statement about the greenhouse effect is NOT true?

Chemistry
1 answer:
Archy [21]3 years ago
7 0
<span> Greenhouse gases were not historically present in the atmosphere.</span>
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How many minutes will it take to plate out 4.50 g of Cu from a solution of Cu(NO3)2 (aq) onto the cathode of an electrolytic cel
ipn [44]

Answer:

It will take 28.5 minutes

Explanation:

<u>Step 1: </u>Data given

Mass of Cu = 4.50 grams

8.00 A of current are used

Molar mass of Cu = 63.5 g/mol

Step 2: Calculate time needed

Cu2+ →Electricity → Cu

we notice a flow of 2 electrons ⇒ This means the Faraday constant = 2F

Since Molar mass of Cu is 63.5 g/mol

63.5 grams of Cu is deposited by 2*96500 C

4.50 grams of Cu ((2*96500)/63.5)  * 4.50 = 13677.17 C

Q = It

13677.17 = 8t*60 seconds

t = 28.5 minutes

3 0
3 years ago
The proposed mechanism for a reaction is: Step 1: A + B X (fast) Step 2: X + C Y (slow) Step 3: Y D (fast) What is the overall r
PolarNik [594]

Answer:

(slow)xy2+z→xy2z (fast) c step1:step2:xy2+z2→xy2z2

Explanation:

Step1: xy2+z2→xy2z2 (slow)

Step2: xy2z2→xy2z+z (fast)

2XY 2 + Z 2 → 2XY 2 Z

Rate= k[xy2][z2]

 

When the two elementary steps are summed up, the result is equivalent to the stoichiometric equation. Hence, this mechanism is acceptable. The order of both elementary steps is 2, which is ‘≤3’; this also makes this mechanism acceptable. Furthermore, the rate equation aligns with the experimentally determined rate equation, and this also makes this mechanism acceptable. Therefore, since all the three rules have been observed, this mechanism is possible.

5 0
3 years ago
help please, How much water would you need to add to the 10 grams of sodium hydroxide to make 100 grams of the 10% solution?
jonny [76]

Answer:

90

Explanation:

gshhhshussussussjsuushhshjssuss

5 0
3 years ago
Which element would have the largest radius; Br or Se? Explain
dusya [7]
The atomic radium increases to the left and downwards on the periodic table. 
By that logic, Se has the largest radius.
5 0
3 years ago
If you were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials, which would you consider mo
Novosadov [1.4K]

aswer: protactinium-234 is more dang erous than uranium

6 0
2 years ago
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