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gulaghasi [49]
3 years ago
6

Classify the following as either an anion or a cation.

Chemistry
1 answer:
Sloan [31]3 years ago
7 0

Answer:Anion: CN-, CrO42-, CI-

Cation: H3O+, Cu+, C7H7+, Na+

Explanation:

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Which of the processes of the water cycle occur by releasing energy
REY [17]
The process of condensation it releases energy up into the atmosphere where the clouds form.
6 0
4 years ago
4. The solubility of acetanilide in hot water is 5.5 g / 100 mL at 100oC and its solubility in cold water is 0.53 g / 100 mL at
Triss [41]

Answer:

89,4%

Explanation:

If you have a solutio of 2,5g of acetanilide in 50mL of water and you warm this solution to 100°C you will dissolve all acetanilide because the maximum solubility in 50mL will be:

5,5g / 100mL → 2,75g / 50mL.

Then, if you cold the water to 0°C the solubility in 50mL will be:

0,53g / 100mL → 0,265g / 50mL.

That means you will precipitate:

2,5g - 0,265g = <em>2,235g of acetanilide</em>

The theoretical percent recovery will be:

2,2365g / 2,5g ×100 = <em>89,4%</em>

<em></em>

I hope it helps!

7 0
3 years ago
Radiometric dating is the workhorse of absolute dating. If you had a sample with a radioactive component with a half-life of 500
PSYCHO15rus [73]
The amount left over after T years where P is initial amount is P( \frac{1}{2})^{ \frac{t}{5000} }
it halves each time so after t times of the 5000 years have elapsed, the amount is now (1/2)^t of the original amount

find how many half lives

10000/5000=2
(1/2)^2=1/4
1/4 of original amount after 10000 years

after 50000 years
50000/5000=10
(1/2)^10=1/1024
1/1024 of original amount after 50000 years


it dissapears when it attains an amount you deem is nigligible, so if you had 1 mol of subsutance, you might say it dissapears when it gets to 10^-23 or about 6.02 molecules



5 0
4 years ago
A chemist makes a solution of Ca(NO3)2 by dissolving 21.3 g Ca(NO3)2 in water to make 100.0 mL of solution. What is the concentr
anastassius [24]

Answer:

[NO₃⁻ ] = 2.596 M

Explanation:

Ca(NO₃)₂ dissolves in water according to the following equation:

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

The moles of Ca(NO₃)₂ that dissolve is found as followed:

(21.3 g) / (164.10 g/mol) = 0.1298... mol

The number of NO₃⁻ ions are related to the above quantity by the molar ratio:

(0.1298 mol Ca(NO₃)₂) (2NO₃⁻/Ca(NO₃)₂) = 0.2596...mol NO₃⁻

The concentration of the nitrate ions is then calculated:

[NO₃⁻ ] = (0.2596...mol) / (100.0ml) x (1000mL/L) = 2.596 M

6 0
3 years ago
In which atmosphere layer do humans live most of their life
marysya [2.9K]
Troposphere, this is the layer of the atmosphere closest to the earths crust.
3 0
3 years ago
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