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Vladimir79 [104]
3 years ago
14

What periodic element is from Europe

Chemistry
2 answers:
Natasha2012 [34]3 years ago
8 0
I think it would be Europium
masya89 [10]3 years ago
3 0

Answer:

Europium

Explanation:

Europium

Europium was isolated in 1901 and is named after the continent of Europe.

Europium - Wikipediaen.wikipedia.org › wiki › Europium

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The student plans to conduct a spectrophotometric analysis to determine the concentration of Cu2+(aq) in a solution. The solutio
Lelechka [254]

Answer:

The wavelength the student should use is 700 nm.

Explanation:

Attached below you can find the diagram I found for this question elsewhere.

Because the idea is to minimize the interference of the Co⁺²(aq) species, we should <u>choose a wavelength in which its absorbance is minimum</u>.

At 400 nm Co⁺²(aq) shows no absorbance, however neither does Cu⁺²(aq). While at 700 nm Co⁺²(aq) shows no absorbance and Cu⁺²(aq) does.

6 0
3 years ago
Which of the statements is correct?
Step2247 [10]

Answer:

<u>A. Magnet has a north pole and south pole.</u>

Explanation:

- A magnet has a north and south pole

- Magnets attract paper clips due to the metals present

- Magnetic fields are not visible

- North pole and south pole attract each other

Only the first statement is correct, the answer is (A).

8 0
3 years ago
Read 2 more answers
In an experiment Nyla collected the following information about a solution made from a certain food:
lorasvet [3.4K]

Answer:

D

Explanation:

pH<7

so it must be acid

easy ;)

4 0
3 years ago
Can someone please please help me with the first two !!!! I really need to turn this in !!!!!
kati45 [8]

Answer:

Be Electron configuration: 1s2 2s2

Be Orbital Diagram: \//\    \//\ (it would be little arrows going up and down to show the spins)

F Electron Configuration: 1s2 2s2 2p5

F Orbital Diagram: \//\    \//\    \//\ \//\ \/

7 0
3 years ago
Rick is creating a love potion for Morty. To make the potion, Rick's needs 51 mL of a mixture solution where 40% is carbonated w
Deffense [45]

Answer:

The amount of the first solution rick needs to mix together to create the love portion is 8.5 mL

Explanation:

So as to make the love potion, we have;

The percentage of carbonated water in the love portion = 40%

The percentage of green tea in the first solution = 65%

The percentage of carbonated water in the first solution = 15%

The percentage of whole milk in the first solution = 20%

The percentage of orange juice in the second solution = 17%

The percentage of lemonade in the second solution = 38%

The percentage of carbonated water in the second solution = 45%

Let 'x' represent the volume in mL of the first solution added to make the love portion, and let 'y' be the volume in mL of the second solution added to make the love portion, we have;

x + y = 51...(1)

0.15·x + 0.45·y = 0.40×51 = 20.4

0.15·x + 0.45·y = 20.4...(2)

Solving the system of simultaneous equation by making 'y' the subject of each of the equation gives;

For equation (1)

y = 51 - x

For equation (2)

y = 20.4/0.45 - (0.15/0.45)·x = 136 - 3·x

y = 136/3 - (1/3)·x

Equating the two equations of 'y', gives;

51 - x = 136/3 - (1/3)·x

51 - 136/3 = x - (1/3)·x

17/3 = (2/3)·x

(2/3)·x = 17/3

x = (3/2) × (17/3) = 17/2 = 8.5

x = 8.5

y = 51 - x = 42.5

y = 42.5

Therefore, the amount of the first solution rick needs to mix together to create the love portion, x = 8.5 mL

8 0
3 years ago
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