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USPshnik [31]
2 years ago
12

Geologists discover what seems to be a new, powdery substance, deep underground. When they analyze it it's found to contain, amo

ngst other things, potassium and iodine.
Which of the following are ruled out about this substance?

A. It is a mixture

B. It is a compound

C. It has a lattice structure

D. It is made up of molecules

E. It is an element
Chemistry
2 answers:
nikdorinn [45]2 years ago
8 0
The answer to your question is I think B
german2 years ago
5 0

Answer:

Explanation b:

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You need to prepare a solution with a specific concentration of Na+Na+ ions; however, someone used the end of the stock solution
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Explanation:

Ionic equation

NaCl(aq) --> Na+(aq) + Cl-(aq)

Na2SO4(aq) --> 2Na+(aq) + SO4^2-(aq)

In NaCl solution, 1 mole of Na+ is dissociated in 1 liter of solution while in Na2SO4, 2 moles of Na+ is dissociated in 1 liter of solution.

Molecular weight of NA2SO4 = (23*2) + 32 + (16*4)

= 142 g/mol

Molecular weight of NaCl = 23 + 35.5

= 58.5 g/mol

Masses

% Mass of NA+ in Na2SO4 = mass of Na+/total mass of Na2SO4 * 100

= 46/142 * 100

= 32.4%

% Mass of NA+ in NaCl = mass of Na+/total mass of NaCl * 100

= 23/58.5 * 100

= 39.3%

Therefore, the % mass of Na+ in NaCl and Na2SO4 are different so it cannot be used.

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3 years ago
The area that includes everything between the cell membrane and the nucleus of a cell is called the
kolbaska11 [484]

Answer:

Cytoplasm.

Explanation:

Please mark as Brainliest! :)

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3 years ago
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elixir [45]
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The part of the flower responsible for producing pollen (sperm) is the _______.
IgorC [24]
Hello,

Here is your answer:

The proper answer to this question is option C "stigma".

Here is how:

The stigma is responsible for producing pollen in a plant.

Your answer is C.

If you need anymore help feel free to ask me!

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