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4 years ago

Situation: you accidentally left the butter on the table after using it.

Biology

1 answer:

defon4 years ago

6 0

It will melt because it is probably hot.

I would probably clean it.

Stop leaving butter on the table.

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Minchanka [31]

Colors give butterflies camouflage, which helps them avoid hungry predators.

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3 years ago

The average human body contains 6.10 L of blood with a Fe2+ concentration of 1.50×10−5 M . If a person ingests 12.0 mL of 14.0 m

Crank

Answer: The percentage of iron(II) in the blood sequestered by the cyanide ion is 18.4%

Explanation:

Having the reaction NaCN(ac) + Fe2+ ⇒ CNFe + Na+ ; you could follow this procedure:

1. Find the number of moles of Fe2+ in the 6.10L of blood and the number of moles of CN- in the 0.012L (0.012L=12mL) solution.

First, notice that the amount of CN- moles in the 12mL solution is the same as if we were looking for the amount of moles NaCN in the solution. This is because most sodium salts dissociate completely in aqueous solution.

Then having the Molar concentrations of both CN- and Fe2+:

Fe2+ concentration = 1.5x $10^{-5}$ M = 1.5x $10^{-5}$ moles (n)/L

Moles de Fe2+ en 6.01L= (1.5x $10^{-5}$ moles (n)/L)*6.01L= 9.15x $10^{-5}$ moles

NaCN or CN- concentration = 14mM=0,0014M=(0,0014n/L)

Moles de CN- en 0,012L= (0,0014n/L)*0,012L= 1.68x $10^{-5}$ moles

2. Understand how many moles of Fe2+ are sequestered by CN- :

Beacause 1 mol of CN- react (sequester) with 1 mol of Fe2+ to form 1 mol of CNFe, then 1.68x $10^{-5}$ moles of CN- is going to sequester 1.68x $10^{-5}$ moles of Fe2+ to form 1.68x $10^{-5}$ moles of CNFe.

3. Calculate the percentage of Fe2+ sequestered:

% Fe2+ = (moles of Fe2+ sequestered/Total moles of Fe2+ in the blood)*100

⇒ % Fe2+ = (1.68x $10^{-5}$ ) / (9.15x $10^{-5}$ )=0.184*100 = 18.4% Percentage of Fe2+ moles sequestered by cyanide ion (CN-).

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3 years ago

What is the meaning of selective premeable

Flura [38]

Answer:

Selective permeability is a property of cellular membranes that only allows certain molecules to enter or exit the cell. ... Movement across a selectively permeable membrane can occur actively or passively. For example, water molecules can move passively through small pores on the membrane.

Explanation:

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3 years ago

Opinions are an important part of scientific data collection and analysis. True or False

jarptica [38.1K]

That answer is true hope that helps you

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4 years ago

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Xenotransplantation is using nonhuman animal organs in transplantation. Many people are against this practice. What would be the

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3 years ago