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4 years ago

How has technology helped the world?

Biology

2 answers:

slava [35]4 years ago

6 0

Answer:

everything now is mostly technology

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Nesterboy [21]4 years ago

5 0

Idk man, the fact that it helped the world is kinda an iffy subject‍♀️

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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-).

3 0

3 years ago

When an rh-negative mother has been sensitized and is pregnant with an rh-positive fetus, what happens to the fetus?

Rainbow [258]

The correct answer is "profound red cell hemolysis"

An Rh negative mother that has been sensitized means that the mother developed anti-Rh antibodies therefore these antibodies will attack the red blood cells of the Rh positive fetus as this fetus has the Rh antigen on his or her red blood cell. This will cause profound red cell hemolysis.

6 0

3 years ago

The "cheek" is the common name for the insect ________.

antiseptic1488 [7]

The 'cheek' is the common name for the insect GENA.
The gena is located in the head area of insects. The gena forms the sclerotized area on each side of the head, below the compound eyes, which extends to the gular structure. The gena varies among species of insects.

7 0

3 years ago

What responses it takes to open or close ion channels

Vitek1552 [10]

Depolarization and Hyperpolarization occurs when ion channels open and close.

Explanation:

In some specific part of the membrane of neuron, the potential of the membrane becomes less positive it is that results in Hyperpolarization. Depolarization is in contrast with this, since the potential of the membrane will become less negative in this type. these two types occurs during the opening and closing of ion channels that are present in the membrane. This will result making the ions either entering the cell or exiting the cell.

hyperpolarization occurs when the channels opens and resulting in letting the ions that are positive to exit out of the cell. When the channel opening results in letting the positively charged ions to get into the cell, then depolarization occurs. The channel opening and closing highly depends on the binding nature of the molecules that are signalling.

3 0

3 years ago

Jessica is in labor with her first child. her contractions, which are about 5 minutes apart, are enabled by ______.

seropon [69]

Answer;

-Oxytocin

Oxytocin;

-Oxytocin is a hormone and a neurotransmitter that is involved in childbirth and breast-feeding. It is also associated with empathy, trust, sexual activity, and relationship-building.

-Oxytocin is a neurotransmitter and a hormone that is produced in the hypothalamus. From there, it is transported to and secreted by the pituitary gland, at the base of the brain. It plays a role in the female reproductive functions, from sexual activity to childbirth and breast feeding.

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4 years ago