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2 years ago

What is the meaning of Demography?

2 answers:

6 0

The study of statistics. Like the increase or decrease of things. For example birth rates or the size of the human population.

I hope this helps :)

avanturin [10]2 years ago

4 0

It is the study of the human population of a region statistically.

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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

Red blood cells that are bathed in blood neither shrink nor swell and burst. If the concentration of blood is 0.5 M, what could

natima [27]

If the concentration of blood is 0.5 M, and red blood cells that are bathed in blood neither shrink nor swell and burst, the concentration of cytoplasm of RBCs is A. 0.5m. An isotonic solution refers to two solutions that have the same water concentration on both sides of a membrane. So, cells in isotonic solution have the same water concentration as the isotonic solution and thus they will neither shrink nor swell and burst. If the concentration of blood is 0.5 M, the concentration of RBC cytoplasm must be the same (0.5 M).

6 0

3 years ago

PLEASE ANSWER!

Lunna [17]

Answer:The rate of photosynthesis is the dependent and concentration of carbon dioxide is the independent

Explanation:The rate of photosynthesis depends on how much carbon dioxide is being supplied which makes it the dependent variable

4 0

3 years ago

The paravertebral ganglia are connected via spinal nerves inwhich region?

Alex777 [14]

Answer:

Answer is thoracic region.

Explanation:

Paravertebral ganglia are subdivision of peripheral sympathetic nervous system , which is one of the part of autonomic nervous system found in mammals. Its components are superior and inferior mesenteric ganglia and celiac.

The spinal nerves are peripheral nerves arising from the spinal cord. These spinal nerves are altogether 31 pairs. 8 in cervical, 12 in thoracic, 5 lumbar, 5 in sacral, and 1 in caudal.

There are two types of spinal nerves composed of the sensory and motor fibres.

7 0

2 years ago

Describe how the successional stages would differ from primary succession

Vesna [10]

Primary succession is when things that grow on rocks and don't need soil, like lichen, break down the rocks and turn them into soil. Then things that grow on soil can grow, like algae and fungus and firther break down the soil.

The successional stages would be larger organisms like plants and animals.

3 0

2 years ago

What is the meaning of Demography? ​

What is the meaning of Demography?