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3 years ago

It process information and sends instruction? A. brain B. kidney C. heart D. lungs

Chemistry

2 answers:

maw [93]3 years ago

5 0

Answer:

A. brain

Explanation:

every instruction to us is sent by brain

insens350 [35]3 years ago

4 0

Answer:

A. Brain

Explanation:

It assembles the messages in a way that has meaning for us, and can store that information in our memory.

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Which of the following is a correct Lewis structure?

ololo11 [35]

Answer:

The answer to your question is letter B

Explanation:

a. [: C≡C :] This option is not correct because Carbon only has 4 valence electrons and carbons in this structure have 5, this structure does not exist.

b. [: N≡N :] This option is correct because because Nitrogen has 5 valence electrons and this structure shows that number of electrons.

c. No right choice. This option is incorrect because letter B is correct.

8 0

3 years ago

Read 2 more answers

Hemoglobin, a protein in red blood cells, carries O2 from the lungs to the body's cells. Iron (as ferrous ion, Fe2+) makes up 0.

levacccp [35]

Answer: The number of $Fe^{2+}$ ions in one molecule of hemoglobin are 4.

Explanation:

According to mole concept:

1 mole of an element contains $6.022\times 10^{23}$ number of atoms.

We are given:

Mass of 1 mole of hemoglobin = $6.8\times 10^4g$

Using above equation:

$6.022\times 10^{23}$ number of molecules have a mass of $6.8\times 10^4g$

So, 1 molecule of hemoglobin will have a mass of $\frac{6.8\times 10^4g}{6.022\times 10^{23}}\times 1=1.129\times 10^{-19}g$

It is also given that 0.33 mass % of hemoglobin has $Fe^{2+}$ ions

So, mass of $Fe^{2+}$ ions will be = $\frac{0.33}{100}\times 1.129\times 10^{-19}g=3.7257\times 10^{-22}g$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of iron ion = $3.7257\times 10^{-22}g$

Molar mass of iron ion = 55.85 g/mol

Putting values in above equation, we get:

$\text{Moles of }Fe^{2+}\text{ ion}=\frac{3.7257\times 10^{-22}g}{55.85g/mol}=6.67\times 10^{-24}mol$

Using mole concept:

1 mole of an element contains $6.022\times 10^{23}$ number of atoms.

So, $6.67\times 10^{-24}$ moles of hemoglobin will contain = $6.022\times 10^{23}\times 6.67\times 10^{-24}=4$

Hence, the number of $Fe^{2+}$ ions in one molecule of hemoglobin are 4.

8 0

3 years ago

Hey can anyone explain this . How to make covalent bond of Oxygen ??

viva [34]

Answer:

Explanation:

A covalent bond is where electrons are shared equally between molecules. if you see the bottom of the page each oxygen is missing 2 electrons so they share two of one of their own with eachother and give oxygen a full octet. it doesnt have to be full to be a covallent bond but it just has to share them evenly rather than keep it to themselves

3 0

3 years ago

Which statement is true about the elements in the periodic table?

s2008m [1.1K]

Answer:

Statment 2

Explanation:

This is just an educated guess

4 0

3 years ago

Read 2 more answers

Ptrpared a solution of sodium chloride (NaCl) by measuring out 49.Umol of sodium chloride into 150. ML. Volumetric flask and fil

ArbitrLikvidat [17]

Answer:

The answer to your question is below

Explanation:

Data

Substance = NaCl

moles of NaCl = 49

volume = 150 ml

Process

Molarity is a unit of concentration that makes a relation of the moles of a substance and the volume.

Molarity = moles / volume (L)

1.- Convert 150 ml to L

1000 ml ------------------ 1 L

150 ml ----------------- x

x = (150 x 1) / 1000

x = 0.15 L

2.- Substitution

Molarity = 49 / 0.15

Molarity = 326. 7

I have a doubt if the number of moles is 49 moles or 49μmoles

4 0

4 years ago

It process information and sends instruction? A. brain B. kidney C. heart D. lungs​

It process information and sends instruction? A. brain B. kidney C. heart D. lungs