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goldenfox [79]
3 years ago
5

Which statement best explains the importance of nerve cells?

Chemistry
2 answers:
faltersainse [42]3 years ago
7 0

first one, nerve cells are used to send messages from different parts of the body to the brain.

Free_Kalibri [48]3 years ago
6 0
Nerve cells re used to send messages from different parts of the body to the brain
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Which of the following has a higher electronegativity oxygen or selenium?
bonufazy [111]

Answer:

Between oxygen and selenium, oxygen is more electronegative because of more ionisation energy and small size

Explanation:

7 0
3 years ago
Ammonia, NH 3 , may react with oxygen to form nitrogen gas and water. 4 NH 3 ( aq ) + 3 O 2 ( g ) ⟶ 2 N 2 ( g ) + 6 H 2 O ( l )
Alex Ar [27]

Answer:

The limiting reactant is NH₃

0.0186moles of N₂ are the one produced by the limiting reactant

0.020 moles of N₂ are the one produced by the reactant in excess

Explanation:

This is the reaction

4NH₃ + 3O₂  → 2N₂ + 6H₂O

We should calculate the moles of each reactant

Mass / Molar mass = Moles

3.55 g / 17g/m = 0.208 moles NH₃

5.33 g / 32g/m = 0.166 moles O₂

4 moles of ammonia react with 3 moles of oxygen

0.208 moles of ammonia react with (0.208  .3)/4 = 0.156 moles O₂

We have 0.166 moles of O₂ and we need 0.156 moles, so O₂ is the reactant in excess.

3 moles of O₂ react with 4 moles of NH₃

0.166 moles of O₂ react with (0.166 . 4)/ 3 = 0.221 moles

We have 0.208 moles NH₃ and we need 0.221, so NH₃ is the limiting reactant.

To know the moles of N₂, let's apply the Ideal Gas Law

P.V =n.R.T

1atm . 0.450L = n . 0.082 . 295K

0.450 / (0.082 .295) = 0.0186 moles

If we have 100 % yield reaction:

4 moles NH₃ make 2 moles N₂

0.208 moles NH₃ make (0.208  .2)/4 = 0.104 moles

So the % yield reaction is.

0.104 moles ___ 100%

0.0186 moles ___ 17.9%

0.0186moles of N₂ are the one produced by the limiting reactant.

3 moles of O₂ produce 2 moles N₂

0.166 moles O₂ produce  (0.166  .2)/3 = 0.111 moles

Now, we apply the yield.

100% ____ 0.111 moles

17.9% = 0.020 moles

8 0
3 years ago
Read 2 more answers
1 Defing polymerization​
elena-14-01-66 [18.8K]

Answer:

Polymerization is a process through which a large number of monomer molecules react together to form a polymer. The macromolecules produced from a polymerization may have a linear or a branched structure.

Explanation:

4 0
2 years ago
Read 2 more answers
Which of the following elements has 3 electrons in the outermost d orbital?
Nina [5.8K]

Answer:

A

Explanation:

Element A has 3 electrons in outermost shell so its valency is 3. It will loose 3 electrons to attain stability, as loss of 3 electrons is easier than gain of 5 electrons.

Valency of B is −2 as it will gain 2 electrons to attain stability and combine with other atom.

Valency of A⟶+3

Valency of B⟶−2

(Refer to Image)

Cross multiply valency of A and B

∴A2B3 compound will be formed.

3 0
3 years ago
List 4 ways that exercise affects the circulatory system and the respiratory system? Give me a good answer please
KengaRu [80]
<h2>Long term benefits</h2>
  • Increased heart rate.
  • Increased breathing rate.
  • Increase in systolic blood pressure.
  • Increase vasodilation of blood vessels in the working muscles.
  • Increased volume of air in the lungs.
  • Increased stroke volume.
  • Increased cardiac output.
4 0
3 years ago
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