Chemistry, 11.12.2020 01:40 jaimejohnston2

THIS IS QUESTION AND ANSWER Jessa is a medical research assistant. She is examining antibodies under a microscope. She has to categorize each type of antibody based on their functions. Which type of antibody is responsible for each of the following functions?

IgA-prevents bacteria and viruses from entering the body
IgD-is responsible for identifying antigens and producing antibodies to fight the foreign substance
IgM-is the front line of defense when fighting bacteria or viral antigens
IgE-releases histamine during an allergic reaction
These are the answers took test on edmen.

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Answer from: Quest

The correct answer is c. orbital shape. "the angular momentum quantum number l describes the shape of an orbital. it corresponds to each orbital type, i.e. (0,1,2,−1)=(s,p,d,f,g,"

Answer from: Quest

here are some of the ways in which chemical and nuclear reactions differ.

explanation:

$\begin{array}{ll}\qquad\textbf{chemical} & \qquad\textbf{nuclear} \\\text{energy changes $\approx 10^{2}$ kj} & \text{energy changes$\approx 10^{8}$ kj ($10^{6}$ times more}) \\\text{mass is conserved} & \text{mass changes to energy} \\\text{involves electrons} & \text{involves protons and neutrons} \\\text{atoms do not change} & \text{atoms transmute} \\\end{array}$

Answer from: Quest

answer : the correct answer is 2) hno₃ and naoh .

arrhenius concept of acid and base :

acid :

according to arrhenius acid are those which release h⁺ or hydronium ion (h₃o⁺) in aqueous solution .

example : hcl +h₂o ↔ h₃o⁺ + cl⁻

hcl is giving h₃o⁺ ion in water , hence it is an arrhenius acid .

base :

according to arrhenius , bases are those which releases oh⁻ ions in aqueous solution .

example : koh (aq) ↔ k⁺ + oh⁻

since koh is producing oh⁻ ions hence , it is an arrhenius base .

checking the options :

1) ch₃oh and naoh :

ch₃oh is known as methanol , an organic compound , which is neutral compound . the dissociation of ch₃oh is negligible . it is very very weak acid (ka = 3.2 * 10 ⁻¹² ) .

naoh being ionic gives na⁺ and oh⁻ ions in aqueous solution as :

naoh ↔ na⁺ + oh⁻ . hence it is an arrhenius base

it can be concluded that ch₃oh and naoh is not arrhenius acid and base.

2) hno₃ and naoh :

hno₃ is an ionic compound which gives ions h⁺ and no₃⁻ ion in aqueous solution as:

hno₃ + h₂o ↔ h₃o⁺ + no₃⁻

since it is giving h⁺ ion . hno₃ is arrhenius acid .

naoh being ionic gives na⁺ and oh⁻ ions in aqueous solution as :

naoh ↔ na⁺ + oh⁻

. hence it is an arrhenius base .

it can be said that hno₃ and naoh are arrhenius acid and base.

3) ch₃oh and hcl

as discussed ch₃oh is neutral compound .

while hcl in aqueous solution dissociates to give h⁺ and cl⁻ ions as :

hcl + h₂o→ h₃o⁺ + cl⁻ . so hcl is arrhenius acid .

hence , ch₃oh and hcl are not arrhenius acid and base.

4) hno₃ and hcl :

hno₃ as discussed gives h⁺ in aqueous solution , while hcl also gives h⁺ in aqueous solution .

hence both hno₃ and hcl are arrhenius acid they are not acid and base .

so the arrhenius acid and base are 2) hno₃ and naoh.

Answer from: Quest

Answerelement;

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THIS IS QUESTION AND ANSWER Jessa is a medical research assistant. She is examining antibodies unde...