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3 years ago

13

You are counting red blood cells, which objective will be best to count the number of cells, high power or low power objective a

nd why?
Can someone please HELP MEEEE

1 answer:

BARSIC [14]3 years ago

4 0

Answer:

Low power

Explanation:

Low power would allow for the full image of the red blood cells and would appear as small circles.

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What are the effects on global food webs if the sun's energy could no longer reach Earth

gogolik [260]

They would collapse as the sun gives the producers energy to grow i.e plants through photosynthesis. Without plants most animals would die out unless humans could somehow create a food in labs without animals or plants for 6 billion people. Ultimately it would be the death of the human race and just about everything on Earth apart from some plants that live in the deep depths of the sea which have adapted to not having as much sunlight.

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3 years ago

1. Submit a detailed mechanism for the synthesis of benzopinacolone starting with benzophenone. 2. Draw the structure for the ph

makvit [3.9K]

Answer:

The first stage of this reaction involves the 2-propanol reacting with benzophenone which involves the formation of the most stable carbocation, the reaction is then heated under high temperature and pressure to form benzopinacol, on cooling the benzopinacololone crystallizes out

Melting point of benzopinacolol= 184-186°C

Explanation:

Please find attached the detailed step by step mechanism of synthesis of benzopinacololone

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4 years ago

The law of unbalanced forces is also known as? :

diamong [38]

Answer:

Newton's 2nd Law

Explanation:

Newton's Second Law of Motion is concerned with the effect that unbalanced forces have on motion.

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3 years ago

Read 2 more answers

In chemistry the term molecule was in introduced by

AURORKA [14]

Answer:

Avogadro

Explanation:

Molecule: The term molecule was introduced by Avogadro. Molecule is the smallest particle of matter that exists independently and is formed by the combination of atoms. Molecule is also defined as the smallest particle of matter that can exist and retains all the properties of that substance. Was this answer helpful?

plss mark me bainlest

3 0

3 years ago

Just enough 0.500 M HCl is added to 30.0 mL of 2.5 M NH3 to reach the equivalence point. The Kb of NH3 = 1.8 X 10-5

algol13

a.NH₃+HCl⇒NH₄Cl

b.volume HCl=150 ml

c. pH=4.82

<h3>Further explanation</h3>

Reaction

NH₃+HCl⇒NH₄Cl

The equivalence point⇒mol NH₃=HCl

Titration formula :

M₁V₁n₁=M₂V₂n₂(n=acid base valence, NH₃=HCl=1)

mol NH₃

$\tt 2.5\times 30=75~mlmol$

mol HCl=75 mlmol

Volume HCl :

$\tt \dfrac{75}{0.5}=150~ml$

Volume total :

$\tt 150+30=180~ml$

molarity of salt(NH₄Cl)

mol NH₄Cl=mol NH₃=75 mlmol=0.075 mol

$\tt M=\dfrac{0.075}{0.180}= 0.42$

pH of solution

Dissociation of NH₄Cl at water to find [H₃O⁺]

$\tt NH_4+H_2O\rightarrow NH_3+H_3O^+$

ICE at equilibrium :

0.41-x x x

Ka(Kw:Kb)= 10⁻¹⁴ : 1.8.10⁻⁵=5.6.10⁻¹⁰

$\tt Ka=\dfrac{NH_3.H_3O}{NH_4}=\dfrac{x^2}{0.41}$

[H₃O⁺]=x :

$\tt \sqrt{5.6.10^{-10}\times 0.41}=1.515.10^{-5}$

pH=-log[H₃O⁺]

$\tt pH=5-log~1.515=4.82$

7 0

3 years ago