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Phoenix [80]
2 years ago
8

Which one of these is an example of a virus that can affect a range of hosts? A) the varicella virus B) the rabies virus C) the

rhinovirus D) the rubella virus
Chemistry
1 answer:
Sedaia [141]2 years ago
5 0

Answer:

B) the rabies viru

Explanation:

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An aqueous solution containing 10 g of an optically pure compound was diluted to 500 mL with water and was found to have a speci
7nadin3 [17]

Answer:

Specific rotation = -258°

Optical purity = 200%

Explanation:

Substances that have a chiral carbon ( a carbon which has four different atoms or compounds bond to it) have optical isomers. The different molecules are called enantiomers, and they differ by the side they deflect polarised light. A mixture contained the same number of the enantiomers is not optical and doesn't deflect polarized light. It's called a racemic mixture.

The specific rotation (spec.rot.) can be calculated by the equation:

spec.rot. = α/lc

Where α is the observed rotation of the plane polarised light in degrees, l is the path length in decimeters, and c is the concentration of the solution in g/100 mL.

The initial concentration is 10g/500mL = 2g/100 mL. The racemic mixture doesn't change the specific rotation, so the final concentration is 10g/1000 mL = 1g/100 mL. Then:

\frac{spec.rot.1}{spec.rot.2} = \frac{\frac{α}{lc1} }{\frac{α}{lc2} }

with α and l the same:

spec.rot.1/spec.rot.2 = c2/c1

spec.rot.2 = c1xspec.rot.1/c2

spec.rot.2 = 2x(-129°)/1

spec.rot.2 = -258°

If for a -129° the optical purity was 100%:

-129° ---------- 100%

-258° --------- x

By a direct simple three rule:

129x = 25800

x = 200%

7 0
3 years ago
Balance each of the following equations by placing coefficients in front of the formulas as needed MgO(s) Mg(s) + 02(8) ZnCI.(ag
777dan777 [17]

Is the equation wrong. Such a equation cannot be formed. pls enter the write equation i will help you

8 0
3 years ago
I need this answer before 7 can anyone help me please!
Alekssandra [29.7K]

Answer:

In asthma, cells are deprived of oxygen hence leading in incomplete respiration, and less energy.

In diabetes, there's not enough insulin

Explanation:

6 0
3 years ago
Read 2 more answers
This is the chemical formula for carvone (the chemical that gives spearmint its flavor): An organic chemist has determined by me
xz_007 [3.2K]

The given question is incomplete. The complete question is :

This is the chemical formula for carvone (the chemical that gives spearmint its flavor) C_{10}H_{14}O: An organic chemist has determined by measurements that there are 27.3 moles of carbon in a sample of carvone. How many moles of oxygen are in the sample

Answer: 2.73 moles of oxygen are there in the sample.

Explanation:

The chemical formula of carvone is C_{10}H_{14}O.

This means:

When 10 moles of carbon are there in carvone , 1 mole of oxygen is there in carvone

Thus for 27.3 moles of carbon in carvone , \frac{1}{10}\times 27.3=2.73 mole of oxygen is there in carvone.

Thus 2.73 moles of oxygen are there in the sample.

6 0
3 years ago
How many mL of 1.50 M hydrochloric acid will neutralize 25 mL of 2.00 sodium hydroxide?​
Lostsunrise [7]

Answer: The Answer is 18.7ml.

Explanation: Solved in the attached picture.

5 0
3 years ago
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