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butalik [34]
2 years ago
12

1. Imagine that you need to take a medicine that the doctor has prescribed for

Chemistry
1 answer:
soldi70 [24.7K]2 years ago
3 0

Answer: Only non-polar medicines can diffuse across the membrane. non-polar drugs are lipid soluble, while polar drugs are water soluble, so polar drugs cant absorb through biological membranes.

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How many grams of F− must be added to a cylindrical water reservoir having a diameter of 2.02 × 102 m and a depth of 87.32 m?
aksik [14]

Complete Question:

To aid in the prevention of tooth decay, it is recommended that drinking water contain 0.800 ppm fluoride. How many grams of F− must be added to a cylindrical water reservoir having a diameter of 2.02 × 102 m and a depth of 87.32 m?

Answer:

2.23x10⁶ g

Explanation:

The concentration of the fluoride (F⁻) must be 0.800 ppm, which is 0.800 parts per million, so the water must have 0.800 g of F⁻/ 1000000 g of the solution. The density of the water at room temperature is 997 kg/m³ = 997x10³ g/m³. So, the concentration of the fluoride will be:

0.800 g of F⁻/ 1000000 g of the solution * 997x10³ g/m³

0.7976 g/m³

The volume of the reservoir is the volume of the cylinder: area of the base * depth. The base is a circumference, which has an area:

A = πR², where R is the radius = 1.01x10² m (half of the diameter)

A = π*(1.01x10²)²

A = 32047 m²

The volume is then:

V = 32047 * 87.32

V = 2.7983x10⁶ m³

The mass of the F⁻ is the concentration multiplied by the volume:

m = 0.7976 * 2.7983x10⁶

m = 2.23x10⁶ g

8 0
3 years ago
To what extent do covalent compounds conduct electricity?
sertanlavr [38]

The answer is never because there's no electricity

3 0
3 years ago
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Name the following compounds:
timama [110]
A) sodium fluoride
B) rubidium oxide
C) boron trichloride
D) dihydrogen selenide
E) tetraphosphate hexoxide
F) iodine trichloride
6 0
3 years ago
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Janet hikes a trail at a local forest each day. The trail is 3.6 miles long, and she hiked five days in the past week. How many
anastassius [24]
Should be 18, well i guess I have to have 20 characters so good luck
6 0
3 years ago
1. Is water an element ?
earnstyle [38]

Answer:

no

Explanation:

Water is made up of oxygen and hydrogen. both of those are on the periodic table. water is not an element though

hope this helps!

Please mark me brainliest!

3 0
3 years ago
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