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Sonja [21]
3 years ago
8

Which is a base unit used in the metric system?

Chemistry
1 answer:
DaniilM [7]3 years ago
4 0

Answer:

<h2> Quarts </h2><h2>Litres </h2><h2>Pints </h2><h2>Degrees Fahrenheit. </h2>

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The half-life of cesium-137 is 30 years. Suppose we have a 200-mg sample. (a) Find the mass that remains after t years.
scZoUnD [109]

Given:

Half life(t^ 1/2) :30 years

A0( initial mass of the substance): 200 mg.

Now we know that

A= A0/ [2 ^ (t/√t)]

Where A is the mass that remains after t years.

A0 is the initial mass

t is the time

t^1/2 is the half life

Substituting the given values in the above equation we get

A= [200/ 2^(t/30) ] mg


Thus the mass remaining after t years is [200/ 2^(t/30) ] mg

5 0
3 years ago
Suppose you are a member of your city planning board. A company wants to build a large shopping mall near a river in your area.
Flura [38]
A should be the answer.
8 0
3 years ago
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Calculate the concentration of hydrogen ions in a healthy person’s blood that has a pH of 6.40.
adoni [48]

Answer:

[H⁺] = 3.98×10⁻⁷ M

Explanation:

Given data:

pH of blood = 6.40

Hydrogen ion concentration = ?

Solution:

Formula:

pH = - log[H⁺]

by rearranging this formula,

[H⁺] =  10⁻(pH)

By putting values,

[H⁺] = 10 ⁻⁶°⁴⁰

[H⁺] = 3.98×10⁻⁷ M

4 0
3 years ago
The concentration of KBr in a solution prepared by dissolving 2.21g of KBr in 897 g of water is __________ m.
anyanavicka [17]

Answer:

E) 0.0207

Explanation:

The molal concentration, m, is defined as the ratio between moles of solute (In this case, KBr) per kg of solvent (water):

<em>Moles KBr -Molar mass: 119g/mol-</em>

2.21g KBr * (1mol / 119g) = 0.01857moles

<em>Mass solvent:</em>

897g * (1kg / 1000g) = 0.897kg

Molal concentration:

0.01857 moles / 0.897kg =

0.0207m

Right solution is:

<h3>E) 0.0207. </h3>

4 0
3 years ago
are there any chemical bonds or forces of attraction between a solid surface (such as a glass (SiO2) or a polypropen (C3H6) plat
Ymorist [56]

Answer:

Yes, there are forces of attraction between the surfaces.

It is adhesive force.

Explanation:

Adhesive force is the bonding between two or more molecules of different materials, causing them to stick together.

4 0
3 years ago
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