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2 years ago

Carbon forms a great variety of stable compounds. Which of the following is not a reason for this variety?

Chemistry

1 answer:

katen-ka-za [31]2 years ago

4 0

Answer:

Explanation:

Carbon atoms are not strongly electronegative and tend to form covalent bonds.

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Air pressure is lower at high altitudes. An airplane cabin can adjust, but as the plane rises, passengers can experience tempora

-BARSIC- [3]

Answer:

The air pressure in the ears increases

The volume of air in the ears increases

The change in volume causes discomfort

It takes time for the ears to dispell excess air past the ear drum.

Explanation:

As the plane engages in a steep incline into the atmosphere, the outside atmospheric pressure decreases with altitude. The air pressure in the ear, therefore, become greater than atmospheric pressure. The air volume in the ear therefore grows and pushes on the ear causing discomfort. As the air in the cabin pressurizes the discomfort eases away as pressure equalization is restored relative to the ear.

4 0

3 years ago

Read 2 more answers

An object with a mass of 20.0 kg has a force of 5.0 Newton's applied to it. What is the resulting acceleration of the object?

Gnom [1K]

Love the toradora pfp, also the answer to your question is...

answer: from newtons second law of motion,
F=ma hence,
F=20N
m=5kg so,
20=5×a
a=4m/s^2

7 0

2 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

2 years ago

How does a fire extinguisher works ?

Usimov [2.4K]

Answer:

Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out. Some ways of using fire extinguisher are:

 Water extinguishers work mainly by cooling (removing heat), but a dense spray of water droplets also helps to cut off oxygen.

 Dry powder extinguishers soak up heat, melt on the fuel, and cut off oxygen, but they also neutralize the fuel (cutting it off from the fire) .

Explanation:

I hope it was helpful...

8 0

1 year ago

After 184.5 years, onky 0.625 grams of an original 20 gram sample of a radioactive isotope is left. Find the half life

kakasveta [241]

Answer:

half-life=T= 36.9 years

Explanation:

As we know that

N ( t ) = N ( 0 ) ⋅ 0.5 ^(t/ T )

N ( 0 ) =the number of atoms you start with=20 gram

and N ( t )= the number of atoms left=0.625 grams

after a certain time=t=184.5 years

T=half life of a nuclide=?

Putting value in above equation we get

half-life=T= 36.9 years

8 0

2 years ago