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barxatty [35]
4 years ago
9

Why are covalent bonds between hydrogen and nitrogen or oxygen polar? see section 2.1 ( page 57) ?

Chemistry
1 answer:
Novay_Z [31]4 years ago
5 0
A covalent bond is on in which electron pairs are shared between one or more electron pairs between atoms. Polar covalent bonds are so called because the electron density is closer to one atom participating in the bond than to another. The tendency of electron density to be closer to one atom and not the other can be due to the geometry of the bond. 
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In a chemical change
Vsevolod [243]

Answer:

B. materials change their properties.

Explanation:

In a chemical change, materials often change their properties because a re-arrangement of atoms takes place.

A chemical change is one in which new kind of matter is formed.

It is always accompanied by energy changes.

  • Chemical changes are not reversible.
  • They lead to the production of new kinds of matter
  • It involves mass changes
  • Requires considerable amount of energy
8 0
3 years ago
The cloth shroud from around a mummy is found to have a 14C activity of 8.4 disintegrations per minute per gram of carbon as com
kondaur [170]

Answer:

48889 years

Explanation:

Activity of the living sample Ao= 15.2 disintegration per minute

Activity of the cloth A= 8.4 disintegration per minute

Half life of 14C= 5715 years

Time taken for the decay t= the unknown

From;

0.693/5715 = 2.303/t log (15.2/8.4)

1.213 × 10^-4 = 2.303/t log (1.8095)

1.213 × 10^-4 = 0.593/t

t= 0.593/1.213 × 10^-4

t= 4888.7 years

t= 48889 years

8 0
4 years ago
Which of the following will likely result in a misfolded protein (mark all that apply)?
Anna007 [38]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Below are the choice that should accompanied your question above:

<span>1) Mutation resulting in aberrant STOP codon 
2) Mutation in DNA sequence 
3) Mutation in splice site 
4) Mutation in promoter 

I think the answer should be 

</span>1) Mutation resulting in aberrant STOP codon 
2) Mutation in DNA sequence 
3 0
4 years ago
10. What is the atmospheric pressure if the partial pressures of nitrogen, oxygen, and
sashaice [31]

Answer:

1.009 atm is the total pressure for the mixture

Explanation:

To determine the total pressure in atm, of the three gases (N₂, O₂ and Ar) we have to sum all the values.

Sum of partial pressures in a mixture = Total pressure

First of all, we need to convert the values from mmHg to atm

604.5 mmHg . 1atm / 760 mmHg = 0.795 atm

162.8 mmHg . 1atm / 760 mmHg = 0.213 atm

0.500 mmHg . 1atm / 760 mmHg = 6.58×10⁻⁴ atm

Partial pressure N₂ + Partial pressure O₂ + Partial pressure Ar = Total P

0.795 atm + 0.213 atm + 6.58×10⁻⁴ atm = 1.009 atm

7 0
4 years ago
Stars which appear to revolve around Polaris and do not set (go below the horizon) are called:
Andrej [43]

Circumpolar stars

Explanation:

Stars which appears to revolve around the Polaris and do not set or go below the horizon are called circumpolar stars.

In short, this stars circles the pole.

  • Circumpolar stars are not found at the equator.
  • These stars do not set and they are visible at the north poles.
  • The simply stay as the earth spins on its axis.

Learn more:

Stars brainly.com/question/11007330

#learnwithBrainly

4 0
3 years ago
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