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scZoUnD [109]
2 years ago
15

Which definition bests describes an hydrogen bond? 

Chemistry
1 answer:
sashaice [31]2 years ago
3 0
I believe that A is the answer
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What substance has a melting point of 0 and a boiling point of 100
tiny-mole [99]

Answer:

Water

Explanation:

Water molecules are known to have a melting point of 0°C and a boiling point of 100°C.

The melting and boiling points are as a result of the intermolecular force of attraction between the molecules of water. The predominant bond type that dictates the property of the melting and boiling point is the hydrogen bonding. This bond is a strong force of attraction and it impacts on the physical properties of water.

7 0
3 years ago
Read 2 more answers
A certain element exists as two different isotopes. 76.00% of its atoms have a mass of 35.00 amu and 24.00% of its atoms have a
ivanzaharov [21]

Answer:

35.48 uma

Explanation:

An isotope is when an element has equal numbers of protons but different mass value because it has different amount of neutrons.

To calculate the average atomic mass with the given data:

First change de percentages to fractional numbers, divide by 100.

Remember the sum of a percentage is equal to 100, but when you are adding the fractions the sum is equal to 1.

76/100 = 0.76

24/100 = 0.24

  %       fraction

76.00 0.76

24.00 0.24

total100.00 1.00

Now, multiply the mass with their corresponding fraction:

35(0.76) = 26.60

37(0.24) =  8.88

%      fraction amu amu

76.00 0.76 35         26.60

24.00 0.24 37         8.88

total100.00 1.00    average 35.48

Now you add the calculated mass to obtain the average atomic mass of the element.

And the value you will get is 35.48 amu.

I included an excel table so you can review it, I like to organize all the given data and the calculation in tables, also I think is easier to understand.

Download xlsx
7 0
3 years ago
Neon is an inert gas and has the atomic number of 10. Which of the following correctly depicts its electron configuration? 1s22d
weeeeeb [17]
I think the answer is 1s²2s²2p⁶.  Since neon has an atomic number of 10, we know that it needs to have 10 electrons and since it is in the second row it cannot have any d electrons which makes the first option incorrect.  The second option is incorrect because the 2s⁴ can't exist since s orbitals can only hold 2 electrons.  The fourth option cannot be right because it again neon cannot have d electrons due to it being in the second row.

I hope this helps.  Let me know if anything is unclear.
7 0
3 years ago
A bike tire reads a pressure of 13.2 psi. What is the
BaLLatris [955]

Answer:

0.89821 atm

Explanation:

Psi and atm are units of pressure.

Psi stands for pound force per square inch.

While atm stands for atmosphere.

In order to convert the psi to atm we would divide the given value 14.696.

Given value = 13.2 psi

In atm:

13.2 / 14.696 = 0.89821 atm

7 0
3 years ago
Read the following story and then answer the questions.
Sliva [168]
Place both breaking in a freezer at a temperature
4 0
3 years ago
Read 2 more answers
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