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3 years ago

Which statement about hydrogen bonds is true?

Chemistry

2 answers:

daser333 [38]3 years ago

8 0

Explanation:

Hydrogen bond is a type of intermolecular chemical bond formed between two molecules. It is classified as a special dipole-dipole attraction between polar molecules in which a hydrogen atoms is directly joined to a highly electronegative atom.

A hydrogen nucleus has a high concentration of positive charges.
A hydrogen bond is actually an electrostatic attraction between the hydrogen atom (nucleus of one molecule and the electronegative atom, O or N or F) of a neighboring molecule.
The strength of the bond depends on the relative electronegativity of the atom directly joined to the hydrogen.
Hydrogen bonding forces is reflected in the physical properties of compounds such as water and ammonia.

3241004551 [841]3 years ago

4 0

Answer:

lol whatever they said. answers D, they help water striders walk on water by making surface tension

Explanation:

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What is the symbol of the new atom? Also, is the atomic number 86?

katrin [286]

Answer:

Explanation:

Rn is the symbol for radon with the atomic number of 86

7 0

3 years ago

Nitrogen effuses through a pinhole 1.7 times as fast as another gaseous element under the same conditions. Estimate the other el

marysya [2.9K]

Answer:

80.92, Krypton

Explanation:

What is effusion?

• It is a process where gas escapes through a pinhole (a very small hole) into a region of low pressure or vacuum

Graham's law of effusion of gas

• states that at a given constant temperature and pressure, the rate of effusion of gases is inversely proportional to the square root of their molar masses

$\boxed{ \frac{Rate_1}{Rate_2} = \sqrt{ \frac{M_2}{M_1} } }$

Calculations

Nitrogen exist as N₂ at room temperature, thus its molar mass is 2(14)= 28.

Let the rate and molar mass of unknown gas be Rate₂ and M₂ respectively.

Since N₂ effuses 1.7 times as fast as the unknown gas,

Rate₁= 1.7(Rate₂)

$\frac{Rate_1}{Rate_2} = 1.7$

$1. 7 = \sqrt{ \frac{M_2}{28} }$

Square both sides:

$2.89 = \frac{M_2}{28}$

Multiply both sides by 28:

2.89(28)= M₂

M₂= 80.92

Identity of gas

The molar mass of 80.92 lies between Bromine and Krypton. However since Bromine exist as Br₂, the value of it's molar mass would be 159.8 instead. Hence, Bromine is eliminated.

If the gas is a diatomic element, the atomic weight is 80.92 ÷2= 40.46. Thus, we are now considering if Argon could be its identity. However, Argon is a noble gas and will not exist as a diatomic element. Argon is therefore eliminated too.

Thus based on the above reasoning, its probable identity is Krypton.

7 0

3 years ago

Why is observational evidence important in an experiment?

irga5000 [103]

Answer:

Observational evidence is essential for investigating the way disease affects populations, the patterns and distribution of risk within them, and the emergence of trends in health and disease over time.

7 0

3 years ago

Read 2 more answers

Determine the change in volume that takes place when a 3.25-L sample of N2(g) is heated from 250.0 K to 406.8 K. Enter your answ

alexgriva [62]

Answer: The change in volume is 2.05 L

Explanation:

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=3.25L\\T_1=250.0K\\V_2=?\\T_2=406.8K$

Putting values in above equation, we get:

$\frac{3.25L}{250.0K}=\frac{V_2}{406.8K}\\\\V_2=5.30L$

Change in volume = $V_2-V_1=(5.30-3.25)L=2.05L$

Hence, the change in volume is 2.05 L

3 0

3 years ago

What is a chemial property og hydragion peroxide

AlladinOne [14]

Answer:

Hydrogen peroxide is a colorless liquid at room temperature with a bitter taste. Small amounts of gaseous hydrogen peroxide occur naturally in the air. Hydrogen peroxide is unstable, decomposing readily to oxygen and water with release of heat.

Explanation:

mark brainliest

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3 years ago