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babunello [35]
1 year ago
13

Which answer choices correctly describe properties of covalent compounds? Select all that apply.

Chemistry
2 answers:
Lana71 [14]1 year ago
7 0

Answer:

Explanation:

A covalent compound is made when two or more nonmetal atoms bond by sharing valence electrons. The shared valence electrons between two nonmetal atoms is called a covalent bond. Covalent bonds are formed when two atoms begin sharing electrons

Ann [662]1 year ago
3 0

Question:

Which answer choices correctly describe properties of covalent compounds?

Select all that apply.

The electrons in covalent compounds are less mobile than the electrons in ionic compounds.

Covalent compounds' bonds are weaker than ionic compounds' bonds when placed in water.

Electricity is easily conducted in covalent compounds.

Covalent compounds' bonds are not broken apart when placed in water.

<u>Answer</u>:

Two statements that describes are:  

  • The electrons in covalent compounds are less mobile than the electrons in ionic compounds.
  • Covalent compounds' bonds are not broken apart when placed in water.

<u>Explanation</u>:

Covalent compounds are non-metals that are bonded together. They are generally made up of two electrons which are shared by two atoms. These compounds are formed through sharing of electrons and ionic compounds are formed by transferring of electrons. Thus, electrons in the covalent compound are less mobile.

Covalent compounds break apart into molecules when dissolving in water because they are non-polar. Thus, when mixed in the water they don’t break apart rather form their own separate layer.

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<u>Answer:</u> The mass of carbon and hydrogen in the sample is 0.1087 g and 0.0066 g respectively and the percentage composition of carbon and hydrogen in the sample is 94.27 % and 5.72 % respectively.

<u>Explanation:</u>

The chemical equation for the combustion of hydrocarbon having carbon and hydrogen follows:

C_xH_y+O_2\rightarrow CO_2+H_2O

where, 'x' and 'y' are the subscripts of carbon and hydrogen respectively.

We are given:

Mass of CO_2=0.3986g

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We know that:

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  • <u>For calculating the mass of carbon:</u>

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 0.3986 g of carbon dioxide, \frac{12}{44}\times 0.3986=0.1087g of carbon will be contained.

  • <u>For calculating the mass of hydrogen:</u>

In 18g of water, 2 g of hydrogen is contained.

So, in 0.0578 g of water, \frac{2}{18}\times 0.0578=0.0066g of hydrogen will be contained.

To calculate the percentage composition of a substance in sample, we use the equation:

\%\text{ composition of substance}=\frac{\text{Mass of substance}}{\text{Mass of sample}}\times 100      ......(1)

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Mass of sample = 0.1153 g

Mass of carbon = 0.1087 g

Putting values in equation 1, we get:

\%\text{ composition of carbon}=\frac{0.1087g}{0.1153g}\times 100=94.27\%

  • <u>For Hydrogen:</u>

Mass of sample = 0.1153 g

Mass of hydrogen = 0.0066 g

Putting values in equation 1, we get:

\%\text{ composition of hydrogen}=\frac{0.0066g}{0.1153g}\times 100=5.72\%

Hence, the mass of carbon and hydrogen in the sample is 0.1087 g and 0.0066 g respectively and the percentage composition of carbon and hydrogen in the sample is 94.27 % and 5.72 % respectively.

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