Question

One of the components contained in gasoline is octane (C8H18). Which statement best describes C8H18?AIt is a mixture containing a combination of the properties of hydrogen and carbon.BIt is a pure substance containing a combination of the properties of hydrogen and carbon.CIt is a mixture containing properties different from those of hydrogen and carbon.DIt is a pure substance containing properties different from those of hydrogen and carbon.

Answer 1

Octane (C8H18) is a pure substance containing a combination of the properties of hydrogen and carbon.

Step-by-step explanation:

The molecule C8H18 is octane, which is a component of gasoline. Octane is an organic compound and belongs to the group of hydrocarbons. It is an example of an alkane, a type of hydrocarbon with single covalent bonds between carbon atoms and hydrogen atoms.

Octane has 8 carbon atoms and 18 hydrogen atoms. Its molecular formula, C8H18, shows the number of atoms of each element in the molecule. In the molecular formula, the carbon atoms are represented by the symbol C, and the hydrogen atoms are represented by the symbol H.

Therefore, the statement that best describes C8H18 is: It is a pure substance containing a combination of the properties of hydrogen and carbon.

Answer 2

We first define what is a pure substance and what is a mixture. A pure substance is a compound that cannot be broken down unless a chemical reaction occurs. A mixture can be made up of different pure substances that are separated by a physical process without the need for a chemical reaction.

In this sense, gasoline is a mixture and octane is a pure substance. Since we are asked about the octane, we can discard the answers that tell us that it is a mixture.

Now, when a pure substance is formed by a chemical reaction, the substance that is formed has properties that are not equivalent to the properties of the atoms that form it. In other words, this new substance acquires its own characteristics, so the octane made up of hydrogen and carbon will not have the properties of these atoms, they will have different properties.

Therefore, the answer will be:

C It is a mixture containing properties different from those of hydrogen and carbon.