Hydrocarbons and Alkanes Concepts

What is the primary source material for the formation of crude oil?

• Volcanic ash

• Ancient biomass, mainly plankton

• Sedimentary rocks

• Molten lava

What is crude oil chemically classified as?

• A pure element

• A mixture of compounds called hydrocarbons

• A single compound of carbon and oxygen

• A type of mineral

Which elements are exclusively found in compounds classified as hydrocarbons?

• Carbon, Oxygen, and Hydrogen

• Carbon and Nitrogen

• Hydrogen and Oxygen

• Carbon and Hydrogen

How many covalent bonds does a carbon atom always form when constructing hydrocarbons?

• Two

• Three

• Four

• Five

Which of the following is a defining characteristic of alkanes?

• They contain carbon-carbon double bonds.

• Their names always end in "-ene".

• Their carbon-carbon bonds are all single covalent bonds.

• They contain oxygen atoms.

What is the chemical formula for an alkane with 8 carbon atoms?

• C8H16

• C8H18

• C8H14

• C8H10

What is the name of the alkane with 8 carbon atoms?

• Heptane

• Octane

• Nonane

• Decane

What is the definition of a hydrocarbon?

• A mixture of compounds found in crude oil.

• Compounds made from hydrogen and carbon atoms only.

• Compounds with single covalent bonds between carbon atoms.

• A finite resource found in rocks.

Which two features must a hydrocarbon have to be classified as an alkane?

• All C-C bonds are single covalent bonds, and its formula abides by CnH2n+2.

• It contains only carbon and hydrogen atoms, and all C-C bonds are single covalent bonds.

• It is a finite resource, and its formula abides by CnH2n+2.

• It has at least one C=C double bond, and its formula abides by CnH2n.