Answer
a. false
b. false
c. true
d. false
e. true
Work Step by Step
a. If it’s table sugar (sucrose) and nothing else is mixed in, it is a pure substance, not a mixture. The statement is FALSE.
b. This statement is FALSE. Pure substances can be either elements or compounds. Elements are made up of only one type of atom, whereas compounds are made up of two or more different types of atoms chemically bonded together.
c. This statement is TRUE. Air is composed of different gases like Oxygen, Nitrogen, Carbon dioxide and others, it is a mixture of gases.
d. This statement is FALSE. Gasoline is a complex mixture of hydrocarbons, with different chemical compounds present in different proportions.
e. This statement is TRUE. Compounds are made up of two or more different types of atoms chemically bonded together, breaking these bonds can only be achieved by chemical reactions.
