Question

1. choose the best answer.

the smallest unit of an element that maintains all of the chemical properties of that element is a(n)

atom
compound
molecule
mixture

1. choose the best answer.

glucose contains both carbon and hydrogen. glucose is a(n)
compound.

organic
intensive
inorganic
extensive

Explanation:

• For question 18: An atom is the smallest unit of an element that retains its chemical properties. A compound is made of two or more elements, a molecule can be of an element (e.g., \(O_2\)) or a compound, and a mixture is a combination of substances.
• For question 19: Organic compounds contain carbon (except some like \(CO_2\)). Glucose (\(C_6H_{12}O_6\)) has carbon, so it is organic. Intensive and extensive are properties (like density - intensive, mass - extensive), and inorganic compounds generally don't have carbon (in the context of this classification for basic chemistry).

Answer:

1. atom
2. organic