Question

question 4
1 pts
the students compared the models of a table sugar molecule and a water
molecule.
how do table sugar molecules differ from water molecules?
table sugar molecules may repeat to form extended structures.
a table sugar molecule is a mixture.
a water molecule is a pure substance.
water molecules may repeat to form extended structures.

Explanation:

• Table sugar is a carbohydrate (sucrose, \(C_{12}H_{22}O_{11}\)) and can form extended structures (like in sugar crystals) through intermolecular forces.
• A molecule is a pure substance, not a mixture. So, the option “A table sugar molecule is a mixture” is wrong.
• Both water (\(H_2O\)) and table sugar are pure substances. So, the option “A water molecule is a pure substance” does not highlight the difference.
• Water molecules do not form extended structures in the same complex, repeating way as table - sugar (sucrose) molecules do in their solid (crystalline) form.

Answer:

Table sugar molecules may repeat to form extended structures.