Question

which is a characteristic of mixtures? they can be classified as pure substances. they can be separated by physical processes. they have fixed ratios between their components. they are chemically bonded together.

Explanation:

• Option 1: Mixtures are combinations of substances, not pure substances, so this is incorrect.
• Option 2: Mixtures are made of substances physically combined, so physical processes (like filtration, distillation) can separate their components. This is a key characteristic.
• Option 3: Mixtures have variable ratios of components (unlike compounds), so this is incorrect.
• Option 4: Mixtures have components that are not chemically bonded (chemical bonding is for compounds), so this is incorrect.

Answer:

The correct option is: They can be separated by physical processes.