Space and Separating Techniques MCQ

Explain the difference between pure and impure substances.

• Pure substances have a fixed composition, while impure substances have a variable composition.

• Pure substances can be separated into components by physical means, while impure substances cannot.

• Pure substances are always elements, while impure substances are always compounds.

• Pure substances have a variable composition, while impure substances have a fixed composition.

List the celestial bodies found in our solar system.

• Planets, moons, asteroids, comets, and the Sun

• Only planets and the Sun

• Only stars and galaxies

• Only moons and asteroids

Mixtures are defined as:

• A combination of two or more substances that are not chemically bonded.

• A single substance with a fixed composition.

• A chemical reaction between two elements.

• A pure element found in nature.

The solar system consists of the Sun and which of the following components?

• Only planets

• Planets and their moons

• Stars and galaxies

• Asteroids and comets

What are the methods used for separating mixtures?

• Filtration, distillation, and chromatography

• Boiling, freezing, and melting

• Combustion, oxidation, and reduction

• Photosynthesis, respiration, and transpiration

Chromatography is a process used for what purpose?

• Separating mixtures

• Combining substances

• Heating elements

• Cooling solutions

Complex mixtures are different from simple mixtures in that they:

• contain only one type of substance

• have components that are easily separated

• consist of multiple substances that are not easily separated

• are always homogeneous

Scientists interpret data in experiments by:

• analyzing patterns and trends

• ignoring unexpected results

• focusing only on positive outcomes

• relying solely on intuition

A student found two unlabelled bottles in a lab. They tested the chemicals inside and discovered the results below. (a) Label the chemicals above as pure or impure.

• Label the chemicals as pure or impure.

• Label the chemicals as acidic or basic.

• Label the chemicals as organic or inorganic.

• Label the chemicals as solid or liquid.

A student found two unlabelled bottles in a lab. They tested the chemicals inside and discovered the results below. (b) Define a pure substance.

• A pure substance is a material with a constant composition.

• A pure substance is a mixture of different elements.

• A pure substance is a material that can be separated into different components.

• A pure substance is a material that changes composition over time.