pure substances and mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.

Front

What is the difference between homogeneous and heterogeneous mixtures?

Back

Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures have distinct, separate components (e.g., salad).

Front

What method would you use to separate a mixture of sand and iron filings?

Back

You would use a bar magnet to attract the iron filings away from the sand.

Front

What is distillation?

Back

Distillation is a separation technique that relies on differences in boiling points to separate components of a mixture.

Front

What is an example of a heterogeneous mixture?

Back

Fruit Loops, pizza, and Skittles are examples of heterogeneous mixtures.

Front

What is filtration?

Back

Filtration is a process used to separate solids from liquids or gases using a filter medium that allows only the fluid to pass through.

Front

What is the role of a centrifuge in separating mixtures?

Back

A centrifuge uses rapid spinning to separate components of a mixture based on their density.

Front

What is chromatography?

Back

Chromatography is a technique used to separate and analyze the components of a mixture based on their movement through a stationary phase.

Front

What is the significance of boiling points in separation techniques?

Back

Boiling points are significant in separation techniques like distillation, where components are separated based on their different boiling points.