What is the definition of matter?

Anything that has mass and takes up space.

Which of the following is not a characteristic of a pure substance? A) Fixed melting point B) Same kind of pieces C) Fixed boiling point D) Variable composition

D) Variable composition

Riddle: I am made of only one kind of atom and cannot be broken down into simpler substances. What am I?

An element

True or False: Mixtures have fixed melting and boiling points.

False. Mixtures do not have fixed melting or boiling points.

Fill in the blank: A ______ is a mixture of two or more substances that retain their individual properties.

Mixture

What distinguishes a homogeneous mixture from a heterogeneous mixture?

A homogeneous mixture has components that are evenly mixed, while a heterogeneous mixture has components that are not evenly mixed.

Which method can be used to separate a mixture based on size?

Sieving

Fill in the blank: The method of separating components of a mixture using a magnet is called ______.

Magnetic separation

Riddle: I separate components by letting heavier solids settle at the bottom of a liquid. What am I?

Sedimentation

What is the process called when one piece of a mixture does not dissolve in a solvent while another does?

Solvent extraction

Which of the following mixtures is an example of a heterogeneous mixture? A) Air B) Saltwater C) Oil and water D) Sugar in water

C) Oil and water

Fill in the blank: The clear liquid above the sediments after sedimentation is known as ______.

Supernatant

Riddle: I am used to separate colors from ink and I leave behind distinct spots. What am I?

Chromatography

What type of mixture can be separated by filtration?

A solid-liquid mixture.

True or False: Fractional distillation can separate liquids that have similar boiling points.

True.

What is an emulsion?

A mixture of two liquids that do not mix, forming tiny drops in each other.

True or False: A compound's features are usually the same as the elements it is made of.

False. A compound's features are very different from the elements it is made of.