Science Chemistry Physical Chemistry basicss

the basics

What is a mixture?

A substance made of two or more different kinds of matter.

What is a pure substance?

A substance made up of only one kind of matter.

What is the difference between a homogeneous and a heterogeneous mixture?

Homogeneous: Same throughout (e.g., salt water)

Heterogeneous: Different parts are visible (e.g., salad)

What is an element?

A pure substance that cannot be broken down into simpler substances.

What is a compound?

A pure substance made from two or more elements chemically combined.

What are physical properties?

Characteristics that can be observed or measured without changing the substance.

Give examples of physical properties.

Colour, texture, density, melting point, boiling point.

What is a pure substance?

A substance made up of only one kind of matter.

What is a mixture?

A substance made of two or more different kinds of matter.

What is the difference between a homogeneous and a heterogeneous mixture?

Homogeneous: Same throughout (e.g., salt water)

Heterogeneous: Different parts are visible (e.g., salad)

What is an element?

A pure substance that cannot be broken down into simpler substances.

What is a compound?

A pure substance made from two or more elements chemically combined.

What are physical properties?

Characteristics that can be observed or measured without changing the substance.

Give examples of physical properties.

Colour, texture, density, melting point, boiling point.