Lesson 2 - Mixtures

Question 1

Pure Substances

Answer 1

They cannot be changed and are the same in all parts of the substance.

Question 2

can compounds be pure

Answer 2

Compounds can also be pure. This means they are only made up of the particular elements that make that compound.

Question 3

features of a pure substance

Answer 3

A pure substance has the same fixed components in all its parts, so it cannot be separated into other substances using physical methods i.e. filtering.

Question 4

Mixtures

Answer 4

A mixture contains elements and/or compounds that are not chemically joined together.
You can use physical processes to separate them into different substances

Question 5

difference between PURE SUBSTANCE

and MIXTURE

Answer 5

pure substances have a ‘sharp’ melting point, Made up of the same atoms throughout and pure mixtures can be separated by physical processes, will melt over a range of temperatures