Organising matter science test revision

Three main parts of an atom

Proton, neutron and electron

Where are protons and neutrons found?

In the nucleus

Where are electrons found?

Outside the nucleus

atomic number

number of protons in an atom

atomic mass

number of protons and neutrons together

element

pure substance made of only one type of atom

compound

two or more elements chemically bonded togetherm

mixture

two or more pure substances mixed together

What does CO₂ mean?

one carbon atom and two oxygen atoms

molecule

group of atoms joined together

properties of metals

shiny, great conductors and malleable

properties of non metals

dull, brittle and poor conductors

pure substance

contains only one type of particle

independent variable

the variable you change

dependent variable

the variable you measure

controlled variable

variable that is kept the same throughout the entire experiment