Matter Flashcards
Define chemistry
Is the study of elements and their properties
What is a periodic table
It is an orderly arrangement of elements according to their atomic numbers
Name the 3 categories of the periodic table
Metals
Semi metals
Non metals
What are the horizontal lines on the periodic table
These are called groups
What are the vertical lines called
They are called periods
Fact about metal
It is good conductor of heat
2 types of metals liquid at room temperature
Mercury and gallium
What is an atom mead up of
Sub atomic particles protons electrons and neutrons
Describe sub atomic particles
Proton | posetive | 1 a.m u|nuclus
Electron| negative|negiable|shells
Neutron| neutral| 1.a.m.u | nucleus
Define matter
Any substance that has a mass and occupies volume
Atoms
The smallest particles of matter
Define pure substances and list 2 types
Are those which has one type of atom or molecules
They include•compound and elements
Who developed the periodic table
Dimitri mendeleev in 1860 he was a Russian chemist
Define compound
Is made up of two or more different elements combined together chemically
Define molecule
Two or more atoms joined together chemically
What stays the same in a compound
The ratio
Name and explain two types of methods to break down compounds
Electrolysis
Breaking down a compound using electricity
Thermal decomposition
Breaking down a compound using heat
What are mixtures
Two or more substances combined together and can be separated by physical means
Two types of mixtures
Homogenous
Hetergenous
3 states in which matter exists
Solid
Liquid
Gas
What are solids, liquids , gas made up of
Particles called atoms or molecules
Why do some substances float on other substances
Substances with less density float
Why is water different
Solid Water consists of air bubbles
What happens to the volume and density I temperature increase
The volume increase whilst the density decreases
The opposite happens if temperature decreases
