Atomic structure

118

21%

A compound is a chemical substance made up of 2 or more elements that are chemically joined together

• compounds are broken or formed • at least 1 new substance is created -measurable energy change -no atoms are created or destroyed

-the chemicals that are reacting with each other

the chemicals being made

because atoms cannot be created or destroyed

symbol equations and word equations

consists of two or more elements or compounds not chemically combined together

evaporation filtration chromotography fractional distillation simple distillation

separates components from a mixture

Filtration separates mixtures that contain insoluble (can’t dissolve) solids and liquids (which are soluble).

Filtration is performed by pouring the mixture through filter paper: The insoluble solid is trapped by the filter paper. The liquid runs through the filter paper and is collected below.

separates alot of liquids with different boiling points

separates a solid from a liquid whilst keeping the liquid

0.1 nanometres

1x10^-14 m

• in the middle of the atom • contains protons and neutrons • overall positive charge because of the protons • where most of the atoms mass is concentrated

• move around the nucleus in electron shells • negatively charged and tiny, but cover a lot of space • the volume of their orbits determine the size of the atom • have basically no mass–

at the top

at the bottom of the element

a substance that consists of atoms with the same atomic number

different forms of the same element, which have the same number of protons but different number of neutrons

the average mass, taking into account the different masses and abundances of all the isotopes that make up the element