C1

What are the three states of matter?

solid

liquid

gas

What is a solid?

the particles are arranged and close together

What is a liquid?

the particles are randomly arranged and close together

What is a gas?

the particles are randomly arranged and far apart

What is a chemical change?

what is created is chemically different to what is reacted

What is a physical change?

changing in state eg. melting

What is a limitations?

the attraction and spaces between particles

What did John Dalton do?

atoms make up all substances

What did Tomson do?

the plum pudding model

What did Rutherford do?

that atoms have a nucleus and the proton

What did Bohr do?

electrons are in shells

What is an atom?

negatively charged electrons surrounding a positive nucleus

What is smaller molecules or atoms?

atoms as they make up molecules

What is the relative charge and mass of a proton?

charge +1

mass 1

What is the relative charge and mass of a neutron?

charge 0

mass 1

What is the relative charge and mass of an electron?

charge -1

mass 1/1836

What is an atomic number?

number of protons (electrons)

What is an isotope?

an element with different neutrons but the same protons

What is the mass number?

protons + neutrons

What is an ion?

an atom with a charge

How do you find the number of protons?

the same as the atomic number

How do you find the number of neutrons?

mass number - atomic number

How do you find the number of electrons?

number of protons