AQA unit 1 chemistry Flashcards
(25 cards)
what is an element
a substance made of one type of atom
what is a compound
a substance made of two or more types of atom chemically bonded together
what is a mixture
two or more elements and compounds not chemically bonded together
is oxygen an element, compound or mixture
an element
is carbon dioxide an element, compound or a mixture
a compound
is air an element, compounds or a mixture
a mixture
how many carbon atoms are in CO2
there is one atom
how many chlorine atoms are in Al3Cl6
six chlorine atoms
how many different elements are in C6H12O6
three different elements(carbon. Hydrogen and oxygen)
what is the centre of an atom called
the nucleus
what are three subatomic particles in an atom
protons, electrons and neutrons
where are protons and neutrons located in the atom
in the nucleus
where are electrons located
in the shells (energy levels)
what is the charge of a neutron
zero
what is the mass of a proton, electron and neutron
HINT-pen101
1,0,1
how many electons can you put in the first 3 shells
2,8,8
who came up with the plumb pudding model
JJ Thompson
who said that the atom had a dense nucleus with electrons in orbit
rutherford
who said the electrons were in the shells
niels bohr
who discovered the neutron
james chadwick
what are the elements in group 1 called in the periodic table
alkali metals
what are the elements on group 7 called
halogens
what are the elements in group 0 called
noble gases
why are the noble gases( group 0) unreactive
they all have a full outer shell
