random flashcards i can't remember topic
potable water
water that is safe to drink
how does the temp of the surroundings change in exothermic reactions
increase
how does the temp of the surroundings change in endothermic reactions
decrease
waste water
water that has been used eg. rainwater, flushing toilet, usually ends up in rivers
exothermic processes
oxidation
combustion
neutralisation
endothermic processes
thermal decomposition
sodium hydrogen carbonate+citric acid
how is waste water treated?
screening - removes large particles and grit.
this creates sludge with is treated with anaerobic digestion + turned into fertiliser.
and effluent which is treated with aerobic digestion + goes into rivers.
where are protons found in atoms
nucleus
what charge do protons have
positive
what is peer review
when research is checked by other scientists to check for errors or mistakes
how are ions formed
when atoms lose or gain electrons
why do atoms form ions
to gain a full outer shell of electrons
what group are noble gases found in
group 8 / 0
relative mass of protons
1
relative charge of protons
+1
relative mass of neutron
1
relative charge of neutron
0
relative mass of electron
0
relative charge of electron
-1
how do you find the protons, electrons and neutrons on the periodic table
16 <— 16 - 8 = 8 neutrons
O
8 <— 8 protons, 8 electrons
what ions do acids release in water
hydrogen
formula of nitric acid
HNO3
which element relights a glowing splint in a experiment
oxygen
which element burns with a squeaky pop in an experiment
hydrogen
which element turns lime water murky in an experiment
carbon dioxide
which element bleaches damp litmus paper, turning it white
chlorine
what charge are atoms
positive
neutral
negative
neutral
ionic bonds=
metal + non metal
covalent bonds=
non metal + non metal
metallic bonds=
metal + metal
does a giant covalent lattice have covalent bonds or weak intermolecular bonds
covalent bonds
does a giant ionic lattice have covalent bonds or weak intermolecular bonds
covalent bonds
does a giant metallic lattice have covalent bonds or weak intermolecular bonds
covalent bonds
does a simple covalent structure have covalent bonds or weak intermolecular bonds
weak intermolecular bonds
examples of giant covalent lattice
D______
________
________
diamond
graphite
graphine
examples of simple covalent structure
w____
______ _______
water
carbon dioxide
what is CH4
methane
what is C2H6
ethane
what is C3H8
propane
what is C4H10
butane
formula for methane
CH4
formula for ethane
C2H6
formula for propane
C3H8
formula for butane
C4H10
methane structure diagram
’ H
l
H ~~ C ~~ H
l
H
ethane structure diagram
’ H H
l l
H ~~ C ~~ C ~~ H
l l
H H
propane structure diagram
’ H H H
l l l
H ~~ C ~~ C ~~ C ~~ H
l l l
H H H
butane structure diagram
’ H H H H
l l l l
H ~~ C ~~ C ~~ C ~~ C ~~ H
l l l l
H H H H
