Revision notes for C4 C5 C6, OCR 21c Triple Science

Revision notes for C4 C5 C6, OCR 21c Triple Science

HideShow resource information
Preview of Revision notes for C4 C5 C6, OCR 21c Triple Science

First 325 words of the document:

Chemistry C4 C5 C6
An element is made of only one kind of atom
Group = vertical, group number corresponds to the number of electrons in most
outer shell
Period = horizontal, corresponds to number of shells in atom
Atomic number = number of protons / electrons
RAM ­ AM = Neutrons
Nucleus is made of protons(+) and neutrons(/)
Nucleus surrounded by electrons() in shells
An atom has no overall charge
Line spectrum = light emitted from flame of an element when heated
Used to analyse unknown substances and discover new elements
Lithium ­ Red
Sodium ­ Yellow
Potassium ­ Lilac
Group 1 ­ Alkali metals
Reactivity increases as you go down group 1
Boiling / melting points decrease as you go down group 1
Group 7 ­ Halogens
Reactivity decreases as you go down group 7
Boiling / melting points increase as you go down group 7
A more reactive halogen will displace a less reactive halogen
Ions = atoms that have gained or lost electrons so have an overall charge
Ionic bonding = transfer of electrons between atoms and non metal atoms
Atom loses electrons = Positively charged ion
Atom gains electrons = Negatively charged ion
Ionic compound = compounds of Group 1 and Group 7 elements. Forms crystals as
ions are arranged in regular lattice
When crystals melt or dissolve in water they conduct electricity
Atmosphere ­ layer of gas surrounding the Earth (Nitrogen, Oxygen, Argon, Carbon
Dioxide
Hydrosphere ­ Mostly water and some dissolved compounds
Biosphere ­ All living things (Carbohydrates, DNA, Proteins)
Lithosphere ­ Rigid outer layer of the Earth (Aluminium, silicon, oxygen)
Electrolysis = breaking down of an electrolyte using an electric current. Used to
extract metals from their ores
Positive ions > Negative electrode
Negative ions > Positive electrode
Metals are strong, malleable, have high melting points and conduct electricity
Acids > PH less than 7
Neutral > PH 7

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Alkali > PH greater than 7
Acid + Metal hydroxide > Salt + Water
Acid + Metal oxide > Salt + Water
Acid + Metal carbonate > Salt + Water + Carbon dioxide
Acid + Metal > Salt + Hydrogen
Reactants = substances present before chemical reactions take place
Products = New substances made at the end of chemical reactions
Relative formula mass = Relative atomic mass of all elements added together
Yield = amount of product obtained from a chemical reaction
Titration ­ calculates…read more

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »