chemistry dec test Flashcards
how can the speed of a reaction be changed
1-decreasing the parcticle size
2- increase the concentration
3- increase the tempature
rate of reaction formula
quantity/time. divide.
rate of reaction sentancse remember
The units of rate will depend on the measurements taken during the experiment e.g. cm3/s or g/min.
graphs rememebr
- the steeper the line the faster the reaction
- the reaction finishes when the line becomes horizontal
what are the perodic table groups
group 1 - Alkali metals Group 2- Alkaline earth metals Group 7- Halogens Group 8- noble gasses Transition metals are between group 2 and 3
what are the diatomic elements
bromine, oxygen,flourine, iodine, nitrogen, chlorine , hydrogen
BOFINCH
what is made of atoms
all matter is made of atoms
what is an ion
when the number of positive protons and negative electrons in a particle
what is an element
a stubstance that only contains one atom
what do atoms contain
protons, neutrons and electorns each with a specific charge, mass and position within atom
what do chemists use nuclide notation for
to show the numbers of sub atomic particles in an ion or atom
what is an atomic number
the number of protons in the nucleas
what are isotopes
atoms with the same atomic number but with diffrent mass
what is a mass number
the number of protons plus neutrons
why dont atoms have a electric charge
becasue they have the same number of positive protons and negative electrons
