Module 2 key information Flashcards
What is the relative mass of a proton, neutron and electron?
Proton= + 1 neutron= 1 electron= 1/1836
What is the charge of a proton, neutron and electron?
Proton= +1 neutron = 0 electron= -1
What is an isotope?
Atoms of the same element with different numbers of neutrons but the same number of protons.
So the same atomic number but a different mass number.
Do isotopes have the same properties?
They have similar chemical properties because of the same electronic configuration
They have slightly different physical properties because of the different masses
What is relative isotopic mass?
The mass of an isotope relative to 1/12th of the mass of an atom on carbon-12
What is relative atomic mass?
The weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12
What is relative molecular mass?
(Mr)= the sum of all atomic masses in the molecule
Used for simple molecules
What is relative formula mass?
sum of all atomic masses in the molecule
Used for compounds with giant structures
How to complete mass spec?
the sample is vaporized, ionised, accelerated, deflected, detected
What is mass spec used to find out?
relative isotopic masses and abundance
What is the nitrate ion?
NO3-
What is the sulphate ion?
SO4(2-)
What is the carbonate ion?
CO3(2-)
What is the hydroxide ion?
OH-
What is the ammonium ion?
NH4(+)
What is the zinc ion?
Zn2+
What is the silver ion?
Ag+
What is the charge on a tin or lead ion?
+2
How to balance a chemical equation?
1) balance metals
2) balance non-metals except oxygen and hydrogen
3) balance oxygen and hydrogen
What are the units for molar mass?
g mol-1
How to convert cm3 to dm3?
divide by 1000
How many cm3 is 1ml?
1cm3=1ml
How to convert cm3 to m3?
divide by 1000 then divide by 1000 again
What is the empirical formula?
The simplest whole-number ratio