additional Flashcards
(15 cards)
Define relative isotopic mass
mass compared with 1/12th mass of carbon-12
Define relative atomic mass
weighted mean mass
compared with 1/12th mass of carbon-12
How do we work out isotopic masses?
Mass spectroscopy
If a bond has a larger enthalpy, is it stronger or weaker?
Stronger
Properties of water?
- More dense than ice
- Relatively high melting and boiling point
How is periodic table arranged
-Increasing atomic number
-Periods show repeating trends
-Groups have similar chemical properties
What is Ca(OH)2 used for?
Neutralise soils
What are Mg(OH)2 and CaCO3 used for
Antacids- treat indigestion
How is bleach made?
Chlorine + Cold, dilute NaOH
Enthalpy change of formation?
Enthalpy change that occurs when one mole of compound is formed from its constituent elements standard conditions
Enthalpy change of combustion?
Enthalpy change that occurs when one mole of substance is completely combusted
Enthalpy change of neutralisation?
enthalpy chanhe that occurs when one mole of water is formed in a neutralisation reaction
What is average bond enthalpy?
the breaking of 1 mol of bonds in gaseous molecules
What is meant by a dynamic equilibrium?
in a closed system when the rate of the forward
reaction is equal to the rate of the reverse
reaction and the concentrations of reactants and
products do not change
Do you break or overcome London forces?
BREAK
