1C June 2015 Flashcards
Why does ammonia travel faster than HCL?
Lower mass.
2 observation of magnesium burning in air?
Bright light and white solid.
Why might calcium ions be found in the filtrate?
Calcium sulphate is partially soluble.
Methane + bromine ->
bromoethane + hydrogen bromide
What comes out at the top of a fractional column?
refinery gases
What comes out at the bottom of a fraction column?
Bitumen.
How are fuel oil different to gasoline?
Higher boiling points, darker, have higher viscosities.
What is a monomer?
A molecule used to make a polymer.
Why is it better to use phenolphthalein indicator rather than universal indicator in titration?
Sharply defines end point.
Describe the structure and bonding in a group 3 metal.
Giant structure of positive ions surrounded by a sea of delocalised electrons.
Why are metals malleable?
Layers slide over each other.
If the enthalpy change = -kJ what is the forward reaction?
Exothermic.
Why isn’t hydrogen chloride acidic at room temperature?
Because the molecules don’t split and react with the liquid.
RAM?
The average mass taking in account for the different isotopes.
