Random Flashcards
What must be present for combustion to take place?
Oxygen
What is the formula for nitrogen?
N2
What colour is bromine water in alkanes and alkenes?
Alkanes - orange
Alkenes - de colourised
What are group 7 elements called?
Halogens
What is an isotope?
An atom with the same atomic number but different mass number
What does water do to anhydrous copper (II) sulphate?
Turns it blue
What is needed in iron to rust?
Oxygen and water
What can you coat Iron with to protect rusting?
Paint or zinc. Costing with zinc is called galvanising. It works because zinc is more reactive than iron so will corrode first
How is iron extracted?
Burning with Carbon or carbon monoxide
What ions are given out in acids?
Hydrogen ions
What is the equation for mass, moles and MR?
Mass = Mr x Moles
What is the equation for volume, moles and 24?
Volume = mol x 24
What do you get with Mg + steam?
MgO
What happens to a reducing agent?
It becomes oxidised
How to remember enthalpy bond breaking?
MEXO BENDO
Where does the haber process get its gases?
It takes nitrogen from the air and hydrogen from natural gases
what is a covalent bond?
A shared pair of electrons
What is an ionic bond?
The transfer of one electron from one atom to another
What is an ion?
An electrically charged particle
What is metallic bonding?
An array of positive ions in a sea of delocalised electrons
What is diffusion?
The movement of particles from high concentration to low concentration
Is exothermic positive or negative?
Negative - energy is given out, heat goes up
What is ammonia used for?
Manufacture of fertiliser, nitric acid and nylon
What is the empirical formula
The simplest formula
What colour is phenolphthalein in acids and alkalis?
Colourless in acids
PINK in alkalis
