Topic 1 - 4
What is the smallest unit of an element?
What is dynamic equilibrium?
It is when rate of forward and reverse reactions are equal
Define hydrocarbon
What is the electron configuration of fluoride?
2,8
How many legs do spiders have?
8
Define the term 'compound.'
A substance with different types of atoms chemically bonded together.
Define an bronsted lowry strong acid.
What removes smell in the purification of water?
activated carbon
Which two gases causes global warming?
Carbon dioxide and methane
What is the prerequisite for AS Chemistry?
Describe metallic structure
3D giant lattice of metal cations surrounded by sea of delocalised electrons.
Explain how temperature affects the rate of a reaction.
1. Increases rate of reaction.
2. Increase in kinetic energy
3. greater frequency of successful collisions
What is the reagent needed to distinguish saturated and unsaturated compounds?
Bromine water
State two indicators used in titration
Methyl orange and thymophthalein
Which civilisation had the first written law?
Sumerians
Describe and explain the conductivity of sodium chloride.
No conductivity as solid
Conductivity as liquid or aq due to free moving ions.
What are the reagents required to test for nitrates in a solution?
What are the 3 chemical substances needed to make propylethanoate?
Propanoic acid
ethannol
concentrated sulfuric acid
Sodium hydroxide is added to a solution which forms green ppt and dissolves in excess, what is the cation present?
Chromium 3+
How many pairs of shoes does Mr Kim have?
5
How can you separate a mixture of sand and salt and ethanol? Explain the method in 3 steps.
1. Filter out sand and salt from ethanol.
2. Mix sand and salt with water.
3. Separate sand from salt with filteration.
What are the observations when aqueous sodium bromide is electrolysed? (cathode and anode)
cathode: bubbles
anode: red solution
What are the environmental impacts of excessive fertilizer use?
- too much nitrates in water
- excess growth of algae
- lack of oxygen in water
To decompose and form CaO which reacts with acid impurities
What is the Te reo Maaori word for Auckland?
Tāmaki Makaurau