Unit 3 Flashcards
What do plants need to grow?
Nitrogen phosphorus and potassium
Plants can get these from?
Fertilisers or synthetic fertilisers.
Synthetic fertilisers are made using neutralisation reactions this is?
Acid + Base –——> salt + water
How do you calculate percentage composition?
Total mass of an element divided by the GFM of compound times by 100 gives you your percentage.
Ammonia is made using the ……process
Haber
The reaction for this is?
N2 + 3H2 ———> 2NH3
What does the double Arrow mean?
That the reaction is reversible
The catalyst used in the process is?
Iron metal
Nitric acid is made using the ……….process
Ostwald
The catalyst used in this reaction is?
Platinum
Radiation can be measured using a?
Geiger counter
Name the three types of radiation
Alpha
Beta
Gamma
What type of radiation is the weakest and what is the strongest?
Alpha to Gamma
What is nuclear reactions?
Nuclear reactions as the fusion of nucleuses to form new elements
What is radioactive decay?
When a radioisotope emits radiation it’s nucleus changes this is known as a radioactive decay
What happens when it decays ?
Its mass and activity decrease
What is meant by the term half life?
Half life is the time taken for the mass or activity of a radio isotope to decrease by half
How to calculate half life value
Half life = time Divided by the number of half lives
Uses for radio isotopes
Cobalt 60 used to treat cancer
Carbon-14 dating used to determine the age of remains of objects that once lived
Gamma or better sources used to measure the thickness of paper
Qualitative tells you what?
Is present
You can do this by using?
Flame tests
precipitation
chromatography
Quantitative tells you what
How much is present
You can do this by using?
Acid or base traditions gravimetric analysis
Metal plus oxygen equals?
Metal oxides
Metals react with water to produce?
Metal hydroxide plus hydrogen
Metals react with acid to produce?
Metal salt plus hydrogen
Thermal plastics are polymers that can be what when he did?
Reshaped
What cannot be reshaped by heating?
Thermosetting polymer
Monomers join together to form a polymer in watch reaction?
Addition polymerisation
The reactivity series shows what a metal is?
Reactive
At the top you have to use?
Electrolysis
In the middle you use?
Heat with carbon
At the bottom you use?
Heat alone
What is electrolysis
Electrolysis is when you break compound using electricity
What is a reduction reaction
A reduction reaction is when ions gain electrons to become elements
What is an oxidation reaction?
An oxidation reaction is when elements lose electrons to form ions
What is a redox reaction?
A redox reaction is a combination of oxidation and reduction reactions
A cell is made up of?
Two metal is separated by an electrolyte
What is an electrolyte?
And electrolyte as an ionic solution or paste
Where do electrons flow and where do ions for?
Electrons flow and wires and ions flow in the electrolytes
Electrons flow from the metal…… in the electrochemical series to the metal ……
Higher to lower
What is a half cell?
Half cell consists of metal dipped into a solution of it’s own Ions
The Ion bridge is there for what reason?
It allows the ions to flow complete in the circuit
What are polymers
Polymers is a long chain made up of small units called monomers
