Unit 3 Flashcards
(44 cards)
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
