Unit Three Flashcards
What is titration used for
to determine the volumes of solution required to reach the end point of a chemical reaction
What is an indicator used for
To show when the end point is reached
What is a concordant result
Titre volumes within 0.2 cm^3
What are standard solutions
Solutions of accurately know concentration
What do flame texts identify
The metal present in a sample
What is precipitation
The reaction of two solutions to form an insoluble salt
What can the formation of a precipitate tell you
To identify the presence of a particular ion
Collection of gasses
Collection over water
(for insoluble gases)
Downward displacement of air
(For soluble gases that are less dense than air)
Upward displacement of air
(For soluble gases that are more dense than air)
Use of three radioisotopes
C14 used for carbon dating
I132 used for treating thyroid cancer
Co60 used in radiotherapy
Half life definition
Time for half of the Nuclei of a particular isotope to decay
What is radioactive decay
It involves changes the nuclei of atoms
What is produced in the Haber process
Ammonia
What is produced in the Ostwald process
Nitric acid
What is the catalyst in the ostwald and Haber process
Ostwald- platinum
Haber- iron
Why can’t they increase temperatures in the Haber process
The backward reaction will become more dominant
(Turn 2NH3 into 3H +N2)
What are fertilisers
Substances which restore elements ,that are essential for healthy plant growth, to the soil
What are properties of ammonia
Pungent
Colourless gas
dissolved in water to produce an alkaline solution
What is a repeating unit
The shortest section of a polymer chain
What are polymers
Long chain molecules formed by joining together a large number of monomers
What are electrolytes
Electrically conducting solutions containing ions
What is a simple cell
A cell that is made by placing two metals in an electrolyte
What rod can be used in half cells
Graphite
When can electricity be produced
When at least one of the half cells does not involve metal atoms/ions
What is electrolysis
The decomposition of an ionic compound into its elements using electricity
Why should a dc supply be used in electrolysis
If you what the products to be identified
During extraction of metals what happens to the metal ions
They are reduced, forming metal atoms
Reactions of metals
Metal+ oxygen
Metal+water
Metal+ dilute acid
Metal oxide
Metal hydroxide+ hydrogen
Salt+ hydrogen
What is the definition of metallic bonding
Is the electrostatic force of attraction between positively charged ions and delocalised electrons
Why can metals conduct electricity
They contain delocalised electrons
Temperature of haber & ostwald
H= 450
O= 800
