The periodic table
what is group 2 on the periodic table called
What is Alkaline Earth Metals
What is sonorous
What is a word to describe a metallic substance that rings like a bell when hit with a hammer
What is a ore
What is a naturally occurring mineral from which a metal can be extracted
What is the composition of argon and oxygen in dry air
What is 0.90% and 21%
What is corrosive:
What is a corrosive substance (e.g. an acid) is one that can dissolve or 'eat away' at other materials
Explain why silicon(IV) oxide has higher melting point than sulfur dioxide, even when both are covalently bonded
What is SiO2 has a giant covalent structure with many strong covalent bonds that need breaking. SO2 has a simple molecular structure with weak intermolecular forces that are easily overcome.
Any four properties of metal
What is
melting points and boiling points
electrical conductivity
thermal conductivity
malleability and ductility
strength and hardness
ability to produce a sound
colour and appearance
Name 4 substances that are added to blast furnace in extraction of iron
What is limestone, coke, iron ore, hot air
What is photochemical smog
What is a form of local atmospheric pollution found in large cities in which several gases react with each other to produce harmful products
What is the color of Phenolphthalein in neutral, acid and in alkali
What is colorless, colourless and pink
What is the trend in group 1 element
What is melting points and boiling points decrease down the group
metals get softer as we go down the group
densities increase as we go down the group
What is composition of stainless steel and the percentage of it with the use of it
what is Iron 74%,chromium 18% and tin 8%
resists corrosion
Why is extracting aluminium expensive?
What Is the carbon anodes burn away as they react with oxygen to form
Name two pollutants that both cause respiratory issues
What is carbon monoxide as it can bond with the rbc
and sulfur dioxide can result in breathing problems
Difference in properties between Acid and base
What is
acids:
solutions contain an excess of H+ ions and have a pH lower than 7.0
turn blue litmus red
are neutralised by a base to give a salt and water only.
Bases:
are the oxides and hydroxides of metals
neutralise acids to give a salt and water only
are mainly insoluble in water
All the properties of transition metals
they are hard and strong
they have high density
they have high melting and boiling points.
Distinctive properties of transition metals:
many of their compounds are coloured
the transition metals, or their compounds, often act as catalysts.
they often show more than one valency (variable oxidation number)
Property of copper, zinc and aluminum
what is copper strong but can be bend and good electrical conductivity
zinc protective coating on iron and steel object
aluminium low density and strong, resistant to corrosion by acid of food
What is all the reaction present in a blast furnace and give the reaction
What is the burning of carbon (coke) to provide heat and produce carbon dioxide
C + O2 → CO2
the reduction of carbon dioxide to carbon monoxide
CO2 +C → CO
the reduction of iron(III) oxide by carbon monoxide
CO+Fe2O3 → Fe +CO2
the thermal decomposition of limestone (calcium carbonate) to produce calcium oxide (lime)
CacO → CaO +CO2
the use of limestone to remove the main impurity (sand) as slag (calcium silicate).
CaO + SiO2 → CaSiO3
The process to purify water for domestic water supply
What is screen, precipitators, rapid gravity sand filters, activated carbon granules, chlorine and reach the tap
Tell me the flame test of the following element
sodium , Magnesium , sulfur , phosphorus,copper and carbon
What is yellow , bright white , bright blue , yellow , does not burn but turn black and glows red