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21 Cards in this Set

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  • Back
(C) What is the chemical test for water?
Anhydrous copper(II) sulfate.
(C) Name the steps taking place in water treatment plant.
1) the water is pumped in. A screen traps any big particles such as twigs.
2) A coagulent is added- a chemical to make small suspended particle stick together.
3) air is blows through th e water in flotation tanks, to make the coagulated particles float to the top.
4) The water is passed through a bed of fine sand to filter it.
5) It may happen that multiple filtrations are used here.
6) Chlorine is added to kill the bacteria and other microbes.
7) a fluoride compound is added in some plants, to help fight tooth decay.
8) The water is pumped to the storage reservior, ready for pumping to homes.
(C) State two uses of water in homes.
Washing
Drinking
(C) State two uses of water in the industry.
Cooling
Washing
(E) What process is used to seperate oxygon and nitrogen from liquid air?
fractional distillation
(E) Describe the process of removing oxygon and nitrogen from liquid air.
1) Air is pumped into the plant and filtered to remove dust particles.
2) Water vapour, carbon dioxide and pollutants are removed by first cooling the air to form water and then passing it over beds of adsorbent beads to trap the carbon dioxide.
3) Now the air is forced into a small space or compressed. This makes it hot. It is then cooled down again by recycling cold air.
(C) How many percent of the air is made up of nitrogen?
78 %
(C) Oxygon makes up 21 % of the air. True or false?
True
(C) Name the three common air pollutants.
Carbon monoxide
Oxides of Nitrogen
Sulfur Dioxide
(C) When is carbon monoxide formed?
It forms when the carbon compounds in fossil fuels burn in too little air. For example inside car engines and furnaces.
(C) When is sulfer dioxide formed?
Sulfer dioxide occurs naturally in fossil fuels (mainly in coal and oil). Furthermore, when it forms sulphur dioxide when burning.
(E) How are nitrogen oxides formed?
They are formed when nitrogen and oxygon in air react together inside hot car engines and in hot furnaces.
(E) Why is the proportion of carbon dioxide in the air increasing and why is this important?
The portion of carbon dioxide in the air is increasing as more cars are being used, fossil fuels are in high demand and the amount of deforestation is increasing.
Carbon dioxide is a greenhouse gas meaning that it traps hear around the Earth and stops it from esacaping into space. As a result the planet get warmer.
(C) Name one adverse affect of the common air pollutants on buildings.
Acid rain damaging the structure of buildings.
(C) What is the name given to the product of complete combustion of carbon- containing substances?
Carbon Dioxide
(C) What is the name given to the product of respiration and a reaction between an acid and a carbonate?
Carbon Dioxide
(E) What are the essential conditions for the manufacturing of ammonia by the Haber Process?
The essential conditions are:
high pressure
low temperature
(C) What happens during the rusting of iron?
During the rusting of iron, a reaction between air and water takes place.
(C) Name two methods of rust prevention.
1) Coat the metal with something, to kepp out air and moisture. (Paint, Grease, Plastic)
2) Use sacrificial protection.
(C) Which three elements are used in fertilisers and why are they needed?
Nitrogen, Phosphorus and Potassium are used.
Nitrogen for chlorophyll
Potassium to help produce proteins
Phosphorus helps roots to grow and helps crops to ripen.
(C) What is the test for ammonium?
Take a small amount of the solid or solution.
Add little dilute sodium hydroxide solution and heat gently.
If ammonia gas is given off then the unknown substance contains ammonium.