UNIT 5_THE ATMOSPHERE
... How are the clouds formed?: In the areas heated by the Sun, the water evaporates and goes up to the troposphere. In the high part of the troposphere, the water vapour cools down. The cold vapor is condensed in small drops. Those drops form the clouds. There are three basic types of clouds: cirrus, c ...
... How are the clouds formed?: In the areas heated by the Sun, the water evaporates and goes up to the troposphere. In the high part of the troposphere, the water vapour cools down. The cold vapor is condensed in small drops. Those drops form the clouds. There are three basic types of clouds: cirrus, c ...
Summary notes - Kelso High School
... Sedimentary rocks are formed when substances like sediment and silt get carried in rivers and then are deposited where the river ends. When this happens over millions of years more and more layers of sediment build up and the grains at the bottom of the pile become squashed together. They can scratc ...
... Sedimentary rocks are formed when substances like sediment and silt get carried in rivers and then are deposited where the river ends. When this happens over millions of years more and more layers of sediment build up and the grains at the bottom of the pile become squashed together. They can scratc ...
Chemistry -- Acids and Bases
... base of unknown concentration with an acid of known concentration (or vice versa) until just enough acid has been added to react with all of the base (the ...
... base of unknown concentration with an acid of known concentration (or vice versa) until just enough acid has been added to react with all of the base (the ...
ICSE Board Class X Chemistry Board Paper – 2015
... (Note: Error in the question. Zinc oxide can be reduced to zinc metal by using carbon, but aluminium oxide cannot be reduced by a reducing agent.) (ii) Carbon tetrachloride is made of individual covalently bonded molecules, CCl 4. In addition, the charged particles are absent in CCl 4 which could co ...
... (Note: Error in the question. Zinc oxide can be reduced to zinc metal by using carbon, but aluminium oxide cannot be reduced by a reducing agent.) (ii) Carbon tetrachloride is made of individual covalently bonded molecules, CCl 4. In addition, the charged particles are absent in CCl 4 which could co ...
Air pollution
... soil (Mn, Hg, Pb, Zn, Al) and these elements, in high enough concentrations, will disrupt plant growth. 3) As plants come in direct contact with acid rain, surface areas of leaves and stems are damaged and make the plants vulnerable to disease. 4) Plant germination and reproduction are also disrupte ...
... soil (Mn, Hg, Pb, Zn, Al) and these elements, in high enough concentrations, will disrupt plant growth. 3) As plants come in direct contact with acid rain, surface areas of leaves and stems are damaged and make the plants vulnerable to disease. 4) Plant germination and reproduction are also disrupte ...
F324 summary - Macmillan Academy
... • Novel, useful molecules can be synthesised using organic chemistry. • A chiral molecule is more difficult to synthesise since many other optical isomers may also form – costly in money and time to separate or resolve the isomers. • Enzymes, bacteria, chiral catalysts and chiral-starting points (e. ...
... • Novel, useful molecules can be synthesised using organic chemistry. • A chiral molecule is more difficult to synthesise since many other optical isomers may also form – costly in money and time to separate or resolve the isomers. • Enzymes, bacteria, chiral catalysts and chiral-starting points (e. ...
last year`s April exam
... B8) A laboratory experiment involving the chemical oxidation of three alcohols was carried out. These alcohols were labeled “A”, “B”, and “C”, but their actual identities were unknown. When the oxidation reaction was carried out on each of A, B, and C, it was found that C did not undergo oxidation, ...
... B8) A laboratory experiment involving the chemical oxidation of three alcohols was carried out. These alcohols were labeled “A”, “B”, and “C”, but their actual identities were unknown. When the oxidation reaction was carried out on each of A, B, and C, it was found that C did not undergo oxidation, ...
Acid rain
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. Governments have made efforts since the 1970s to reduce the release of sulfur dioxide into the atmosphere with positive results. Nitrogen oxides can also be produced naturally by lightning strikes and sulfur dioxide is produced by volcanic eruptions. The chemicals in acid rain can cause paint to peel, corrosion of steel structures such as bridges, and erosion of stone statues.