Karteikarten
Chemistry
Karten in diesem Stapel (26)
- 1What is the general formula for alkanes?CnH2n+2 (little 2's)
- 2How can alkanes be described?Saturated
- 3What is a covalent bond?A pair of shared electrons
- 4What is the formula for an alkene?C2H4 (little 2 and 4)
- 5How can alkenes be described?Unsaturated
- 6What happens to bromine when it is mixed with an alkene?Bromine water changes from orange-brown to colourless when mixed with an alkene
- 7In the reaction, ethene -> poly(ethene):Ethene is the monomer
- 8Why does paint contain a pigment?To give the paint its colour
- 9Colloids:The particles of one substance are mixed and dispersed with particles of another substance without dissolving
- 10What is the key feature of thermochromic paints?They change colour at different temperatures
- 11Which process removes carbon dioxide from the atmosphere?Photosynthesis
- 12Which of these process releases carbon monoxide into the atmosphere?Incomplete combustion
- 13What is combustion?Rapid chemical combination of a substance with oxygen, involving the production of heat and light
- 14One of the key reactions in a catalytic converter is:carbon monoxide + nitrogen oxide → nitrogen + carbon dioxide
- 15What caused the proportion of oxygen in the atmosphere to increase?Photosynthesis
- 16Which of the following is a reason for the decrease in water vapour in the Earth's atmosphere?Water vapour condensed to form the oceans
- 17Why is crude oil called a fossil fuel?Because it is formed from the remains of ancient sea creatures
- 18What happens to a liquid during its separation from a mixture by distillation?A liquid during its separation from a mixture by distillation evaporates then condenses
- 19The top of an oil fractionating column is:The top of an oil fractionating column is colder than the bottom of the column
- 20Compared to large hydrocarbons, small hydrocarbons are:More volatile
- 21Which process allows large hydrocarbons to be broken down into smaller hydrocarbons?Cracking
- 22How is a positively charged ion formed from an atom?Positive ions are formed from neutral atoms when one or more electrons is lost. If electrons are gained, the ion will be negative.
- 23What will be the charge on an aluminium ion?For metal elements in Groups 1, 2 and 3 of the periodic table, the ionic charge is equal to their group number, so the aluminium ion will have a charge of 3+. Elements in Group 2 will have an ionic charge of 2+.
- 24What will be the charge on a sulfide ion, formed from a sulfur atom?Sulfur is in group 6 of the periodic table. This means it has six electrons in its outer shell, so it will gain two to become stable, meaning a charge of 2-. Some elements in Group 3 form ions with a charge of 3-.
- 25What will be the formula of an ionic compound formed from calcium and oxygen?CaO
- 26When a negative ion is formed because an atom has gained an electron, what term can be used to describe this process?Reduction - gain of electrons
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- Karteikarten am Chemistry, erstellt von olidun2015 am 14/04/2015.
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- olidun2015
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