Fechar
How many elements are there?
What do the groups contain?
What is the symbol for sodium?
What is in the nucleus of an atom?
What orbits the nucleus?
what is the charge of an electron?
what is the overall charge of an atom?
What does the atomic number tell us?
What does the mass number tell us?
Al has 13 electrons, give its electronic structure.
What is important about elements in the same group?
What is the name for group 0 elements?
Why are group 0 elements unreactive?
What 3 ways do atoms form compounds?
What bonding is formed between a metal and non-metal?
What bonding is formed between non-metals only?
What is important about the mass of a chemical reaction?
What is the chemical name for limestone?
What is the name for the reaction where limestone is heated?
What are the 2 products of heating limestone?
Give 5 carbonates which also decompose.
What is the product of reacting calcium oxide and water?
What is calcium hydroxide used for?
What is another name for calcium hydroxide?
What do we get when we react calcium hydroxide with carbon dioxide?
What happens to lime water when you react it with carbon dioxide?
what forms when carbonates react with acid?
How do we make cement?
How do we make mortar?
How do we make concrete?
What is an ore?
What happens to an ore?
Name a metal found in the Earth by itself?
How are most metals found?
Which metals are extracted by reduction with carbon?
How are more reactive metals extracted?
What is the disadvantage of electrolysis?
What is smelting?
What is the problem with copper ores?
Name 4 other ways of extracting copper.
Why is it expensive to extract Al and Ti?
Why should we recycle metals?
How pure is iron from a blast furnace?
why is this impure iron almost useless?
What is steel?
Give a property of low carbon steel.
Give a property of high carbon steel.
Give a property of stainless steel.
Why do we usually make alloys from metals?
What do we call the elements in the central block of the periodic table?
Give three properties of transition metals?
What do we use copper for?
Why are Al and Ti useful?
What is crude oil?
What is a mixture?
What are hydrocarbons?
What are saturated compounds called?
What is the general formula for alkanes?
What process separates the compounds in crude oil?
As the carbon chain increases, what happens to the boiling point?
As the carbon chain increases what happens to the viscosity?
As the carbon chain increases, what happens to the flammability?
What elements do most fuels contain?
What gases are produced when fuels are burnt?
What happens to the carbon and hydrogen during combustion?
What is the main problem with sulphur dioxides and nitrogen dioxides?
What problem does carbon dioxide cause?
What problem do solid particles cause?
From what do we make biofuels?
How do we get small hydrocarbons from larger ones?
What is the process of cracking?
What are the products of cracking?
What is the general formula for alkenes?
What does = represent in an alkene?
What do we see when bromine water is added to alkanes?
What do we see when bromine is added to alkenes?
How are polymers made?
What are the small molecules used to make polymers called?
Give 2 uses of polymers.
Why is the disposal of polymers a problem?
What are new biodegradable plastics made from?
Give 2 methods of making ethanol.
Give the equation for fermentation.
From what are vegetable oils extracted?
How is the oil removed?
What is removed during the process?
What are vegetable oils important for?
Why are oils important?
Give an advantage of using oil to cook.
Give a disadvantage of using oil to cook.
What is an emulsion?
Give 4 uses of emulsions.
What does hydrophilic mean?
What does hydrophobic mean?
What do unsaturated molecules contain?
What happens to bromine water with unsaturated molecules?
How do we harden vegetable oils?
Describe the process of hydrogenation.
What is hardened vegetable oil?
What are the three sections of the Earth?
What are the crust and upper mantle cracked into?
How fast do tectonic plates move?
What causes tectonic movement?
What problems do plate movements cause?
What is the % of nitrogen in the atmosphere?
What is the % of oxygen in the atmosphere?
Name 2 other gases in the atmosphere.
What caused the gases in the early atmosphere?
How were the oceans formed?
What gases were present in the early atmosphere?
What is the main theory as to how life was formed?
What produced the oxygen in the atmosphere?
Where does carbon dioxide get removed from the atmosphere?
What is the problem of carbon dioxide being absorbed into the ocean?
What is causing the increase in carbon dioxide?
How do we separate the gases in the air?
Why can we separate the gases in the air?
