General Flashcards
What is the word equation for the thermal decomposition of Limestone?
Calcium Carbonate –> Calcium oxide + carbon dioxide
What is the symbol equation for the reaction of calcium oxide with water?
CaO + H2O –> Ca(OH)2
Why does limewater go cloudy when CO2 is passed through?
Calcium carbonate is formed
What do metal carbonates and acids react to form?
A salt, carbon dioxide & water
1) What salt does hydrochloric react with acid to form?
2) What salt does sulfuric acid react with acid to form?
1) Chloride salt
2) Sulfate salt
What is a hydrocarbon made from
Carbon and hydrogen only
What is concrete made from?
Cement, sand and aggregate (water and gravel)
What is Mortar made from?
Cement water and sand
How is cement made
Heated in a kiln at 1450 with powdered clay and limestone
What is alkali
A base (substance with a pH 7+) that dissolves in water, they form OH- ions in water
What is neutralisation? What’s the equation
A reaction between a acid and a base
Acid + base –> salt + water
Name 3 indicators and what they do…
Universal indicator; red in acidm purple in alkali
Methyl orange; red in acid, yellow in alkali and neutral
Phenolphthalein; pink in alkali, colourless acid or neutral
What are the state symbols for
1) A solid
2) A liquid
3) Gas
4) Dissolved in water
1) (s)
2) (l)
3) (g)
4) (aq)
What is the equation for metal and acid reaction?
Metal + acid –> salt + hydrogen
What is the equation for a acid and metal oxide reacting?
Acid + metal oxide –> salt water
Neutralization reaction
What is the equation for a acd and metal hydroxide reacting?
Metal + metal hydroxide –> salt + water
Neutralization reaction
Equation for an acid + carbonate reacting…
Acid + carbonate –> salt + water + carbon dioxide
What does ammonia dissolve in water to make?
An alkaline solution.
What is the equation for a reaction of ammonia and nitric acid?
Ammonia + nitric acid –> ammonium nitrate
Unlike other neutralisation reactions it doesn’t produce any water
Cracking is a thermal decomposition reaction.
What are the stages?
What temperature and catalyst is needed?
Vapirise the long chain hydrocarbon.
Pass over a powdered catalyst of aluminium oxide
At a temperature of 400-700 degrees
The The long chain molecules split apart on the surface of the specks of catalyst
What is formed when a alkali metal reacts with water?
Hydrogen and an alkaline substance
What is formed when a alkali metal reacts with oxygen?
An oxde
Why do elements in the same group in the periodic table have similar properties?
Elements in the same group in the periodic table have the same number of electrons in their highest energy level giving them similar chemical properties
