Past Paper Foundation 1
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pH of Acid
less than 7
which ion in an aqueous solution causes acidity
H+
What type of reaction is this : H2SO4 + 2NaOH —> Na2SO4 + 2H2O
Neutralisation
What salt is produced in this reaction: H2SO4 + 2NaOH —> Na2SO4 + 2H2O
Sodium Sulfate
How can indicator be used to show when sodium hydroxide has reacted with sulfuric acid
-Add indicator to sodium hydroxide solution -Add sulfuric acid gradually -Until indicator changes colour
Here are the symbols in group 5 of John Newland’s table: C + Si What are their names?
Carbon and Silicon
In what order is the modern periodic table aranged?
Atomic Number
Here are the element symbols in group 1 of Newland’s table, who arranged based on atomic weight: H + F + Cl What are the differences between this and group 1 of the modern periodic table?
-Hydrogen + Fluorine + Chlorine are not in group one of modern periodic table -Lithium + sodium + potassium are in group one of the periodic table
What are the differences and similarites between plum pudding model and nuclear model?
-plum pudding model has a single ball of positive charge and nuclear model has positive charges in the centre / nucleus -plum pudding model has electrons in random positions and nuclear model has electrons in fixed positions -plum pudding model has no nucleus and the nuclear model has a nucleus -plum pudding model has no neutrons and the nuclear model has neutrons in the nucleus
What products are formed at each electrode if electroysis-ing potassium bromide?
cathode = hydrogen anode = bromine
Why is copper formed at cathode during electrolysis of salts?
Copper is positive, so is attracted to negative cathode
What type of compound is calcium oxide
Base
What type of structure does Calcium Oxide have?
A giant ionic lattice in which there are strong forces of electrostatic attraction in all directions
How does oxygen (2, 6) and calcium (2, 8, 8, 2) form calcium oxide?
-calcium loses electrons and -oxygen gains electrons -two electrons are transferred -calcium has a 2+ charge -oxide has a 2– charge
Sodium chloride is dissolved in water to separate it from titanium, why is this done in an atmosphere of dry argon instead of air containing water vapour?
-Argon is unreactive -water vapour would react with sodium -air contains oxygen that would react with reactants
Why do metals conduct electricity?
-electrons in the outer shells of metal atoms are delocalised -so the electrons are free to move through the whole STRUCTURE