Oxidation is loss of electrons, gain of oxygen or loss of hydrogen. Reduction is gain of electrons, loss of oxygen or gain or hydrogen. Rusting is an example of oxidation.
Which of the following lists of raw materials are put into the top of the blast furnace?
Haematite, coke and limestone
Iron, coke, limestone
Bauxite, coke and limestone
Which of the following statements about sacrificial protection is true?
A less reactive metal is coated over a more reactive metal.
Copper can be used to protect iron.
Zinc is used to protect iron.
What is the chemical name for rust?
Hydrated iron(III) oxide
Hydrated iron(II) oxide
Which of the following reactions involves redox?
NaOH + HCl -> NaCl + H2O
CaCO3 + H2SO4 -> CaSO4 + CO2 +H2O
CuSO4 +Mg -> MgSO4 + Cu
Which of the following statements is true?
Oxidation is the gain of electrons
Oxidation is the loss of hydrogen
Oxidation is the loss of oxygen
Which of the following half equations is correct?
Fe2+ → Fe + 2e-
Mg + 2e- → Mg2+
Cu2+ + 2e- → Cu
What is the chemical name for slag?
In the blast furnace, the reducing agent is:
Which two substances are essential for rusting to occur?
Salt and water
Water and oxygen (air)
Salt and oxygen (air)
Which of the following statements is true about the reaction of copper(II) sulfate with magnesium? CuSO4 + Mg -> MgSO4 + Cu
Magnesium atoms are reduced
Copper ions are oxidised
Magnesium atoms are oxidised