1. Fill up the gaps with following words
( Liquid, decreases, calorie, melting, mass)
i) The amount of heat required for increasing the temperature of a body depends on ............
ii) The unit of heat is ...............
iii) The change of state from solid to ..........is called -------.
iv) If the pressure decreases the boiling point of a liquid _-------------.
2.
a) Write the name of a substance that is non conductor of electricity .
b) What is the name of the electrode that is connected to the positive end of of the battery ?
c) What is the name of the electrode that is connected to the negative end of the battery ?
d) Which material would you use for gold plating of a metal at the anode and at the cathode ?
3. Answer the following .
a) 2 H₂O₂ = 2H₂O + O₂ , Name the catalyst of the reaction .
b) During exothermic reaction , the energy is ------------.
c) During oxidation -----------------reacts with a compound .
d) Identify the oxidation & reduction reaction
i) Fe³⁺ +e = Fe²⁺
ii) Cl⁻ = Cl + e
Answer :
1. i) mass ii) calorie iii) liquid , melting iv) decreases
2.a) plastic , wood ,glass etc b) Anode c) Cathode d) The material on which gold is to be coated is used as cathode and gold is used as anode .
3. a) manganese dioxide ( MnO₂ ) b) released c) oxygen d) i) reduction ( electron is accepted) ii) oxidation ( electron released )
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