Year 11
Chemistry Worksheet
Name:
Data:
Q1. There are two types of chemical reactions
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Q2. There are many different forms of energy such as
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Q3. The SI unit of energy is _______________________________
Q4. 1MJ = ______________KJ = ____________________J = 1.0 x 106 J
Q5. What is law of conservation of energy?
Q6.
In Chemistry, the system is usually the _______________________________.
Q7.
The surroundings are usually regarded as _____________________________.
Q8. Energy will be _______________ or __________________________ during a chemical
reaction.
Q9. The chemical reaction in which energy is ________________________ is called exothermic
reaction.
Q10. The chemical reaction in which energy is ________________________ is called endothermic
reaction.
Q11. What is an endothermic and an exothermic process?
Q13. All reactions absorb some energy before they can proceed, even if energy is released overall.
(True / False)
Q14.
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The enthalpy of the reactant is represented by a symbol ________________________
The enthalpy of the product is represented by a symbol ________________________
Q15. Define enthalpy change.
Q16. When Hp is _____________ than Hr, energy is released from the system into the surroundings
so the reaction is _____________________. The system has lost energy so
has ______ value.
Q16. When Hp is _____________ than Hr, energy is absorbed from the surroundings into the
system so the reaction is _____________________. The system has lost energy so
has
______ value.
Q17. If the coefficients of the thermochemical equation are doubled, the
__________.
will also be