1. What is DATA
LOGGING ?
Process of using computer to collect data through
sensors, analyze data and save the output the
results of the collection and analysis
Data : A collection of results
Data Logging : Process handling data by using
computer technology
13. • Is the enthalpy change for this reaction
exothermic or endothermic?
• What sign should the enthalpy change
have?
• What is the equation for this reaction?
• What bonds are being broken and formed
in this reaction?
• What is this enthalpy change called?
14. • How can we make a triangle between
these reactions?
15. Enhance
Cold packs and putting ice in towel causes a cooling
effect on their person’s head and temporarily relieve
the pain and fever. Explain.
16. a) Cold Pack
• When the cold pack is used, the chemicals
inside the pack are made to react with each
other and this reaction is highly endothermic in
nature.
• Endothermic reactions involve the absorption of
heat.
17. • The ammonium nitrate mixing with the water
creates cold. The temperature of cold packs
can reach back to normal temperature.
• The heat energy is taken into the system from
the surrounding. The surrounding in this case
is the person’s head.
18. Extension
Production of Ammonia Gas :
N2 (g) + 3H2 (g) ↔ 2NH3 (g)
What will happen to the reaction if we
increase the concentration the
temperature of the reactant mixture?
19. • If the temperature of a reaction mixture is increase, the
equilibrium will shift to decrease the temperature.
• Based on Le Chatelier’s Principle which stated that if a
chemical system at equilibrium experiences a change in
concentration, temperature or total pressure, the
equilibrium will shift in order to minimize that changes a
new equilibrium is established.
20. • So, if we increase the temperature, the equilibrium will
shift to the reactant part which is left.
• So, the reaction will undergo endothermic reaction as it
use up heat energy.
• Ammonia will broken down into hydrogen and nitrogen
gas. An increase in temperature will decrease the yield
of ammonia , NH3.
