chemical energetics
Presentation
•
Chemistry
•
10th Grade
•
Practice Problem
•
Medium
Yosefina Rahayu
Used 6+ times
FREE Resource
13 Slides • 12 Questions
1
2
OBJECTIVES
3
Open Ended
in your mind, what are we going to study in this chapter?
4
graphing related to energy transfer
stoichiometry related computation
more to physical chemistry
renewable energy
5
LETS TRY THE SIMPLE EXPERIMENT
on your table, you are provided with beaker distilled water and one boat.
transfer around 50 cm3 of distilled water to beaker, then add pellets of NaOH
observe the temperature change
picture from Cambridge IGCSE and O Level Complete Chemistry Fourth ed , Oxford University Press
6
Draw
sketch your graph below (temperature against time)
7
Multiple Select
describe the EXOTHERMIC reaction
tick the correct statement
temperature increases
temperature decreases
container feels warmer
the reaction is written as follows
reactant → product + thermal energy
the reaction is written as follows
reactant + thermal energy → product
8
Multiple Select
list down the example of exothermic reaction
combustion of fuel
photosynthesis
respiration
neutralisation
thermal decomposition
9
energy level of the product is lower than the reactant since energy is being RELEASED.
the transfer of energy is from SYSTEM to SURROUNDING
enthalpy change values
(-) negative sign
10
LETS TRY THE SIMPLE EXPERIMENT
on your table, you are provided with beaker, distilled water and one boat.
transfer around 50 cm3 of distilled water to beaker, then add solid of NH4Cl
observe the temperature change
picture from Cambridge IGCSE and O Level Complete Chemistry Fourth ed , Oxford University Press
11
Draw
sketch the diagram of temperature against time for dissolving of NH4Cl
12
Multiple Select
describe the ENDOTHERMIC reaction
tick the correct statement
temperature increases
temperature decreases
container feels colder
the reaction is written as follows
reactant → product + thermal energy
the reaction is written as follows
reactant + thermal energy → product
13
Multiple Select
list down the example of endothermic reaction
corrosion of iron
photosynthesis
action of light towards the conventional photographic film
neutralisation
thermal decomposition
14
energy level of the product is higher than the reactant since energy is being ABSORBED.
the transfer of energy is from SURROUNDING to SYSTEM
enthalpy change values
(+) negative sign
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IN CONNECTION WITH ACTIVATION ENERGY
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activation energy is the minimum energy that colliding particles must have , in order to react.
picture from Cambridge IGCSE and O Level Complete Chemistry Fourth ed , Oxford University Press
17
for exothermic reaction, if the energy from the surrounding is sufficient. mixing the reactant without heating will do.
some exothermic reaction, heating from bunsen burner is needed to start the reaction.
single spark from motor allows some reactions occurred.
for endothermic reaction, which requires very high activation energy, heating must be kept until the reaction is complete.
18
picture from Cambridge IGCSE and O Level Complete Chemistry Fourth ed , Oxford University Press
19
picture from Cambridge IGCSE and O Level Complete Chemistry Fourth ed , Oxford University Press
20
picture from Cambridge IGCSE and O Level Complete Chemistry Fourth ed , Oxford University Press
21
Multiple Choice
A
B
C
D
22
Multiple Choice
Which statements about exothermic and endothermic reactions are correct?
1 During an exothermic reaction, heat is given out.
2 The temperature of an endothermic reaction goes up because heat is taken in.
3 Burning methane in the air is an exothermic reaction.
1, 2, and 3
1 and 2 only
1 and 3 only
2 and 3 only
23
Multiple Choice
Which row describes an endothermic reaction?
A
B
C
D
24
Open Ended
Hydrogen reacts with oxygen in a fuel cell.
2H2 + O2 → 2H2O
The reaction is exothermic.
286 kJ of energy is released for every mole of water formed.
Which volume of hydrogen gas, measured at room temperature and pressure, would react with oxygen with the release of 7000 J of energy?
25
Open Ended
Chlorine reacts with ethane to produce chloroethane and hydrogen chloride.
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