The Effect of glucose Concentration in Anaerobic Respiration
Background Information:
Combustion is an exothermic chemical reaction between a fuel and an oxidant which produces
heat and light.
Formula:
Fuel + Oxygen  Carbon Dioxide + Water + Heat
Research Question:
Investigate if coffee products such as coffee pealing and coffee bark sawdust as well as coffee
trunk are inflammable and to what extent can they be used as weapons.
Hypothesis:
We believe combustion will take place in both coffee products as ‘wood’ is a very common fuel,
and the coffee plant’s woody stem if dried enough will be able to catch fire quickly and become
part of a combustion reaction. Coffee peeling seems to be inflammable too as its dry
complexion may allow it to be a fuel for the combustion reaction.
Fuel + Oxygen  Carbon Dioxide + Water + Heat
If we replace the fuel in the reaction above with coffee stem and coffee peeling, we believe a
combustion reaction will easily take place.
Variables:
Independent: coffee stem and coffee peeling
Dependent: energy produced by the combustion reaction Kj
Controlled:
1. Time in which the rate of combustion will take place. (5 minutes, measured with a stop
watch).
2. Amount of fuel (20 ml measured with a measuring cylinder of 25ml)
Equipment:
1.
2.
3.
4.
Matches
2 measuring cylinders of 25 ml
2 ceramic tiles
2 Stopwatches
5. balance
6. 157.1g of coffee peeling
7. 157.1 g of saw dust from coffee stem
Diagrams:
Coffee Peeling Sawdust
Burning Coffee Bark Sawdust
Coffee bark and coffee peeling
sawdust after combustion
Dried Coffee Trunk in combustion
Method: 1 saw dust from coffee peals
1.
2.
3.
4.
5.
Gather all the materials you will need to begin with your experiment.
Grind coffee peals in coffee grinder until you have very thin sawdust
Gather as much as 157.1g of saw dust
Light saw dust on fire
Clean up your area.
Method 2: Saw dust from coffee bark
1. Peal off the bark of the coffee trunk to make saw dust
2. place as much around 157.1g of saw dust in a Petri dish
3. try lighting this saw dust on fire
4. clean up your area
Method 3: combustion using coffee trunk
1. grab a dried coffee trunk
2. step next to a water tank
3. using a Bunsen burner light coffee trunk
4. rapidly dump coffee trunk inside water tank
5. clean up your area
Calculations:
Weight of saw dust= weight of beaker with saw dust – weight of beaker
Weight of beaker= 99.8g
Weight of beaker with saw dust = 256.9 g
Conclusion:
Results:
Saw dust from coffee pealings did not catch on fire
Saw dust from coffee trunk did not catch on fire but did make match flame a bit stronger
Coffee trunk did catch on fire
Evaluation: