Energy Seed Content

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NAME: EDINA SAMUEL
NAME: EDINA SAMUEL

Date: 08/04/13
Skills Assessed:
CE, DCP, D
Topic:
Energy content of seeds

Research Question (Focused Problem):
Which seed, between maize seeds, peanut seeds and black eyed peas, has the highest energy value per gram of seed?

CRITERION| D| DCP| CE.|
Achievement Of Aspects| | | | | | | | | |
Marks For Achievement| | | | | | | | | |
Achievement Level Awarded| | | |
Duration| | | |

Date: 08/04/13
Skills Assessed:
CE, DCP, D
Topic:
Energy content of seeds

Research Question (Focused Problem):
Which seed, between maize seeds, peanut seeds and black eyed peas, has the highest energy value per gram of seed?

CRITERION| D| DCP| CE.|
Achievement Of Aspects| | | | | | | | | |
Marks For Achievement| | | | | | | | | |
Achievement Level Awarded| | | |
Duration| | | |

Introduction:

In this experiment, three different seeds (maize seeds, red peanut seeds and black eyed peas) were be used and the energy value per gram of each seed was be measured. The purpose of this experiment was to find which of the four seeds contains the highest average energy value per gram of seed.

Energy value per gram of seed can be calculated using the formula:

Energy Value per gram of seed=Volume of water×Change in temperature of water×4.2Mass of seed

Hypothesis:
The red peanuts will release the most energy per gram because its mass is greater than the other seed which implies that it has a lot of energy stored in it.

Variables:

* Independent variables:
* Mass of seed
* Dependent variables:
* Change in temperature of water
* Energy value per gram of seed
* Controlled:
* Volume of water used (20 cm3)
* Boiling tube used (20 cm3)
* Uncontrolled
* Type of seed
* Heat lost to the environment

Effective control of variables:

* Close windows to reduce wind levels thus avoiding heat loss * the same 20 cm3 boiling tube is used
* Use the same thermometer during the experiment to ensure accurate readings

Apparatus:

* Boiling tube (20 cm3)
* 5 Maize seeds
* 5 Peanut seeds
* 5 black eyed peas seeds
* Retort stand
* Electronic scale
* Bunsen burner
* Distilled water
* Thermometer
* forceps

Effective control of apparatus:

* Make sure the boiling tube is emptied and rinsed after each trial * Keep working space clear to and Bunsen burner wire straight to avoid flames * Take reading of volume of water in boiling tube below the meniscus * Make sure that the electronic scale reading is zero before placing seed on it Procedure:

1. Select one of each kind of seed
2. Weigh each seed with the electronic scale and record their masses 3. Fill the boiling tube with 10cm3 of distilled water
4. Find the temperature of the water record it
5. Switch on the Bunsen burner
6. Collect a seed with the forceps
7. Place it in the flame
8. Wait patiently for the seed to flare into flames
9. Carefully place the flaming seed underneath the boiling tube. 10. When the flame goes out, find the temperature of the water 11. Record it
12. Using the forceps, carefully carry the boiling tube to a sink and rinse it 13. Wipe it with tissue
14. Wipe the forceps as well
15. Repeat steps 3-14 for each of the remaining seeds
16. Repeat steps 1-15 for a minimum of 5 times
RESULTS (UN PROCESSED DATA)
SEED| MASS OF SEED/g(+/- 0.01)| VOLUME OF WATER USED/cm3 (+/- 1.00)| TEMPERATURE OF WATER(˚C) (+/- 0.50)| | | | INITIAL| FINAL|
Black eyed peas| 0.25| 20.00| 26.00| 32.00|
| 0.35| 20.00| 26.00| 34.00|
| 0.32| 20.00| 25.00| 33.00|
| 0.27| 20.00| 30.00| 35.00|
| 0.22| 20.00| 28.00| 35.00|
| | | | |
Maize | 0.35| 20.00| 30.00| 38.00|
| 0.32| 20.00|...
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