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Transcript of Sceince Investigation
BY Isabelle Hurree
Designing a Fair test
This will ensure that our experiment was done and proceeded properly and to the best standard.
Equipment and Material:
Plastic cups x4
Measuring containers x1
Ivestigation: Day 1 12:00pm
The aim was to observe and measure the state of 4 solids when put into water and left out into the atmosphere for a period of time.
our observances part 2
when the coffee was drained into the water it floated at the surface gradually bit by bit it fell to the bottom it stayed dissolving whilst the water turned brown with the flavour and dye.
About a solid in water.
first when the solids where poured into the water, the water gained capacity with flour 3.5cms, sugar 3.5cm, salt 3.4cms and coffee 3.7cms. But when the concotions where exposed to the sun the level of the water slowly decreasing
the actions to cause change
was water as it dissolved most of the solids rapidly also heat wasn't a big factor in the actions to cause change as the heat from the sun evaporated a small portion of the water and turning that portion into a gas
Physical or Chemical
This experiment was a
test. If the test went for an even more extensive amount of time . The water witih each solid in one would soon evaporate due to the suns heat, leaving almost the entire amount of the solid behind almost reversing the entire experiment.
If the solids are left in water with out being stirred then over a period of time the solids will gradually combine into the water before slowly evaporating.
When placed into the liquid like water it is the most resistant to sinking, it took 30m - 1hr to link into the 100ml of water. Because of the substances weight it was more capable of staying afloat. Once the flour had sunk it's form had not seperated or dissolved into the liquid.
when poured into the liquid the sugar sunk straight to the bottom where it dissolved rapidly. This is because the sugar was granulated in tiny chunks so it was made easier for the sugar to dissolve through the liquid.
the process was very similar to the sugar as the salt instantly started to dissolve yet at a slower pace it also turned a murky yellowy colour as it was poured into the 100ml water.
types of solids,
flour,coffee,salt and sugar
depth of water and changes of solids
amount of water,
amount of each solid,
period of time and
location of cups.
1. Carefully measure 4 x 100ml of water into 4 cups
2. Measure 20g of each solid
3. Place cups in location
4. Check ups constantly every 2 hours and measure water level fro 2 days.
An improvement we could make to make sure the entire experiment was a fair test we could of poured each of the solids in at the same time, yet that wasn't a big factor that could of been changed. Given the small amount of time we where timing our findings where not as clear as we would of hoped so next time if we had more time we could really observe changes within the solids, also if we would do the experiment again we should change the solids so they are more solidified objects because with our materials we had solids like sugar and salt which are granulated which made the solids easier to dissolve in the 100ml water. Lastly the sun was not a reliable source as temperature would change yet an alternative would be to use a heat lamp for a steady and constant temperature throughout our experiment! we had many difficultys with our experiment and these changes or alternatives could imporve the out come