Transcript Rachel Change detectives

Change
Detectives
By Rachel L
Words to know
Physical Change: a change of appearance
Chemical Change: a change in substance
Reversible/irreversible: if you can get it
back to it’s original state……
Physemical: a word invented by Diny
meaning both physical and chemical
change
Introduction
Change detectives was a fun unit that involved
doing a lot of experiments to see how the change of
a single variable would effect the different reactions
in different ways. Some experiments turned from
liquid to solid like freezing ice and from solid to liquid
like melted chocolate. I enjoyed the unit, because I
liked doing all the experiments and making a mess!
Section one:
Some of the ingredients used for our
mess scene were:
A burning candle: was recoverable and was a physical
Change.
The vinegar: was unrecoverable and was a physical change.
The Tubes: were recoverable and were physical change
as well.
Berocca: was unrecoverable and was a physemical change
(both Physical and chemical.)
Tartaric acid: was unrecoverable and was a chemical change.
Bi-carb Soda: was unrecoverable and was a physemical change.
Frozen milk: was recoverable (you wouldn’t want to drink it) and
was a physical change.
Mess scene ingredients
cont…..
Melted chocolate: was recoverable and was a physical change.
Burnt chocolate: was unrecoverable (unlike the melted chocolate)
and was a physemical change (both physical and chemical)..
Each ingredient changed as the experiment continued,
this is how we started some of the experiments………
Burning candle was lit by Mrs. Fraser using a match.
The Vinegar was spilt on the smooth surface.
The unfrozen tube was placed in the freezer and The frozen tube
was left at it’s original state.
We dropped the solid Berocca Tablet in the clear liquid,
and it started to dissolve.
The powdery Tartaric acid was placed into the liquid where
it bubbled and dissolved.
The bi-carb soda was powdery and acted like the tartaric
acid……..
Ingredient list cont…….
The milk carton was placed in the freezer until it became
Solid.
The chocolate was put in the microwave until it became almost
a liquid.
The burnt chocolate was put in the microwave for too long!!
Section two:
Now I am going to share our experiments with you…
Mess scene observation
Evocative Evaporation: Proved how fast evaporation can occur….
Icy Observations: Difference in temperatures and behaviours in
different states of tubes…..
Delightful dissolving: How fast something can dissolve in
different quantities of water..
Candle capers: How candles burn in different situations..
Physical/chemical change: Classifying different ingredients into
physical and chemical using a Venn diagram plan…
Tablet investigations: How long a berocca lasts in different
temperatures of water…..
PhotosPhotosPhotosPhotosPhotosPhotosPhotosPhotosPhotosPhotosPhotosPhotos
Change Detectives was a
really fun unit and I enjoyed
all the experiments