Change Detectives By Rachel L. Words to know Physical Change: a change of appearance Chemical Change: a change in substance Reversible/irreversible: if.

Change

Detectives

By Rachel L

Words to know

Physical Change: a change of appearanceChemical 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

IntroductionChange detectives was a fun unit that involved

doing a lot of experiments to see how the change ofa single variable would effect the different reactions

in different ways. Some experiments turned fromliquid to solid like freezing ice and from solid to liquidlike melted chocolate. I enjoyed the unit, because Iliked doing all the experiments and making a mess!

Section one:Some of the ingredients used for ourmess scene were: A burning candle: was recoverable and was a physicalChange.The vinegar: was unrecoverable and was a physical

change.The Tubes: were recoverable and were physical

changeas 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) andwas 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 tubewas 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 whereit bubbled and dissolved.The bi-carb soda was powdery and acted like the tartaricacid……..

Ingredient list cont…….The milk carton was placed in the freezer until it becameSolid.The chocolate was put in the microwave until it became

almosta liquid.The burnt chocolate was put in the microwave for too

long!!Chocolate...

Berocca

Burnt chocolate

Vinegar

Bi-carb

Now I am going to share our experiments with you…

Section two:

Mess scene observationEvocative 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…..

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Change Detectives was a really fun unit and I

enjoyed all the experiments