Change Detective
Published on Nov 19, 2015
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Change Detective
Photo by jenny downing
Melting Chocolate
- reversible
- Solid to a Liquid
- Physical change
Melted chocolate is a reversible change and can be changed to its original size an shape it can only be reversed by cooling the chocolate.
the chocolate started in the state of a solid then turned to a liquid because of the temperature it was heated from. This change from the chocolate is a physical change because it was caused by temperature but if it was caused by motion or pressure it would be a Physical change too. A physical change is a change in size or state of matter in this case the size has changed.
the chocolate started in the state of a solid then turned to a liquid because of the temperature it was heated from. This change from the chocolate is a physical change because it was caused by temperature but if it was caused by motion or pressure it would be a Physical change too. A physical change is a change in size or state of matter in this case the size has changed.
Photo by peter pearson
Burning Candle
- irreversible change
- Chemical change and Physical change
- solid to a liquid to a gas
The burning candle is irreversible because once the wick has been burnt it gets charcoal on it and this can not be reversed. When you have a candle it starts out as a solid then once the candle has been lit after a while the wax starts to melt into a liquid. Then when you are finished with the candle you blow it out but when it is blown out the gas from the candle starts to evaporates into the atmosphere. Burning a candle is both a chemical and physical change. It can be a physical change because temperature was caused for these events to happen. It is a chemical change as well because the molecules change from only nudging a tiny bit against each other when it was a solid and then they started moving a bit more because the candle had melted to a liquid then the molecules were free once the candle was blown out and which made a gas.
Photo by EarthWizard
Berocca and Water
- Chemical change
- Irreversible
- Solid to a liquid/gas
Berocca is a chemical change this is because the berocca tablet dissolved into the water therefore the tablet was no more. The size of the tablet caused the water to turn from clear to orange then it started to bubble. The berocca in the water is irreversible this is because you can't in anyway form the tablet to the same size or shape and make the water clear again. The berocca starts as a solid then when it is put in the water it dissolves into the water making the water turn orange and start to bubble. When this liquid starts to bubble it turns into a gas and evaporates into the air. therefore it started as a solid then went ti a liquid and during it is a liquid it turns into a gas.
Photo by pj_in_oz
Frozen Milk
- reversible
- physical change
- liquid to a solid
Frozen milk is reversible because it was froze to become what it is and it can be melted to be returned into its original size and shape. The frozen milk is a physical change because it was caused by temperature, for it to freeze. Therefore the molecules were moving around a lit bit because it started out as a liquid but because it was cooled and frozen overtime by temperature it turned into a solid which turned to molecules of the milk to only be slightly nudging against each other. But if you were to melt the frozen milk it would go back to a liquid.
Photo by spookypeanut
Burnt chocolate
- irreversible
- Chemical change
- Solid to a liquid to a solid
The burnt chocolate is irreversible because it can not turn to its original shape or size. This is because it has grown a new substance. This is a chemical change because the burnt chocolate has grown a new substance on it. The burnt chocolate has gone from a solid to a liquid to a solid. This is because the chocolate started has a solid but was melted by heat but was burnt in the progress of it being melted which made it go from a solid to a liquid to a solid.
Photo by yee.leng
Melted ice bock
- Reversible
- Physical change
- Solid to a liquid
The melted ice block is reversible because it was just melted and we can freeze the melted ice block to turn it into a normal ice block. this is a physical change because the melted ice block has had temperature to cause this ice block to change matter. This matter that has been changed is that it started as liquid but turned into a liquid because of the temperature change.
Photo by nSeika
Glass of salt and water
- Reversible
- Physical change
- Solid to a liquid
The glass of salt with water in it is reversible because if you put both the water and salt in a pan and heat it up. The water will evaporate in the air and all that will be left in the pot is the salt crystals. Therefore it is reversible. The salt in the water is a physical change because motion was used for the salt to be in the water. The salt starts out as a solid then turns into a liquid, after you stir the salt in the water this is because the salt has dissolved into the water.
Photo by djwtwo
Glass of water, bicarbonate of soda and citric acid
- Irreversible
- Chemical change
- solid to a liquid to a gas
The Glass of water, bicarbonate of soda and citric acid it is irreversible because even if you heat or cool down it doesn't do anything to the vinegar therefore it is irreversible. The Glass of water, bicarbonate of soda and citric acid is a chemical change because it is irreversible. The Glass of water, bicarbonate of soda and citric acid starts as a solid and once it is in the water it dissolves and turns into a liquid this is because it dissolved into the liquid. Then it turns into a gas this is because there is so much pressure building from this reaction of these two substances. It has enough gas to fill an entire balloon.
Photo by athriftymrs.com
Spilt vinegar
- Liquid to a gas
- Reversible
- Physical change
The spilt vinegar is reversible this is because you can capture the gas and cool it down to a liquid therefore it is reversible. The spilt vinegar is a physical change because there was no new substance added to the vinegar. The vinegar starts as a liquid and while it is in the bowel it starts to turn into a gas and evaporate this is why you can smell vinegar very strongly if it has evaporated.
Photo by Joe Shlabotnik
I assume that the mess scene had been in the room for at least 5 to 10 minutes. This is because it would have taken time for the Berocca to bubble and for the Glass of water, bicarbonate of soda and citric acid to bubble. The spilt vinegar would take a while to fill the room with the smell. Also to prove my point the frozen milk when we arrived into the classroom it was melted quite a lot but not fully this is because of the room temperature that was the same with the melted ice block.
Photo by DELLipo™
