Changes
What is a physical change?
A physical change changes the way something LOOKS, not the substance.
Can matter be created or destroyed?
NO!
Can human and animal cells go through photosynthesis?
No! Photosynthesis only happens in plant cells.
What is a chemical change?
A chemical change creates a new substance.
Mrs. Whitlock had a jar that weighed 25 ounces. She added Alani to it and the new mass weighed 60 ounces. She then froze the Alani in the jar. After the Alani froze, what was the mass of liquid & jar?
60 ounces because nothing changed!! Matter was not created or destroyed just FROZEN!
What do plants turn into food?
SUNLIGHT!
If a liquid becomes a solid, does it gain weight?
NO!
What 3 things do plants need to create their own food?
Air, Sun and Water!
If you pour milk over a bowl of dry cereal, do you think this creates a mixture or a solution?
MIXTURE!
Mrs. Whitlock makes cupcakes. All the ingredients are in the bowl and have a mass of 50 grams. As she mixes the ingredients together, does the mass increase, decrease or stay the same?
STAYS THE SAME!
What do plants produce that humans need to survive?
Oxygen!
Give me an example of a chemical change!
Student answer....
A cup of water weights 240 grams. You add 5 grams of sugar and 5 grams of lime juice. What is the combined weight of the water, sugar and lime juice?
250 grams.
What do humans produce that plants need for photosynthesis?
Carbon Dioxide.