Unit B Section 1.3 Flashcards

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1
Q

physical change?

A

A physical change is one in which a material changes from one state to another. The material can also physically change back into its original state.

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2
Q

chemical change?

A

A chemical change occurs when two or more materials react and create new materials. The new materials have completely different properties from the original substances.

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3
Q

Evidence of Chemical Change

A
  • Change in colour (bleach)
  • Change in odour (striking match)
  • Formation of a solid or gas(vinegar+baking s=CO2 gas)
  • Release or absorption of heat energy (gasoline in car)
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4
Q

Freeze-drying? (example of controlling matter)

A

Freeze-drying is a way to preserve foods so that they can be eaten for months, you have to do is add hot water

-The result is that about 98% of the water in the original food item is removed.

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5
Q

U.S. Army, makes freeze-dried food?

A

“Meal, Ready to Eat” (also referred to as an MRE) is
heated in a special package called a “Flameless Ration Heater.” This makes MREs especially useful for soldiers, astronauts, and mountain climbers.

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6
Q

How do chemicals made from corn can be used to make soda pop bottles, remove paint or nail polish, and fuel some cars?

A

Corn is put through a chemical change called fermentation.

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