Generation Science Chemical and Physical Changes

Generation Science Chemical and Physical Changes

​Lesson Objectives

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• We will learn that in a chemical change we form an entirely new substance.

• We will learn in a physical change, we don't form a new substance.

• We will learn that Physical changes also occur when matter changes states.

​Vocabulary

​catalyst. A substance that speeds up a chemical reaction.

​chemical change: A type of change in which a new substance is formed. For example: burning something.

​physical change: A type of change in which a new substance is NOT formed. For example: water boiling.

​oxidizer: A chemical that provides a lot of oxygen to help things burn.

​carbon dioxide: A gas without any color or smell that is commonly found in soda. It is also called CO2 and comes out the back of a car or bus that is running.

​hydrogen: A gas less dense than air that has no color or smell. It is extremely flammable meaning it can burn

​States of Matter: The main forms matter can exist in: Solid, Liquid and Gas (also plasma but that is less common on earth).

​Questions Before the Video

How are chemical changes different from physical changes?

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​How are chemical changes different from physical changes?

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Is toasting a piece of bread an example of a physical or chemical change?

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When the banana, berries, water and hot dog are blended, does a physical or chemical change occur? Why?

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Is water evaporating an example of a physical or chemical change?

​Chemical changes happen when substances change to form new ones, while physical changes do not form any new substances.

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​Heating bread in a toaster is a chemical change. The surface of the bread burns, forming a new substance

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Blending the banana, berries, water and hot dog chops them up into tiny pieces, but doesn’t create a new substance. Therefore, it is an example of a physical change.

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​Evaporation means to turn a liquid into a gas. Water in gas form is not a new substance (it is still water) so that makes it a physical change.

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Multiple Choice

Which of these is true of fruits blended together?

• chemical change

• physical change

• both types of change

• none of these

Multiple Choice

Gallium spoon melting is a physical change because a puddle of _____ metal is left afterwards.

• iron

• steel

• aluminum

• gallium

Multiple Choice

Changes between states of matter are often which?

• chemical changes

• physical changes

• both

• neither

Multiple Choice

When something burns it is which of these?

• chemical change

• physical change

Multiple Choice

What caused the candles to go out?

• oxygen

• Izzy blowing on them

• carbon dioxide

• hydrogen

Multiple Choice

The spoiling of milk is an example of which type of change?

• physical

• chemical

• both

• neither

Multiple Choice

Why is this a physical change?

• it makes a mess

• same gas before and after

• it changes form

• it's not, it's a chemical change

Multiple Choice

How does the team know the gas produced is hydrogen?

• density

• direct observation

• temperature

• flame test

Multiple Choice

How does hydrogen react in a flame test?

• a pop

• puts fame out

• nothing happens

• changes color

Multiple Choice

Is mixing air into egg whites a physical or chemical change?

• physical

• chemical

• both

• neither

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