Physical and CHEMICAL CHANGES

Sixth Grade Science Newsletter

Questions:

What are the evidences of a chemical change?

In what ways do the properties of matter change when elements are chemically combined?

How are the properties of the original substances (reactants) different from the properties of a newly formed substance (product) after a chemical reaction?

How do we know when a new substance has formed?


Can you name the Evidences of a CHEMICAL CHANGE?


Production of a Gas (bubbles)

Odor (if generated from a substance change like rotting food)

Precipitate (two liquids make a solid)

Change of Color (on a molecular level like rusting or coloring hair with chemicals)

Unexpected Temperature Change

Production of Light (fireworks and lighting a match)

Vocabulary

  • Physical change – change which alters the physical properties of a substance without changing its identity
  • Chemical change – the formation of a new substance with different properties; cannot be undone by physical means
  • Precipitate – the solid that is formed as a result of a chemical change

Brainpop - What's the difference between a physical and chemical change?

Username: kilgoremiddle Password: pop1

Chemical and Physical Changes
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A REVERSIBLE PHYSICAL CHANGE is shown in the Anthill Art video below.

The aluminum was a solid. It gets melted and becomes a liquid, then it is poured into the anthill. When it cools, it becomes a solid again. IT STAYS ALUMINUM throughout the process. NO NEW SUBSTANCE IS CREATED.
Casting a Fire Ant Colony with Molten Aluminum (Cast #043)

A CHEMICAL CHANGE is shown in the Coca Cola and Milk video below.

A precipitate forms. A precipitate is a solid that forms within a liquid and settles out. This is a new word for sixth graders. They will see this word again in future science classes.
Coca Cola and Milk Experiment
https://www.youtube.com/watch?v=akhs3wcSDGA
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https://www.youtube.com/watch?v=018uW1Tk-Q0

Evidences of a Chemical Change PHRASES:

Cute - Color

Girls - Gas

Love - Light

apps

On - Odor

Their - Temperature

Phones - Precipitate


Cool - Color

Guys - Gas

Love - Light

apps

On - Odor

Their - Temperature

Phones - Precipitate

Movie Poster Project for a Chemical or Physical Change

This is not a big poster. It will be done on a piece of white copy paper.

Movie Poster Project

Due Date: September 27th

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Chemical or Physical Change?

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Kitchen Chemistry with Professor Keri Colabroy
MAGIC SCHOOL BUS S01E09 Gets Ready, Set, Dough
The chemistry of cookies - Stephanie Warren
Kitchen Chemistry with Mrs Luegge

If you are not part of the solution, you are part of the precipitate.

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https://www.youtube.com/watch?v=uJOGy0dgmUU
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https://www.youtube.com/watch?v=iczdDNxu_hw
https://www.youtube.com/watch?v=_-ndw4KZiUI
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Everything is Changing!

1. Watch the YouTube video "Everything is Changing!"

https://www.youtube.com/watch?v=RG8VHqHgF44

2. Create a Chemical / Physical t-chart.

3. List all the Physical and Chemical changes in the song.

4. Explain how Physical and Chemical changes are defined in the song.

https://www.youtube.com/watch?v=RG8VHqHgF44
https://www.youtube.com/watch?v=4ZGULLWEy1c
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chemical and physical changes
Popping Popcorn in super Slow Motion - The Slow Mo Guys
https://www.youtube.com/watch?v=FofPjj7v414
Chemical changes vs. Physical changes
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