Differentiating Physical and Chemical Changes

Mr. Anderson discusses the differences between physical and chemical changes, providing examples and explanations for each. He explains how physical changes affect appearance without altering the substance, while chemical changes result in new substances. Indicators of chemical changes, such as bubbles, temperature changes, and color changes, are highlighted. The video concludes with a discussion on chemical reactions and balancing equations.

Is boiling water considered a physical or chemical change?

• Physical change

• Chemical change

• Both

• Neither

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to a burger when it is eaten, in terms of physical and chemical changes?

• Both physical and chemical changes

• Only physical changes

• Neither

• Only chemical changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What remains the same during a physical change?

• Appearance only

• Chemical composition

• Both appearance and chemical composition

• None of the above

Tags

NGSS.MS-PS1-4

What is inside the bubbles in boiling water?

• Carbon dioxide

• Hydrogen and oxygen gas

• Nitrogen gas

• Water vapor

Tags

NGSS.MS-PS1-4

What indicates a chemical change has occurred when mixing vinegar and baking soda?

• Change in color

• Formation of bubbles

• Dissolution of solids

• Formation of water

Tags

NGSS.MS-PS1-2

What is the result of a chemical reaction?

• Formation of new substances

• Only physical changes

• No new substances formed

• All of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does a temperature change usually indicate in a chemical reaction?

• Cannot determine

• No change

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What does the subscript in a chemical formula indicate?

• Number of atoms in a molecule

• Number of reactions

• Number of molecules

• Number of chemical changes

Tags

NGSS.MS-PS1-1

What can be changed in a chemical equation to balance it?

• Subscripts

• Coefficients

• Both subscripts and coefficients

• Neither

Tags

NGSS.MS-PS1-5

What is not a safe practice in a lab?

• Tasting chemicals

• Wearing safety goggles

• Using a Bunsen burner

• Handling chemicals with gloves