Exploring Chemical and Physical Changes

The video tutorial explains the differences between chemical and physical changes through various demonstrations. It covers energy changes, gas evolution, precipitate formation, color changes, and physical changes using food coloring, banana decomposition, sodium polyacrylate, and an energy stick. Each demonstration highlights key indicators of chemical or physical changes, such as color change, gas evolution, and formation of new substances.

What happens to the bonds in a substance during a chemical change?

• They break and rearrange.

• They dissolve in water.

• They remain the same.

• They become stronger.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a chemical change?

• Mixing sand and water

• Melting ice

• Burning a candle

• Breaking a glass

Tags

NGSS.MS-PS1-2

What is observed when baking soda reacts with vinegar?

• Evolution of a gas

• Change in temperature

• Formation of a solid

• No reaction

Tags

NGSS.MS-PS1-2

What is a precipitate in chemistry?

• A color change in a solution

• A gas that forms during a reaction

• A solid that forms from two clear solutions

• A liquid that evaporates

What does an unusual color change in a reaction typically indicate?

• A temperature change

• No change

• A chemical reaction

• A physical change

Tags

NGSS.MS-PS1-2

What happens when red food coloring is added to water?

• The water freezes

• The water turns red

• The water evaporates

• A chemical reaction occurs

What type of change occurs when sodium polyacrylate absorbs water?

• Chemical change

• No change

• Temperature change

• Physical change

Tags

NGSS.MS-PS1-2

What is the main component in a diaper that absorbs water?

• Calcium carbonate

• Sodium polyacrylate

• Magnesium sulfate

• Sodium chloride

What completes the circuit in the energy stick demonstration?

• A metal wire

• A light bulb

• A battery

• The human body

What type of change is demonstrated by the energy stick?

• Temperature change

• No change

• Physical change

• Chemical change

Tags

NGSS.MS-PS1-4