Changes in Matter

Multiple Choice

What is a physical change?

• It alters the form or appearance of matter

• It turns any substance into a different substance

• It involves a chemical reaction

• It is irreversible

Hotspot

Select all the examples of a physical change.

Multiple Choice

Ice Melting

• Chemical Change
• Physical Change

Dropdown

Iron is a metal that can be made into a magnet. When iron is magnetized, it attracts other metals containing iron. Magnetization is an example of a ___ change because iron ___ change into a new substance.

Select answer

Select answer

Multiple Choice

What is a chemical change?

• A change in matter that forms new substances

• A change that can be reversed

• A change that does not involve new substances

• A change that only affects physical properties

Multiple Choice

Is milk going sour a physical or chemical change?

• Physical 
• Chemical

Multiple Choice

A chemical change happens when...

• a substance is changed at the atomic level 
• bonds are broken and formed 
• a new substance is made
• all of the above! 

Multiple Choice

Rewrite the following false statement to make it true: Chemical changes are usually reversible.

• Chemical changes are not usually reversible.

• Chemical changes are always reversible.

• Chemical changes can be reversed in some cases.

• Chemical changes are sometimes reversible.

Multiple Choice

Which is the best example of a change that can be undone?

• clay put in an oven to harden
• cake batter put in an oven to bake
• chocolate left in a warm car to melt
• wood being burnt

Multiple Choice

Marie had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Marie determine about the new substance formed by mixing the baking soda and pickle juice?

• A chemical reaction produced a solid.
• A chemical reaction produced a gas.
• No chemical reaction took place.
• Only a physical change happened.

Labeling

Which is a chemical change and which is a physical change?

Drag labels to their correct position on the image

Dissolving

Photosynthesis

Multiple Choice

Which of the following characteristics is shared by all chemical reactions?

• Produce a precipitate
• Show a color change
• Release heat energy
• Form new substances

Dropdown

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Select answer

Physical Changes are reversible

Multiple Choice

A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –

• the white crystals were added to the clear liquid.
• the crystals dissolved in the liquid leaving only the liquid visible.
• There are no indications of chemical change
• the temperature of the liquid increased and an unexpected color change occurred.

Multiple Choice

What are the signs that indicate a physical change?

• Signs of a physical change include changes in size, shape, phase, and texture.
• Signs of a physical change include changes in mass and density.
• Signs of a physical change include changes in temperature and pressure.
• Signs of a physical change include changes in color and smell.

Multiple Choice

What is the difference between a physical change and a chemical change?

• A physical change alters the form of a substance but not its chemical composition.

• A chemical change alters the chemical composition of a substance.

• Both types of changes can be reversible.

• Physical changes are always temporary.

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident

Categorize

Options (5)

Chopping wood

Ice cube melting

Steam from a shower

Burning wood

A bike rusting

Classify the following as Chemical Change or a Physical Change.

Physical Change

Chemical Change

Multiple Choice

Alka-Seltzer gives off carbon dioxide when added to water

• physical change
• chemical change

Multiple Choice

water freezes at 0⁰C

• physical change
• chemical change