Which observation most likely indicates that a physical change has taken place?(1 point)
A. A reaction occurs.

B. An odor occurs.

C. The temperature increases.

D. The process is reversible.

Why is freezing water a physical change?(1 point)

A. A temperature change occurs.

B. The new and original substances are different.

C. Heat is released during the process.

D. A phase change occurs.

Which option is an example of a chemical change?(1 point)
A. chopping vegetables

B. stretching a rubber band

C. folding paper

D. burning wood

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3. because the process is irreversible physically and you will have to do a chemical change to change it back ( if thats even possible which to rn its not )

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Parrain Parrain · Answer 2 · 2021-09-09T14:58:57+02:00

A physical change has taken place if D. the process is reversible
Freezing is a physical change because, D. a phase change occurs
D. Burning wood is a chemical change.

A physical change occurs when:

substance changes in some way
the chemical composition of a substance does not change
process is reversible as a result

When there is a physical change, there is usually is usually a change in phase as the substance moves from one state to another. For instance, water moves from liquid to solid when it is frozen.

A chemical change results in the chemical composition of a substance being altered. When wood is burnt, it is converted to carbon dioxide, ash and water vapor which shows that it has changed its chemical composition.

In conclusion, physical changes are reversible and can be noticed by a phase change while chemical changes affect the chemical composition of a substance.

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