Questions and Answers
Which of the following is an example of a physical change?
Melting ice to form water
What occurs during a chemical reaction?
Formation of new substances
Which of the following is a sign of a chemical reaction?
Change in color or odor
Study Notes
- A physical change is when a substance undergoes a change in its physical properties such as shape, size, appearance, or state without altering its internal structure or molecular composition.
- A paper being torn is an example of a physical change as it remains as paper despite being torn into two pieces.
- Burning a paper results in the formation of new substances (ash and smoke), making it a chemical change.
- Water converting into ice is a physical change as it only alters the state of the matter, and ice can be transformed back into water through heating.
- During respiration, oxygen is utilized, resulting in the production of carbon dioxide, which is a chemical change characterized as a chemical reaction.
- A chemical reaction takes place when active substances rearrange or combine to form new substances.
- Signs of a chemical reaction include the appearance of new substances and the release or absorption of energy.
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