Matter Changes
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Matter Changes
Field Notes: The Science Fair Kitchen
At a science fair, Emily watched ice cubes melt in a cup. The liquid water was still water, only in a different state. She tore a sheet of paper into strips; the pieces were still paper. Later, she mixed vinegar and baking soda. The mixture fizzed during the demonstration. In another demonstration, a steel nail left outdoors developed a reddish coating called rust. Rust forms when iron reacts with oxygen and moisture, making a new substance. Finally, Emily warmed chocolate until it melted, then cooled it until it became solid again. These observations show that a change in appearance alone does not always mean a new substance has formed. Evidence such as gas production or a new material can point to a chemical change.
Investigate the Changes
For each example, focus on whether the original substance remains the same or a new substance forms.
- Physical change: chocolate changes state but remains chocolate
- Chemical change: a new substance forms
- Neither: no change happens
- Chocolate melts, then hardens when cooled
- A steel nail rusts
- Paper is cut into strips
- Vinegar and baking soda produce a gas
- Chemical change
- Physical change
- Physical change
- Chemical change
- Ice melting
- Paper being torn
- Vinegar and baking soda making bubbles
- Iron rusting
- The mixture was in a cup
- Bubbles appeared as a gas formed
- The ingredients were poured together
- The cup sat on a table
3 printable pages
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