1. Fill a small glass with ice fresh from the freezer and immediately pour some
ID: 495584 • Letter: 1
Question
1. Fill a small glass with ice fresh from the freezer and immediately pour some soda into the glass. Is it a physical or chemical change? Explain why.
2. Now fill a second glass with ice and fill the glass with tapwater. After a few seconds, drain the water and add soda to this glass. Is it a physical or chemical change? Explain why.
3. Fill a glass half full of 7-UP. Sprinkle a little salt. Add additional small amounts of salt two more times. Is it a physical or chemical change? Explain why.
4. Fill a glass with water and add a couple of drops of blue food coloring while stirring. Observe the color and then add a couple of drops of yellow food coloring. Observe the new color. Is it a physical or chemical change? Explain why.
Explanation / Answer
1. It is a physical change as the ice will melt due to temperature difference, water will be formed. No change of chemical formula involved, only physical state of substance is changed. Similarly some carbon dioxide which was earlier dissolved under High pressure in soda bottle, escapes out in gaseous phase, this is again a physical change from liquid to gas. No chemical change or formation of new products is seen
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