Question

what is a physical change that you can do to a piece of paper? 2 points eat it burn it make a paper airplane add acid to change its color which of the following is a chemical property? 2 points color hardness freezing point ability to react with oxygen what must occur when there is a chemical reaction? * 2 points there must be a change in chemical properties to make a new substance there must be a change in physical properties the change must involve a change in mass the change must involve a change in volume

Explanation:

1. Making a paper airplane is a physical change as it only alters the shape of the paper without changing its chemical composition. Eating paper is a biological - digestive process, burning paper is a chemical change (combustion), and adding acid to change color is a chemical reaction.
2. The ability to react with oxygen is a chemical property as it involves a chemical reaction. Color, hardness, and freezing point are physical properties.
3. In a chemical reaction, there must be a change in chemical properties to make a new substance. A change in physical properties alone is not a chemical reaction, and changes in mass or volume are not the defining characteristics of a chemical reaction.

Answer:

1. C. make a paper airplane
2. D. ability to react with oxygen
3. A. there must be a change in chemical properties to make a new substance