Question

1. you volunteer for chalkboard cleaning duty and you get to work with the erasers. as you rub the dust off of the chalkboard, white chalk dust enters the air and makes you cough. as you clean the chalkboard with the eraser, are you causing a physical change or a chemical change? explain your answer.

Explanation:

A physical change is a change in which no new substances are formed. When cleaning the chalkboard with an eraser, the chalk dust is just broken into smaller pieces and dispersed in the air. The chemical composition of the chalk (usually calcium carbonate or calcium sulfate) remains the same. There is no new substance generated during this process.

Answer:

Physical change. Because when cleaning the chalkboard with the eraser, only the state and distribution of the chalk (no new substances formed) change.