A) Substance A is put into a glass jar. It expands to fill all the available space. Substance A is:

What material does not melt at any temperature

Enzymes affect the reactions in living cells by changing the

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.