4 Al + 302 → 2 Al2O3 -
If 10.71g Al are exposed to plenty of oxygen, what mass of Al2O3 is
produced?
k

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

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.