If 45.0g Al and 62.0g O2 react and 59.5g of Al2O3 are formed what is the percent yield

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.