Aluminum will react with sulfuric acid in the following reaction.

2Al(s) + 3H2SO4(l) → Al2(SO4)3(aq) + 3H2(g)

a. How many moles of H2SO4 will react with 18 mol Al? ans: 27 mol H2SO4

b. How many moles of each product will be produced?

ans: 27 mol H2, 9 mol Al2(SO4)3

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

What is the independent variable in this investigation? mass volume sample number substance density

What is true for a substance that releases energy