The reactants in a chemical reaction contain 900 j of chemical energy. the products of the reaction contain 9000 j of chemical energy. which statement best describes this chemical reaction? the reaction absorbs 9000 j of energy from the surroundings as it proceeds. the reaction releases 9000 j of energy to the surroundings as it proceeds. the reaction absorbs 8100 j of energy from the surroundings as it proceeds. the reaction releases 8100 j of energy to the surroundings as it proceeds. the answer is c

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

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that

What is the formula of the ionic compound composed of calcium cations and chloride anions