In his chemistry lab David is experimenting with how NaOH and HCl gas reacts with each other. He conducted two experiments, experiment A and experiment B. In experiment A he used solid pellets of NaOH, but in experiment B he used ground NaOH. He was surprised to see the difference it made in his experiment. Would experiment B have higher or lower reaction rate than experiment A?
Ans: higher

Dan had two children: Karen which had sickle-cell anemia, and his son Bob, which was healthy. Which child has a hemoglobin that gives rise to the crescent-shaped cells?
Ans: Karen

Tree city and Leaf city were the two biggest cities in Boulderland. Tree city burned lots of gas and other fossil fuels, while Leaf city was very protective towards its environment. Which city exposed more people to asthma?
Ans: Tree

Two brothers were land owners. Bill owned 40 acres of forest, , with very well developed soil. His brother Rick owned 40 acres of grasslands, with a poor soil. Rick decided to sell his land. Which brother owned a land which showed an excess of water that percolates downward through the soil layers?
Ans: Bill