Which statement best describes the use of a catalyst in a fuel cell? It reduces waste. It lowers energy requirements. It reduces toxic exhaust. It increases reaction rates.

Which of the following elements is less reactive than the others? Bromine (Br) Oxygen (O) Selenium (Se) Sulfur (S)

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond. What does this tell you about the strength of these two bonds? Multiple Choice The alkyne C-C bond is stronger. The alkene C-C bond is stronger.

Generally, as you go from left to right on the periodic table, what happens to: A) Atomic radius? B) First ionization energy? C) Electronegativity?

You have a gas stored in a rigid container (fixed volume). Explain the relationship between a decrease in temperature, collisions, and kinetic energy within the container.

Large pool of blood is found in the center of a room with a tile floor. There are zigzagging, arc-like bloodstains on one wall with drops of blood 1-4 mm in size and drips running down the wall.

What river basin provide river water to charolette and gastoia?

8. Calculate the molar mass of an alkane with the mole- cular formula C H18.

What is DNA? What information does it carry? Where is DNA located?

5. Differences in which property allow the separation of a sample of sand and seawater by filtration? A) concentration of ions B) volume of sample C) mass of sample D) particle size

Describe the reaction of a weak acid and a strong base. In general, what will the final pH be when the reaction between equal moles of a weak acid and a strong base is complete?