Consider the burning of gasoline and the evaporation of gasoline. which process represents a chemical change and which represents a physical change?

The salt sodium sulfate, Na2SO4, can be formed by a reaction between ... a. NaOH and HCL. b. NaCl and H2O. c. NaOH and H2SO4. d. NaCl and NH3.

What gives the gem amethyst its purplish color? A. Oxygen B. Quartz C. Iron D. Titanium

When NADH donates two electrons to ubiquinone during respiration, ubiquinone isa. reduced. b. oxidized. c. phosphorylated. d. aerobic. e. hydrolyzed.

Astronomy is one of the oldest sciences. True False

Beryllium has a nucleus composed of protons and neutrons. Given the data, how many protons are in a typical Beryllium nucleus? A) 3 B) 4 C) 5 Eliminate D) 9

What was your relative pH for bleach? This means there were ___ moles of PH - ions present in bleah.

Which is an example of an energy transformation? (A) a soccer ball sitting in a field. (B) a person waiting at a crosswalk. (C) an unlit candle. (D) a boulder falling off a tall cliff.

The two major groups of dinosaurs during the Jurassic Period were the saurischians and the A) pterosaurs. B) ichthyosaurs. C) ornithischians. D) herbivores.

There are a few ways to increase the rate of a reaction. When the amount of a substance in a given volume is increased, this is altering the

What can the student predict if she finds the mass of the whole candy bar, including the wrapper?