Clicker #1 Astronauts undergo some of the most rigorous training ever conceived. They must be able to perform dangerous work while hurtling through space, all without throwing up. China is after only the best of the best for its space program, so candidates are tested for what? A) Hand-eye coordination B) Bad breath C) Sobriety D) Parallel parking skills Source: Wait Wait…Don’t Tell Me! Daily News Quiz, 8/6/09

Clicker #2 How many of the following are compounds? S8, NO2, KCl, CH4, H2SO4 A) 1 B) 2 C) 3 D) 4 E) 5

Clicker #3 How many of the following are compounds? S8, NO2, KCl, CH4, H2SO4 A) 1 B) 2 C) 3 D) 4 E) 5

Clicker #4 How many of the following are examples of a chemical change? I. pulverizing (crushing) rock salt II. burning of wood III. dissolving of sugar in water IV. melting a popsicle on a warm summer day A) 0 B) 1 C) 2 D) 3 E) 4

Clicker #5 Which of the following is a homogeneous mixture? A) potting soil B) sodium chloride (table salt) C) pure water D) oil and vinegar dressing E) sports drink (like Gatorade) Note: I did not get to this in lecture but I’m posting this anyway for practice.