How many TOTAL resonance structures can be drawn for CO_(3)^2- (A) 3 (B) 4 (C) 5 (D) 2 (E) 1

8. Zinc (Zn), important for immune system function in humans, is also used to prevent rusting through the process of galvanization. How many grams of zinc are in 1.7 mol of Zn? (Show all of your work for full points) (2pt)

Identify the free radical. $OH^{+}$ $OH^{-}$ OH .OH

Part C: Mixed Practice (Polyatomic ions &Transition metals) 16. $NaNO_{3}$ 17. Calcium carbonate 18. $FeCl_{3}$ 19. $CuSO_{4}$ 20. Ammonium chloride

What makes saltwater a conductor? Molecular structure Low resistance Presence of ions High electron density

2. Writing the formula for the following compounds. a. Diphosphorous pentoxide b. Silicon tetrachloride c. Sulfur dioxide d. Nitrogen monoxide e. Diphosphorous trisulfide f. Hydrogen bromide

Is this equation balanced? $1Au2S3+3H2-- \gt $ $2Au+3H2S$ No Yes

How many moles of $CO_{2}$ are produced when (.110 mol of $O_{2}$ reacts? Express your answer to three significant figures and include the appropriate units. $n(CO_{2})=Value\quad Units$

Which of the following is an example of an actual hybrid orbit? $sp^{3}$ $sp^{4}$ $dp^{3}$ $d^{2}s$

3/10 The most reactive halogen is $\square $

4. Which of the following is a chemical change? freezing liquid mercury evaporation of water sublimation of iodine combustion of liquified petroleum gas