QUIZ PROBLEM #5 Instructions:  Type your answer to the question in the textbox below. Show all work on your “work” page.  Label which problem it is (#5). Question: What is the molarity of sodium sulfide in a solution prepared by dissolving 2.31 g of Na2S in enough water to make 64.5 L of solution?

QUIZ PROBLEM #1 Instructions:  Select your answers from the dropdown lists. There is no need to write anything on your “work” pages.  But if you do, include that with your scanned pages that you submit later. Questions: For each of the chemical equations shown, indicate: Whether or not the equation is balanced. Which type of reaction it is. Chemical Equations: A.  2 Fe(OH)2 (s)   –>   2 FeO (s)  +  H2O (l) Is this equation balanced?  [balance1] Which type of reaction is this?  [rxn1] B.  2 C4H6 (l)  +  11 O2 (g)   –>   8 CO2 (g)  +  6 H2O (g) Is this equation balanced?  [balance2] Which type of reaction is this?  [rxn2]

The next three problems (#2-4) are asking the same question for three different compounds.

In acid-base balance, the normal PCO2 and HCO3 levels are disturbed.  Match the changes in these imbalances with the correct disorder:  Increased PCO2 levels.

QUIZ PROBLEM #4 Instructions:  Type your answer to the question in the textbox below. Show all work on your “work” page.  Label which problem it is (#4). Question: You mix 185 mL of a calcium chloride solution with enough water to create 4.25 L of a solution that is 0.263 M in CaCl2. What was the molarity of the original calcium chloride solution?

QUIZ PROBLEM #3 Instructions:  Type your answer to the question in the textbox below. Use the T2 button to format subscripts.  Remember to turn it on, then turn it off. Show all work on your “work” page.  Label which problem it is (#3). Question: An unknown compound is found to have the following composition, by mass: 15.8% Al 28.1% S 56.1% O What is the empirical formula for this compound?

QUIZ PROBLEM #3 Instructions: Choose the ONE best answer to the question. There is no need to write anything on your “work” pages.   Question: Some CrBr3 is added to a beaker of water and it dissolves.  This compound is a strong electrolyte. Which one of the following diagrams best represents this mixture at the atomic level?  Note:  “W” represents a water molecule.

The midterm is on ______.   The month (as an integer 1 for January …): [m1] The day (as an integer 1 for the first day of the month …): [d1]

QUIZ PROBLEM #1 Instructions: Choose the ONE best answer to the question. There is no need to write anything on your “work” pages. Question: According to kinetic molecular theory, for molecules at the same temperature, is random motion faster for molecules with a larger or smaller mass?  

QUIZ PROBLEM #6 Here is a molecular equation: 3 Sn (s)  +  2 AuBr3 (aq)   –>   2 Au (s)  +  3 SnBr2 (aq) Instructions: On your “work” page, write the two equations described here.  Label them 6A or 6B. A.  Write the balanced total ionic equation for the reaction shown above. B.  Write the balanced net ionic equation for the reaction shown above. Type the answers to these questions in the textbox below.  Label them C or D. C.  What is oxidized in this reaction?  How can you tell?  Be specific. D.  What is reduced in this reaction?  How can you tell?  Be specific.