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.  

Select ALL of the following plant cell organelles which contain DNA

QUIZ PROBLEM #5 Instructions: On your “work” page, write molecular, total ionic, and net ionic equations for the aqueous reaction between these two compounds: Mn(ClO4)3  and  KOH Label which problem it is (#5). Clearly label your final answers for all three equations, which should all be balanced. Type an X in the textbox here when you are finished so Canvas will mark the question as answered.

QUIZ PROBLEM #7 Instructions:  Type your answers to the following questions in the textbox below. Label each answer by its part:  A or B. Show all work on your “work” pages.  Label which problem it is (#7).   Questions: Consider this reaction:   2 Ag2O (s)   –>   4 Ag (s)  +  O2 (g)               ΔH = +62.10 kJ A.  Is heat absorbed or released by the system in this reaction?  (no explanation needed) B.  How many kilograms of silver oxide must react for 916 kcal of heat to be transferred in this reaction?

QUIZ PROBLEM #6 Instructions: For each of the terms provided, select the one phrase from the list below that BEST defines the term.  No phrases will be used more than once. Not all phrases will be used. There is no need to write anything on your “work” pages Choose which one of these phrases best defines each term provided below: (1)  The final temperature minus the initial temperature. (2)  The amount of heat absorbed or released by a chemical reaction when the pressure remains constant. (3)  The kinetic energy the particles of a substance have due to their random motion. (4)  The potential energy within the particles of a substance due to the relative positions of electrons and protons. (5)  The total energy within all the particles of substance. (6)  The type of chemical reaction that causes the beaker in which it takes place to get warmer. (7)  The type of chemical reaction that causes the beaker in which it takes place to get cooler. (8)  A quantity or property whose value depends on the amount of substance present. (9)  A quantity or property whose value does not depend on the amount of substance present. (10)  A quantity or property whose value depends on the current conditions, not on the pathway to get there.   Terms:

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: A 10.0 liter glass bottle contains 0.361 moles of helium gas and an unknown amount of krypton gas at 663 K.  No chemical reaction occurs.  The total pressure inside the bottle is 4.25 atm. How many moles of krypton are in the bottle?