Prelab quiz - e9 - quantification of iron started: nov 3 at 2: 35pm quiz instructions prelab quizzes must be completed and submitted no later than before your scheduled lab. a completed and submitted prelab quiz is a requirement to attend lab. the prelab quizzes replace the prelab questions. due date listed only represents the last date the quiz is available to all students; ie, last day of round robin experiments. the quizzes have 10 questions, with 5 multiple choice and 5 true false. there is no time limit on the quizzes, however after you answer a question you may not go back to that question. on question 10 be sure to "submit for grading" (entering save, does not enter the grade into the gradebook). when you enter submit for grading, be sure to enter to hit submit for grading a second time as prompted. question 32 pts the concentration of hcl used for this experiment is a. 6.0 m b. 2.0 m c.1.0 m d. 12.0 m

The biosphere of the earth is made up of what compound? organic or inorganic?

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration of 250 mm and a ph of 5. what concentrations of acetic acid and sodium acetate should you use