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Solve the system using elementary row operations $6x + 4y - 3z = 26$ $-x - 6y + 6z = 1$ $-6x + y - 4z = -31$ How many solutions are there to this system? A. None B. Exactly 1 C. Exactly 2 D. Exactly 3 E. Infinitely many F. None of the above If there is one solution, give its coordinates in the answer spaces below. If there are infinitely many solutions, enter z in the answer blank for z, enter a formula for y in terms of z in the answer blank for y and enter a formula for x in terms of z in the answer blank for x. If there are no solutions, leave the answer blanks for x, y and z empty. $x = \frac{120}{241}$ $y = \frac{3}{8}$

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Air “breaks down” when the electric field strength reaches , causing a spark. A parallel-plate capacitor is made from two electrodes. How many electrons must be transferred from one electrode to the other to create a spark between the electrodes?

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If Fed wishes to stimulate the economy, it could 1.I. Buy U.S. government securities 2.II. raise the discount rate. 3.III. kower reserve requirments

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Problem 14: Use Venn diagrams with two sets A and B like the one shown below to answer the questions below. Remember to show all work (i.e. shaded Venn diagrams) for full credit. a) Which region(s) is/are represented by $A \cup B'$? b) Which region(s) is/are represented by $(A' \cap B)'$? c) Based on your answers to (a) and (b), are $A \cup B'$ and $(A' \cap B)'$ equal for all sets A and B?

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2. $ 2 s(s-4) $, find each indicated product.

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Selective serotonin reuptake inhibitors (SSRIs) inhibit the reuptake of serotonin, meaning that serotonin O decreases in the synaptic cleft. O increases in the synaptic cleft. O increases in presynaptic cells. O is enzymatically inactivated.

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Question 4: [25 marks] Styrene (for making polystyrene) is synthesized from ethylbenzene and must be separated from unreacted ethyl benzene. One way is to use liquid-liquid extraction with the solvent ethylene glycol. This three component system forms a two phase mixture as illustrated in Figure Q4. For illustration purposes suppose that the feed to the system contains 100 kg/h of 70 wt% styrene (A) in ethylbenzene (B). The solvent for the extraction, ethylene glycol (C), contains 5 wt% ethylbenzene (no styrene). It is desired to produce a raffinate stream with only 55 wt% styrene in one ideal stage. a) Sketch this process and clearly label the streams including the values given in the question. b) What are the concentrations of all three components in the exiting raffinate and extract streams? c) Determine the flow rates of the solvent stream, the extract and the raffinate. d) Calculate the recovery of styrene into the extract stream.

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What are possible preparation errors that can cause sample to be out of specification on 1M HIBA solution to be analysed on the HPLC.

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(4 points) Evaluate the following expressions. (a) \log_9 9^{15} = (b) \log_2 32 = (c) \log_5 125 = (d) \log_8 8^6 =

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2-8. (Mihelcic #3-23) The concentration of carbon dioxide (expressed as a partial pressure) is $10^{-3.5}$ atm. The temperature is 20 °C. What is the molar concentration (mole/L) of dissolved carbon dioxide in rainwater? 2-9. (Mihelcic #3-40) Hexachlorobenzene (HCB) is one of ten common pollutants being monitored by the International Joint Commission for Great Lakes Research. HCB has a log $K_{ow}$ of 5.5 ($K_{ow} = 10^{5.5}$), while benzene has a log $K_{ow}$ of 2.1. If these two compounds were found in equal concentrations in the waters of the Great Lakes, which do you expect to be present in higher concentrations in fish? Why?

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f-tima o.