Which of the following correctly identifies the number of each element involved in the chemical formulas? NH4 CO3 A N: 4 H: 4 С: 3 0: 3 В N: 1 H: 1 C: 1 O: 3 C N: 0 H: 4 C: 0 0: 3 D N: 1 H: 4 C: 1 0: 3
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- The pH of a 1.25 x10-3 M NaOH solution is: a 7 2,90 3.10 d 11.10 O e 10.90Which of the following has the compounds shown in the correct order of decreasing acidity (i.e., more acidic > less acidic)? OH 2>1>3 3 > 21 1>3>2 1 2 3 ΝΗΣ 2 3An aqueous solution contains 0.34 M potassium cyanide. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) 0.34 mol HCI04 0.16 mol NaOH 0.33 mol KCIO4 0.16 mol HCIO4 0.33 mol HCN
- A patient’s treatment plan requires two IV solutions to be administered:20% magnesium sulfate, MgSO4, and 10% calcium chloride, CaCl2. Thenurse is concerned, MgSO4 and CaCl2 are listed as incompatible IVsolutions with the risk of solid precipitate formation (image shown toright). Write the chemical equation that predicts the products thatform when combining MgSO4 and CaCl2. Please use the providedsolubility chart to help you determine chemical phases.Estimate the pH of a 7.18 x 106 M HF solution. You can calculate the lowest possible pH, knowing that the actual value will be higher. Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs. pH will be above Select the solution with the highest pH. Multiple Choice 0.0225 MLIOH 0.0225 MH2CO3 0.0225 MCH3NH2You are told to prepare 200 mL of fixative solution containing 30% formaldehyde (vol/vol), 1X glycerol and 2.5 mM sodium chloride (NaCl). You find a stock of 100% pure formaldehyde (liquid), a 10X glycerol stock (liquid), plenty of water and a stock solution of 5M NaCl. There are also all kinds of pipettes, cylinders and beakers to measure volumes. How can the fixative solution be made (describe the process, include calculation concepts)?
- eriences the electrostatic field of another nighly electronegative atom nearb 18. Put the following in the correct order to describe the pattern of disease: period of convalescence, prodromal period, period of decline, incubation period, and period of illness. In which of these stages is the sick person capable of infecting other people DFocus 582 words English (Canada) 112 prt sc ho VAA ts - 17 144 & 2$4 4. 6. 7. 1/2 314 1/4 2 01 60 C0 %24Trans-oleic acid (18:1,D9) has a melting temperature of (44.5C) and cis-oleic acid (18:1,D9) has a melting point of (13.4C). Briefly explain the difference in melting points between the two.The substance oxygen has the following properties: normal melting point: 54.8 K normal boiling point: 90.2 K triple point: 1.50×10-3 atm, 54.4 K critical point: 49.8 atm, 154.6 K A sample of oxygen is initially at a pressure of 58.9 atm and a temperature of 96.9 K. The pressure on the sample is reduced to 1.50×10-3 atm at a constant temperature of 96.9 K. Which of the following are true?Choose all that apply The sample is initially a liquid. The gas initially present will solidify. The final state of the substance is a gas. One or more phase changes will occur. The final state of the substance is a solid.
- At blood pH 7.4 the molar ratio of bicarbonate and dissolved CO2 is: Group of answer choices 20 to 1 4 to 1 1 to 4 1 to 20When using an Indirect Ion Selective electrode: The measurement will not suffer interferences from lipids The measurement will not suffer interferences from proteins The sample will be analyzed without a dilution The sample will be analyzed after a dilutionYou are supplied with the following: / Jy word voorsien van die volgende: NaCl (Mr= 58,443 g /mol) 2.5M Tris-Cl, pH 8 solution /oplossing (1 Litre) EDTA (Mr= 380,2g/mol) 10% sodium dodecyl sulphate solution / natriumdodecyl sulfaat oplossing Proteïnase K solution / oplossing (50 mg dissolved / opgelos in 1 ml ddH2O) You need a digestion buffer consisting of the following: / Jy moet 'n verteringsbuffer op maak wat uit die volgende bestaan: 15m M NaCl 75 mM Tris-Cl,pH 8 16 mM EDTA,pH 8 0.8% sodium sulphate / natrium dodecyl sulfaat 0,75 mg/ml proteïnase K How will you prepare 500 ml of the digestion buffer? Show all your steps and calculations. Remember to explain exactly how you will make it up. / Hoe sal jy 500 ml van die verteringsbuffer voorberei? Wys al jou stappe en berekeninge. Onthou om te verduidelik presies hoe jy dit sal op maak.What is the empirical formula for C3H6O3? C3H6O3 C6H12O6 CH2O None of these
