Zadanie 30
In a titration, the initial burette reading was 3.20 ± 0.05 cm3 and the final burette reading was 28.70 ± 0.05 cm3. What is the uncertainty associated with the volume of titrant added? A. ±0.00 cm3 B.…
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In a titration, the initial burette reading was 3.20 ± 0.05 cm3 and the final burette reading was 28.70 ± 0.05 cm3. What is the uncertainty associated with the volume of titrant added? A. ±0.00 cm3 B.…
A sample of ammonium sulfate, (NH4)2SO4, has a mass of 66.1 g. Mr = 132.17 How many moles of ammonium ions are present in the sample? A. 0.25 B. 0.50 C. 1.00 D. 1.50
The graph shows the boiling points of the straight-chain alkenes with a terminal double bond, from ethene to hex-1-ene. (i) Explain why the boiling point rises from ethene to but-1-ene. (ii) A sample of but-1-ene is warmed from 250 K to 300 K at constant…
Ethane reacts with bromine gas, Br2(g), in the presence of UV light to form bromoethane. (i) State the type of this reaction and the name of its mechanism. (ii) Explain the mechanism of this reaction by writing equations for one initiation step, two…
1-Bromopropane can be converted into propan-1-ol. Identify a suitable reagent and the conditions needed for this conversion.
Young mussels were placed in a contaminated harbour. Samples were taken at regular intervals and the tin content of the soft tissue was determined. (i) The tin content follows a linear trend during the first six weeks. Deduce the equation for this part of the…
The concentration of tin in a sample of mussel tissue is 0.0064 ± 0.0002 mg Sn g−1. (i) Calculate the mass of tin, in mg, in 2.416 g of the sample. (ii) Calculate the percentage uncertainty of the concentration.
Suggest two variables that should be controlled when mussels are collected and their soft tissue is sampled.
Antimony(III) sulfide burns in air to form antimony(III) oxide and sulfur dioxide. Sb2S3(s) + O2(g) → Sb2O3(s) + SO2(g) The equation is balanced using the smallest whole-number coefficients. What is the sum of all the coefficients? A. 8 B. 15 C. 19 D.…
In the solid state, calcium, Ca, and calcium chloride, CaCl2, are each built as a regular three-dimensional lattice. Predict the electrical conductivity of Ca(s) and of CaCl2(s), giving a reason for each.