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A student wants to determine the density of a plastic piece. Preliminary experiments indicate that the density of the plastic is greater than 0.85 g/ml, but less dense than water. In order to determine the density of the plastic piece, the student will form an aqueous solution having the same density as the plastic piece. Which of the following liquids should be mixed with water to form a solution having the same density as the plastic piece?
A. Alcohol B. Mineral Oil C. glycerol D. methylene chloride
Liquid
Density g/ml
Miscibility with water
Mineral Oil
0.85
Not miscible
Alcohol
0.78
Miscible
Glycerol
1.26
Methylene chloride
1.33
Sodium Carbonate (NaCO3) is available in very pure form and can be used to standardize acid solutions. What is the molarity of the HCl solution if 25.3 mL of the solution is required to react with 0.256 g of Na2Co3
Problem- Oxalic acid (H2C2O4) reacts with chromate ion in acidic solution as follows: 3H2C2O4 (aq) + 2CrO4 2- (aq) + 10 H+ (aq) = 6CO2 (g) = 2Cr3+ (aq) +8H2O (I) oxalic acid.
In Millikan's experiment, the charge on each drop of oil was measured in coulombs. Imagine the same experiment, however with charges measured in a fictitious unit called a zeet (z).
If ammonia is obtained in 90% yield based on hydrogen, how many tons of hydrogen are necessary to produce 100 Mg of ammonia
What is the empirical formula of a hydrocarbon if complete combustion or 5.900 mg of the hydrocarbon produced 19.201 mg of CO2 and 5.895 mg of H2O? Be sure to write C first in the formula.
Depict the resonance structure of the most stable carbocationintermediate possible that results from step 2 of an electrophilicaromatic substitution reaction when tert-butylbenzeneencounters bromine in the presence of iron(III) bromide.
Problem- The equilibrium constant, K, for a neutralization reaction can be symbolized as Kn. Using Kw, Ka, and Kb values, determine Kn for the following reaction at 25° C.
an unknown compound has the formula CxHyOz. you burn .237g of the compound and isolate .347g of CO2 and .142g of H20. if the molar mass o te compound is 30.03g/mol, what is the molecular formula?
The decomposition of N2O into N2 and O in the presence of gaseous argon follows second order kinetics with K= (5.0x10^11 Lmol^-1s^-)e^-29000K/T. What is the energy of activation of this compound
Suppose If 100.0 g of powdered infant formula contains 1.66 g of CaCl2, Explain how many calcium ions are in a solution of 40.0 g of powdered formula mixed with 0.710 L of water
Chemical changes be be both useful and destructive to humanitys purposes. Cite a few examples of each kind of change from your own experience. Also give evidence from observation that each is indeed a chemical change and not a phsycial change
A peptide with the amino acid sequence C-P=T-Y-R-L-D-Q (MW = 995.12 g/mol) is dissolved in this solution at a concentration of 5 micromol.
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