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which of the following are mixtures?
1. air (mostly n2 and o2) 2. salt (NaCl) 3. Salt Water 4. Water (h20
Germanium forms a substitutional solid solution with silicon. Compute the weight percent of germanium that must be added to silicon to yield an alloy that contains 4.43 × 1021 Ge atoms per cubic centimeter
Part A: Thymolphthalein is an indicator that changes color over a range from pH = 9.3 to pH = 10.5 . What is Ka of thymolphthalein. Part B: Alizarin yellow R, Ka=7.9x10^-12, is yellow in its protonated form (HX) and red in its ionized form (X-)
A 0.1276 g sample of a monoprotic acid (molar mass=1.10 x 10^2) was dissolved in 25 mL of water and titrated with 0.0633 M NaOH. After 10 mL of base had been added, the pH was determined to be 5.57. What is the Ka for the acid
given a stock solution of a food dye having a concentration of 1.0 x 10-5 and an absorbance of 0.700. if a new solution
in nature the element x consists of two naturally occurring isotopes. 107x with abundance 54.34 and isotopic mass
If 129 g of ice at 0.0°C is added to 2.48 L of water at 77°C, what is the final temperature of the mixture
What is the frequency of the photons emitted by hydrogen atoms when they undergo transitions from n=5 to n=3.
What masses of NaCl and water are needed to prepare 1000g of a solution that is 0.90% by mass
The calorimeter contains exactly 251 g of water as well as the temperature increases by 1.126°C. Compute the heat given off by the burning Mg, in kJ/g and in kJ/mol.
Write the expression for the equilibrium constant, Kc, for the following chemical reaction.
write the sequence of 5-oligonucleotide primers you will design to replicate the DNA sequence in question 1a by the polymerase chain reaction (PCR). Indicate the 5' and 3' ends of each primer. this is the DNA sequence
A mixture of propane and butane is burned with pure oxygen. The combustion products contain 47.4 mole% H2O. After all of the water is removed from the products, the residual gas contains 69.4 mole% CO2 and the balance is O2.
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