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what is the final temperature once thermal equilibrium is reached. c) how much ice remains once thermal equilibrium is reached.
A 1.50 g sample of solid NH4NO3 was added to 35.0 mL of water in a styrofoam cup (insulated from the environment) and stirred until it dissolved. The temperature of the solution dropped form 22.7 C
When a piece of metal is irradiated with UV radiation (wavelength = 162 nm), electrons are ejected with a kinetic energy of 5.96*10^-19 J. What is the work function of the metal? (in joules)
What is the pH (to nearest 0.01 pH unit) of a solution prepared by mixing 87.0 mL of 0.0601 M NaOH and 71.0 mL of 0.0138 M Ba(OH)2
Calculate the energy in joules required to ionize a hydrogen atom when its electron is initially in the n = 4 energy level.
Elemental phosphorus reacts with chlorine gas according to the equation: P4 (s)+ 6Cl2 (g) --> 4PCl3 (l) A reaction mixture initially contains 45.11 g P4 and 132.0g Cl2. Once the reaction has occu
A standard method for the determination of glucose in serum is reported to have a standard deviation of 0.40 mg/dL. If s = 0.40 is a good approximation of lower case sigma
What is the subshell corresponding to the following sets of quantum numbers. An example of a subshell is 2s. A) n=3,l=2 b) n=3, l=1
Draw the correct molecular geometries of the following covalent compounds. Use the electronegativity differences between the atoms in each bond pair to determine the presence and direction of indivi
What is the pH at 25 deg celcius of the solution obtained by dissolving a 5.00 grain tablet of aspirin in 0.500L of water? The tablet contains 5.00 grains or 0.325g of acetylsalicylic acid HC9H7O4.
Which reaction mechanism, SN1 or SN2, is favored when NaI in acetone is used as the reagent for substitution reactions. Explain in some detail-consider solvent, nucleophile, and substrate structure.
What mass of silver bromide will form when 25.00 mL of a 0.0675 M MgBr2 solution is combined with 30.00 mL of 0.100M AgNO3
what happens to Fe+SCN=FeSCN when water is added. which way is the equilibrium shift and why. why does the color intensity increase
Use the Solubility Rules to write the dissociation equation when the ionic compounds are placed in water. If substances do not dissolve, state "no reaction" 1) magnesium chlorate
Draw Lewis structures to determine which of the following compounds exhibit resonance. Enter the letters corresponding to all those compounds which exhibit resonance
10.0 mL sample of aqueous HCL requires 32.34 mL of 0.108 M NaOH to reach the endpoint. What is the molar concentration of HCL. the equation for reaction is NaOH+HCl ..... NaCl + H2O
Using the table of polyatomic ions, write the correct chemical formula for the following ionic compound. Use the Solubility Rules to write the dissociation equation when the ionic compounds are plac
What is the pH of 30.00 mL of 3.45x10¡7 M 2-Oxopropanoic acid. (Note: any higher order polynomials must be reduced to at least a quadratic.)
how many moles of malic acid (C4H6O5) would this contain? d) Using the reaction stoichiometry for the chemical reaction of malic acid with NaOH (aq) shown in your lab manual, calculate how many mL o
Calculate the percentage of the principal basic component in the sample (That is, the component that is present in the largest percentage. You will need to determine which species are present and ca
calculate how many mL of 0.200 M NaOH (aq) would be needed to react with the malic acid sample from step c.
what is the purpose of the trail titration. describe the endpoint of the a titration. how will you know when you have reached it. explain why the walls of the flask are washed with distilled water d
The following molecules (ax4y2) all have an octahedral geometry. Select the pairs that contain identical molecules
what happens to NH3+H2O=NH4+OH when you add NH4Cl?. what type of change is this, which way is the equilibrium shift, and please explain.
When a strontium salt is ignited, it burns with a red flame. The frequency of the light given off by this flame is greater than