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A) Many first aid kits include an instant could pack. A cold pack utilizes a chemical reaction that has a significant change in energy in order to make the pack feel cold. EXPLAIN which type of reaction an endothermic reaction or an exothermic reaction, would be most useful for making a cold pack.
B) HCl is a strong acid, and NaOH is a strong base. Neither substance should be poured down the drain because they are corrosive. Considering the chemical equation for the reaction between these two substances, why do you think it is okay to pour the contents of the reaction mixture down the sink?
C) Discuss whether aspirin in the form of a tablet or a powder would be more efficient at quickly relieving a headache. Support Answers, if possible, using experimental evidence.
Oxygen gas can be generated by the decomposition of potassium chlorate according to the following equation: 2KClO3(s) = 2KCl(s) + 3O2(g). How many liters of oxygen at STP will be produced when 0.216 kg of KCl is also produced
Calculate the molar solubility of Pb(IO3)2 in water by systematic method. {ksp for Pb(IO3)2 = 2.5 x 10^-13}
Express the second law of thermodynamics as a mathematical equation. In a particular spontaneous process the entropy of the system decreases.What can you conclude about the sign and magnitude of ?Ssurr?
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all atoms in the correct structure for NH4
Bisphenol A is an important component of many polymers, including polycarbonates, polyuethanes, and epoxy resins. It is synthesized from phenol and acetone with HCl as a catalyst. Propose a mechanism.
Treatment of (S)-( )-5-methyl-2-cyclohexenone with lithium dimethylcuprate gives, after protonolysis, a good yield of a mixture containing mostly a dextrorotatory ketone A and a trace of an optically inactive isomer B
(a) How long does it take to grow 800 nm thick oxide layer in a dry oxidation environment at 800 C. (b) What happens if we increase the temperature to 1200 C
What are the selected properties of the selected atom zinc and its most common ion
In a study of the effect of temperature on halogen decomposition. 0.50 mol of I2 was heated in a 2.5 L vessel and the following reaction occurred. I2 (g)--> 2I (g)
If a minimum energy of 2.00x10^5 J/mol is needed for this process, what is the minimum energy needed from each photon? B. Calculate the wavelength of light necessary to provide photons of this energy
Some aromatic compounds also undergo nucleophilic substitution, propose a mechanism for this reaction and indicate what types of substituents would be expected to be most reactive
Bromine has P vap= 400mm at 41.0 Celsius and a normal boiling point of 331.9K. Explain what is the heat of delta H vap of bromine in kilojoules per mole. In P2/P1=- delta H vap/R ( 1/T2- 1/T1)
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