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Below are five statements about the temperature dependence of a reaction rate constant K. Which one statement holds true for most chemical reactions?
1) increases with temperature, mainly because there are fewer collisions per second.2) increases with temperature, mainly because a higher proportion of the collisions are energetic enough to produce reaction.3) decreases with temperature, mainly because of the decrease in effectiveness of the attractive long-range intermolecular forces.4) does not change with temperature.5) increases or decreases with temperature, depending on whether the reaction is endothermic or exothermic.
10 ml of .1 M phosphoric acid is titrated with .1M NaOH. After 10 ml of NaOH has been added the pH is 4 What is the ratio of H3PO4/H2PO4 - at this point
How many photons strike the CD surface during the playing of a CD 69 minutes in length?
The normal melting point of benzene is 5.5 degrees Celsius . For the process of freezing, what is the sign for each of the following: a) Delta Hsys b) Delta Ssys c) Delta Gsys at 5.5 degrees Celsius d) Delta Gsys at 0 degrees Celsius
A voltaic cell consists of an Au/Au3+ electrode (E° = 1.50 V) and a Cu/Cu2+ electrode (E° = 0.34 V). Calculate [Au3+] if [Cu2+] = 1.20 M and Ecell = 1.13 V at 25°C.
how many milliliters of 0.105 m hcl are needed to titrate each of the following solutions to the equivalence point--
Describe the preparation of 0.250 L of 50.0 mM lactate buffer, pH 4.5 using a 0.5 M solution of lactic acid and 0.5 M solution of sodium lactate. pka=3.9
What will be the final temperature of a 437-g sample of water, initially at 15C, after 52.2 kJ have been added to it
What statement below best describes the graph representing the integrated 1st order rate law. plot of ln[a] vs t having a straight line negative slope equal to -k
identify the two important classes of catalysts. analyze the chemical reactions that take place when a biological
A piece of metal with a mass of 151 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 35 mL. What is the density of the metal?
hydrogen gas is generated when calcium reacts with water. the volume of gas collected over water at 30 degree celcius and pressure of 988 mm Hg is 641 ml. what is the mass in grams of the hydrogen gas obtained? the pressure of water vapor at 30 de..
You are asked to prepare an aqueous solution of ethylene glycol (HOCH2CH2OH) with a mole fraction of 0.142.
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