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Consider the following Balanced equation: SiO2+3C--->SiC+2CO: Complete the following table, showing the appropriate number of moles of reactant and products
A metal-plating waste contains 20mg/L Cu2+, and it is desired to add Ca(OH)2 to precipitate all but 0.5mg/L of the copper. To what concentration in moles per liter must the hydroxide concentration b
the following is the better chemical for removing calcium ions from water. Make sure you show the calculations necessary
The rate constant (k) for a reaction was measured as a function of temperature. a plot of ln k versus 1/T is line and has a slope of -7445K. Calculate the activation energy for the reaction
Pipette 10 mL of Reaction Mixture 1 into a 50 mL beaker. Pipette 1 mL of the KMnO4 into the Reaction Mixture, starting the stopwatch immediately.
Calculate the concentration given the absorbance. Each test tube has 5ml of water then a certain amount of bromol blue. 1 ul bromol blue absorbs at= 0.092, 2 ul=0.105, 4ul=0.093, 10=0.199, 20= .225,
The rate law for the reaction 3A ? 2B is rate = k[A] with a rate constant of 0.0447 hr-1. What is the half- life of the reaction
Calculate the total salt concentration (in mole litre-1) of a cup of soup assuming that both the sodium and potassium are added as chloride salts. What is the concentration of chloride in gram per 1
A 100 mL of a 0.100 M solution of vinegar (acetic acid, CH3COOH) is mixed with 100 mL of a 0.100 M baking soda (sodium bicarbonate) solution and a reaction proceeds that generates carbon dioxide, wa
An equilibrium mixture of PCl5,PCl3 and Cl2 at a certain temperature contains 8.3×10^?3M PCl5 , 1.5×10^?2M PCl3 and 3.0×10^?2M Cl2.
calculate the limiting reactant and excess reactant for the synthesis of methyl Orange. I'm not sure what reagents to use for my calculations
You are given an open-ended mercury manometer and asked to determine the pressure in a pipleline that supplies feed gas to a reactor. However, when you connect the manometer to the pipeline, you not
How do you find the HETP of a fractionating column given the areas after a gas chromatogram were cyclohexane 6286 and toluene 346. with a ratio being of cyclohexane/toluene.
A student attempted to identify an unknown compound by the method used in this experiment. she found that when she heated a sample weighing 0.4826 g, the mass barely changed, dropping to 0.4855 g.
The following equilibrium concentrations were measured at 800 K:[SO2]=3.0*10^-3M; [O2]=3.5*10^-3M; [SO3]=5.0*10^-2M. Calculate the equilibrium constant at 800K for each of the following reactions.
Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high, too low, or unaffecte
Which is the best description of hydrogen bonding? The temporary attraction between hydrogen atoms on different molecules resulting from shifts in electron density The association between a hydrogen
The change cannot be determined without more specific information. It will remain constant. It will decrease by a factor of 2. It will decrease by a factor of 4.
Two students prepare two cyclohexane solutions having the same freezing point. Student 1 uses 26.6 g of cyclohexane solvent, and student 2 uses 24.1 g of cyclohexane solvent. Which student has the g
How many moles of HCl are present in 35.5 mL of a 0.200 M solution? 2. A 50.0 mL sample of a 6.0 M solution of HCl is diluted to 200. mL. What is the new concentration
How many grams of O2 are contained in a 25.0 L sample at 5.20 atm and 28.0°C? 2. How many moles of gas are present in a 10.0 liter sample at STP? 3. How many grams are in 10.0 mEq of Ca2+?
An end-centered orthorhombic unit cell has a cereal-box shape with atoms at each corner and on the face of two opposite ends. How many atoms are in a unit cell
Using words and pictures, explain why impurities usually lower the melting point of a substance. Next, imagine a case where an impurity actually RAISES the melting temperature of a pure substance
Identical hard spheres of radius R are packed together to form a simple cubic lattice. What is the ratio a/R, where a is the edge length of the unit cell
An unidentified metal crystallizes in a body-centred cubic lattice with an edge length of 429 pm. The density of the metal is found to be 0.967 g/cm 3 . What is the identity of the metal