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Calculate the weight of the watch glass and sample in grams if a 141-mg sample was placed on a watch glass that weighed 9,203g.
Explain why does never weigh a hot object? Illustrate the principle of conservation of matter? How could you separate a mixture of cyclohexane and zinc chloride?
Explain how could you separate zinc chloride from SIO2? Explain why is the NACL extracted with water three times as opposed to only once?
Point P(3,1) lies on curve y=sqrt(x-2). If Q is point(x,sqrt(x-2)) on curve, then slope of secant line PQ correct to 6 decimal places when x = 2.99 is?
A student found that her mixture was 20%NACL, 15% NH4CL and 75% SIO2. Explain what did she most likely do incorrectly in her experiment?
At an initial pressure of 6.00atm a gas, expands from 10.0 liters to 12.00 liters against a constant external pressure of 3.00atm and in calories: (11-atm=24.217cal)
Determine the molality of commercial HCL solution which is12.1M, has a density of 1.19 g/mL and is 37.2 wt% HCl.
Determine the number of atoms would you require to have a necklace 36 cm long if a gold atom has a radius of 145 pm and you could string gold atoms like beads on a thread.
Determine time (t) at which distance between A and B is minimal. Compute locations of particles A and B at this time, and label them on graph.
At 1200 degrees C a 1-mm sheet of FCC iron is used to contain the nitrogen in a heat exchanger. The concentration of N at one surfaces 0.04 atomic percent and the concentration at the second surface
Suppose the ideal gas behavior, determine the partial pressures and mole fractions of the gases (i) after the two gases react to form the maximum quantity of ammonia and (ii) initially.
The person leaves home and walks two miles west. She then walks 3 miles directly southwest. In what direction must she walk to travel directly home?
Under which circumstances is it wise to use a mixture of solvents to carry out a re-crystallization? If a little activated charcoal does a good job removing impurities in a re-crystallization, why not
Assume a compound is involved in three different reactions which is denoted as R1, R2, and R3. Tripling the concentration of this reactant in all three reactions causes the rates of reaction to incr
He sends out the car to catch truck. If truck travels at the average speed of 50 mph and car travels at 70 mph, how long will it take car to catch truck?
Suppose if your doctor has diagnosed you as being anemic, that is, as containing too little iron in your blood. At the drugstore, you get a two iron-containing dietary supplements, one with iron (II
At 800 K 100.0 m moles of HI are initially in a 1.00 L container. After 10.0 minutes the concentration reduces to 15.0000mmole/L. Calculate the average rate of production of H2 in m mole/L min
Length is twice the width. Material for base cost $10 per square meter and its sides price $6 per square meter. State cost as the function of containers width.
Estimate the temperature of the discharge gas if the ratio of the intensities of the lines originating from levels n = 3 and n = 4 is150/1 in the Balmer spectrum of a hydrogen discharge.
A cannon ball made of iron which is having the volume of 115 cm3. What is the mass of the cannon ball in kilograms if iron has a density of 7.86 g/cm3.
A physician has ordered 325 mg of atropine, intra muscularly, determine the number of milliliters would you require to give if the atropine were available as 0.50 g/mL of solution.
Determine the mass of NaCl which is necessary to add to 200ml of water (which is having the density of =1.0 g/mL) to make a 1 molality solution.
Calculate the freezing point depression of the solution and determine the molality of the solution and molar mass of the solute if a solution is organized by dissolving 138.50g of sucrose, a non-ele
Determine the numbers of molecules of NaCl are in 250 ml of a 5 mM solution? For each mole of substance there are 6.023 x1023 molecules (or number of that substance).
Determine the number of grams of NaCl would you require to add 500 ml of water to make a 5 % solution? Explain in detail.