Best Rated Vacuums
Best Rated Vacuums
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Thermos Foogo Leak-Proof Stainless Steel 10-Ounce Food Jar, Pink
$9.75 Ideal for keeping meals deliciously hot or refreshingly cold while you're on-the-go, the Thermos Foogo Phases Vacuum Insulated Food Jar (10 Ounces, Pink) offers superior insulation technology. Compact and portable, the Food Jar features a wide-mouth design, providing easy access for eating directly out of the jar. The TherMax double-wall vacuum-insulation keeps food cold for seven hours or hot for... |
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Thermos Stainless King SK3000MBTRI4 Food Jar, Midnight Blue
$18.99 Thermos SK3000MB4 Food Jar SK3000MB4 Thermos... |
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Thermos Stainless King SK1005MB4 16-Ounce Leak-Proof Travel Mug, Midnight Blue
$18.95 Thermos SK1005MB4 Thermos SK1005MB4 Thermos... |
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Who's Minding the Store [VHS]
$9.95 ... |
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Black & Decker CHV1410 Dustbuster 14.4-Volt Cordless Cyclonic Hand Vac
$35.50 Russell Hobbs CHV1410 Portable Vacuum Cleaner CHV1410 Vacuum Cleaners... |
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Emergency Sleeping Bag, Survival Bag, Emergency Zone® Brand, Reflective Blanket
$3.99 Emergency Zone® Brand. The Emergency Sleeping Bag is made of the same Mylar material as our emergency blanket but is formed into a sleeping bag to prevent heat loss even more efficiently. The bag retains 80 percent of body heat and is wind and waterproof. The bag measures 36 x 84 inches.... |
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Toro 51599 Ultra 12 amp Variable-Speed Electric Blower/Vacuum with Metal Impeller
$74.97 Powerful and effective, the Toro Ultra 3-in-1 Blower, Vacuum, and Leaf Shredder makes completing yard work fun and easy. With air speeds up to 235 mph, this electric blower nevertheless is lighter, quieter, and cleaner than similar gas blowers. And with a sleek, ergonomical design, it's a tool that is easy to use and will grab your neighbors' attention. .caption { font-family: Verdana, Helvetica... |
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Nosefrida The Snotsucker Nasal Aspirator
$12.95 ... |
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Remington MB-200 Titanium Mustache and Beard Trimmer
$23.95 Remington MB-200 Precision Titanium Mustache & Beard Trimmer is an adjustable beard groomer features nine length settings and Titanium coated blades that are strong, durable and long-lasting. The beard groomer's self-sharpening blades always stay sharp, always stay precise. This is the perfect tool for any beard, allowing you to trim, detail, edge and shape. The all-in-one unit features built-in c... |
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Philips Norelco NT9110 Precision Nose and Ear Trimmer
$14.99 The NT9110's Tube Shave technology makes nose and ear hair trimming safe, fast, and easy. The ultra sharp, closed cutting system avoids pulling for a more comfortable trimming experience. The guarded system also protects against nicks and cuts. This unique and patented tube technology integrates a miniature trimming head for increased visibility, maneuverability and precision.... |
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D4 Rainbow Vacuum Cleaner Power Nozzle Assembly
$159.95 |
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One New Eureka 4700D Bagless Upright Vacuum Cleaner NIB
$78.99 |
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Shop-Vac 9609910 6.5 Peak HP 14-Gallon Vacuum Cleaner
$359.99 |
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Dust Care Cordless Bare Hard Floor & Carpet Sweeper Cleaner Vacuum
$24.00 |
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Oreck Vacuum Model XL 2600 HH, Cleaning, Oreck, Cleaners, OreckXL, Oreck XL
$56.99 |
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Used KIRBY Generation 4 G4 G 4 Upright Vacuum Cleaner with Attachments Sweeper
$149.99 |
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Robotic Vacuum Cleaner Sweeper Intelligent New
$56.00 |
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Filter Queen vacuum cleaner Charcoal Filter Cone cones
$29.99 |
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NIB SWIVEL SWEEPER G2 CORDLESS VACUUM CLEANER G2VACUUM.
$18.00 |
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NIB SWIVEL SWEEPER G2 CORDLESS VACUUM CLEANER G2VACUUM.
$20.50 |
How can you find the heat of vaporization of water according to the experimental values given?
Scenario:
A beaker of 300mL of water at 64 degrees Celsius is placed into a vacuum bell. Pressure is relieved and the substance is allowed to boil. When the bell is removed there are 284mL of water left and the temperature is 44 degrees Celsius.
Problems:
Assuming that there was no heat lost or gained through a temperature difference of the remaining air inside the bell jar during the time of boiling and that the rate of cooling and boiling was constant,
1. Explain the drastic change in temperature of the water.
2. Calculate the heat of vaporization of the water in cal/gram according to the energy change of the water that was evaporated.
I don’t have a calculator handy, but I’ll help where I can.
Evaporation is endothermic, meaning that it takes in heat. The amount of heat taken in when one mole of water evaporates is its molar enthalpy of vaporization.
So, first, find out how much of the water evaporated. Assuming standard conditions, 1 mL of water weighs 1g. So that means that 16g of water evaporated. (With me so far?) Now use that to find out that you have a bit less than on mole of water vapor.
Where did the energy that the evaporating water use come from? The other molecules of water. You know that the amount of energy released when 284g of water decreases temperature is related in the formula q=mC(Tfinal-Tinitial). (Only the other 284g of water decreased temp…the other 16g gained temp.) Now you can figure out how much energy the water vapor absorbed when it changed into a gas.
Take the energy # and divide by the # of moles… and you are set.
Oh side note: since you are dropping the pressure, you do not need to worry about heating the water up inorder to make it boil.
Tags: best rated vacuums 2009, best rated vacuums for pet hair, best rated vacuums under 200