Pb (NO3) 2 10. A compound is 42.3 % C, 5.94 % H, 32.9 % N, and 18.8 % O and has a molecular mass of 425.25 g/mol. Calculate the empirical and molecular formula. C15H25N10O5 11. How many moles of Al2O3 are produced by the reaction 200. g Al?
(1 point for each molecule) There are four atoms bonded to the central atom. 3. How many lone pairs of electrons are on the central atom? (1 point for each molecule) There are no lone pairs of electrons on the central atom. 4.
The center-most part of an atom where the protons and neutrons 5. The weighted average mass of an element’s isotopes of that element 4. The smallest particle of an element that retains the properties 3. High-energy radiation that has no charge and no mass of neutrons 2. Atoms with the same number of protons but different numbers 1.
Describe how raid 1 works and its advantages/disadvantages? Page 110 Raid 1 advantage is if one disk fail , the data can be recover from the second disk. The disadvantage is by using this mirror, it only provides half as much storage space. 7. Which file system is most commonly used with Windows 7.
Why should air velocity in branch ducts be limited to 600 fpm? (57.13) If air moves faster than 600 fpm it begins to make noise. 10. Why are duct friction charts designs for sheet metal not accurate for fiberglass duct board or flexible ducts? (57.11) Most duct friction charts are designed for sheet metal not fiberglass or flex duct.
The hard disk works sort of like a record: the record (platter) spins on a “spindle” and the arm moves to different sections on the record to read or write to it. By changing the polarity of sections of the record information, stored in binary form. Looking past the mechanical differences, long-term memory serves a similar purpose in computers and humans. Computer hard drives are slow in reading and writing, not unlike human memories, for human memory takes longer to access older memory, computer memory (hard drives) can store unlimited amounts of information for years. Human memories are more changeable than hard drive data,
Rodan-222, a radioactive isotope sometimes fund in people’s basements has half-life of then 4 days. The shorter the half-life, the active appearing the atom is. For example, a test tube containing a gram of Rn-222 will cause a Geiger counter to click a raster rate then a gram of U- 238 because more atoms are changing per second. In our lab we will calculate the half-life of Ba-137m. This metastable radioactive isotope has a half-life of less than 5 minutes and is made from the radioactive decay of Cs-137 in a mini-isotope generator.
This evidently shows that the mixture of yeast and sugar releases more carbon dioxide, causing the balloon to expand more and thus have a larger circumference. There are many reasons for why the results turned out the way they did. One scientific explanation for the findings is that, “baker’s yeast or Saccharomyces cerevisiae goes through anaerobic fermentation when there is a lack of oxygen” (Microbiologybytes video library). During this anaerobic fermentation, “sugar is converted to energy without oxygen, leading to the creation of ATP and two by products: ethanol and carbon dioxide” (Andrew, 2007). Thus, when sugar and yeast were mixed together in a test tube with no oxygen, carbon dioxide was released into the balloon, causing its circumference to grow larger.
They were mostly limited to going backward and forward and they were not able to travel very fast or far at all. It wasn't until Portugal became a mighty sea power that the Maritime Revolution and change was able to occur. Portugal, having much contact with the Arabs who occasionally docked in the Portuguese ports, was able to convince them to reveal the technology of their ships which brought about great change to European ship designs. Caravel ships with lateen (triangular) sails were traded for the huge carrack ships. Caravel ships were much smaller, much lighter, and very faster than their counterparts.
Inside the hall were engines and generators representing not only the best and newest engineering of America but also of England, Germany, and France (Buers 14). The Palace of Machinery held the power plant that created the 56,000 horsepower needed to sustain the amount of energy used for the Fair. It generated electricity for the lights; as well as ran the massive pumps that fed water to the grounds lagoons and picturesque Cascades. At this point in time only two other power plants in the world had a greater horsepower than the engines featured here. The Allis Chalmers vertical and horizontal refrigerating engine was also here, capable of generating 5,000 horsepower, along with the Curtis Steam Turbine from General Electric Company, which could produce 8,000 horsepower (Corbett 3-5).