Determining the final temperature of the water-iron mixture
2K+2H_2 O →2KOH+ H_2
A 5.00 g chunk of potassium is dropped into 1.00 kg water at 24 deg C. What is the final temperature of the water after the preceding reaction occurs? Assume that all the heat is used to raise the temperature of the water
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The vessel contains 2.00 moles of hydrogen, 2.00 moles of argon, and 5.00 moles of methane. What is the partial pressure of hydrogen?
A 250-kg crate B is suspended from a cable attached to a 20-kg trolley A which rides on an inclined I-beam as shown. Knowing that at the instant shown the trolley has an acceleration of up to the right.
0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO3 and 0.50 M Ba(NO3)2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 10-12 and respectively.
The volume of a manifold used to transfer gases is calibrated using Boyle's Law. A 0.251-dm3 flask at pressure of 697 Torr is attached and after system pumpdown, the manifold is at 10.4 mTorr. The stopcock between the manifold and the flask is the
Determine the molar ratio of NaBH4 to benzophenone that you ACTUALLY used in the experiment. why do you think that it was necessary to use a greater molar ratio than the equations at the beginning indicate?
Sand and iron particales that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles
A sample of MgCl2 is known to be contaminated with NaCl. A 3.47-g portion of the sample is dissolved in water and treated with an excess of AgNO3 solution. The precipitate is filtered off, dried and weighed. The dried precipitate weighs 10.3 g. Ca
What are the industrial uses of iodine tetrachloride?
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What is the normal function of the ERCC6 protein in the body? How can a mutation in this gene explain the photosensitivity phenotype observed
What do we call these plasmid maintenance systems in prokaryotes? How does the ccdB function in this particular system in E. coli
Question: Burning fossil fuels can create a couple of different compounds that can be harmful to life.
Which best describes the qualities of capillaries, with respect to blood pressure and the capacity for exchanging materials with tissues?
What is the approximate diameter of a capillary? The width of one hemoglobin molecule The width of one Fe2+ atom The width of the aorta
Introduction: In this lab, you will examine the water cycle. Review the water cycle in this week's reading before beginning.
Question: Which of the following is the correct order of blood movement through the heart?