which is the correct balanced equation for the following reaction liquid silicon tetrachloride reacts with liquid water to produce solid silicon dioxide and hydrochloric acid
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which is the correct balanced equation for the following reaction
liquid silicon tetrachloride reacts with liquid water to produce solid silicon dioxide and hydrochloric acid
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- Name and give symbols for three transition metals in the fourth period. Look up each of your choices in a dictionary, a book such as The Handbook of Chemistry and Physics, or on the Internet, and make a list of their properties. Also list the uses of each element.3.107 As computer processor speeds increase, it is necessary for engineers to increase the number of circuit elements packed into a given area. Individual circuit elements are often connected using very small copper “wires” deposited directly onto the surface of the chip. In some processors, these copper interconnects are about 22 nm wide. How many copper atoms would be in a 1-mm length of such an interconnect, assuming a square cross section? (The density of copper is 8.96 g/cm3.)A materials engineer has filed for a patent for a new alloy to be used in golf club heads. The composition by mass ranges from 25 to 31% manganese, 6.3 to 7.8% aluminum, 0.65 to 0.85% carbon, and 5.5 to 9.0% chromium, with the remainder being iron. What are the maximum and minimum percentages of iron possible in this alloy? Use Figure 2.12 to snake a prediction about how the density of this alloy would compare with that of iron; justify your prediction.
- Two general chemistry students working together in the lab weigh out 0.832 g of CaCl2 2 H2O into a crucible. After heating the sample for a short time and allowing the crucible to cool, the students determine that the sample has a mass of 0.739 g. They then do a quick calculation. On the basis of this calculation, what should they do next? (a) Congratulate themselves on a job well done. (b) Assume the bottle of CaCl2 2 H2O was mislabeled; it actually contained something different. (c) Heat the crucible again, and then reweigh it.There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.All of the platinum ever mined = 25 ft3 What is the price of all of the paltinum ever mined? (1ft=30.48 cm, Density of platinum=21.45 g/cm3, Price of platinum= $29.93 per gram)
- Cocaine (C17H21O4N; Figure 2) is a natural substance found in leaves of the coca plant, which have been used for centuries as a local anaesthetic and stimulant. Illegal cocaine arrives in the USA either as the pure compound or as the hydrochloride salt (C17H21O4NHCl). At 25oC, the salt is very soluble in water (2.50 kg/L), but pure cocaine is much less so (1.70 g/L). What is the maximum amount of the salt (in gram) that can dissolve in 50.0 mL of water? When a 25 mL aqueous solution that contains 62.50 g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water (in litres) is needed additionally to dissolve the formed pure cocaine? Round your final answer off to two decimal points.1.) Calculate the molar mass of the given compounds. A) P 2 O 5 B) Al (ClO 3 ) 3 C) NaNO 3 2.) The height of horse is usually measured in hands a with a mass of 525 kg. One hand is exactly 1/3 ft. What is the mass of the horse in mg ? how tall in m is a horse of 17.8 hands?Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown substances they find in the course of their duties. One such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder. Elemental analysis of the compound reveals that it is 67.31 % carbon, 6.978% hydrogen, 4.617% nitrogen, and 21.10% oxygen by mass. Which of the compounds could the powder be? C17H19NO3C17H19NO3 = morphine, analgesic C17H21NO4C17H21NO4 = cocaine, illicit drug C7H5N3O6C7H5N3O6 = 2,4,6-trinitrotoluene (TNT), commonly used explosive C10H15NC10H15N = methamphetamine, stimulant C4H5N2OC4H5N2O = caffeine, stimulant C11H15NO2C11H15NO2 = 3,4-methylenedioxymethamphetamine (MDMA), illicit drug C21H23NO5C21H23NO5 = heroin, illicit drug C3H6NO3C3H6NO3 = hexamethylene triperoxide diamine (HMTD), commonly used explosive
- You can calculate cost effectiveness using the following formula: volume of HCI neutralized per dose / cost per dose If you calculated that your volume of HCl neutralized per dose was 23.73 mL, calculate the cost effectiveness for TUMS. You can directly use the cost per dose you calculated in the previous problem. Do not include a unit in your answer. Report your answer to two decimal places. TUMS antacid: 2 tablets / 500 mg dose 50 tablets / container Cost: $4.98 / containerA student performed the identical experiment to isolate Fe, NaCl, and SiO2 in a mixture. They performed every step correctly except they extracted with 10 mL of deionized water only once rather than the recommended four times. a.) Will this error make the calculated mass percent of Fe, NaCl, and SiO2 accurate or inaccurate. Explain your answer. b.) Will the calculated mass percents of Fe, NaCl, and SiO2 be higher or lower than the true values? - Mass percent of Fe (HIGHER or LOWER) Must explain answer. - Mass percent of NaCl (HIGHER or LOWER) Must explain answer. - Mass percent of SiO2 (HIGHER or LOWER) Must explain answer.We experimented on various elements: Mossy Zinc, Aluminum Turnings, Copper Turnings, Activated Carbon, and Iron Fillings. We identified the physical properties based on Color, Luster, Form, and Conductivity and the chemical properties based on reaction to HCl and CuCl2. We were tasked to identify if the given elements were metals or nonmetals. The result of our observation is shown in the image. Based on this, what elements are metals and nonmetals? Iron is known to be a metal however, the iron fillings did not conduct electricity and do not have a metallic luster. Does that mean they are not metal? Is it right to say "corroded" in the CuCl2, when the sample formed rust-like material on its surface?