Chemistry

Chemistry, 19.09.2019 12:20, lineaeriksen

What is the chemical name for caco3?

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Chemistry, 06.10.2019 16:50, skaterwolf1317

For the equation caco3 (s) + 2hcl (aq) → cacl2 (s) + h2 (aq) + h2o (l), 100.00 g of caco3 pellets are combined with 250 ml of hcl of a 2.0 m solution. which of the following will increase the rate of the chemical reaction? a. add heat to the reaction. b. increase the concentration of hcl to 3.0 m. c. crush the caco3 into powder. d. all of the above e. none of the above

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Biology, 07.10.2019 11:30, Damagingawsomeness2

Which option shows a reaction in which calcium carbonate (caco3) produces calcium oxide and carbon dioxide? synthesis: cao + co2 → caco3 double displacement: cao → co2 + caco3 decomposition: caco3 → cao + co2 single displacement: caco3 → cao + co2

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Geography, 10.10.2019 20:00, laykaleb086

C). nitrate ion in the digestive tract d) potassium ion in the digestive tract. 35. normally a water considered soft that contains a). 0-60 mg/l of caco3 equivalent b). 61-12 mg/l of caco3 equivalent c). 121-180 mg/l of caco3 equivalent d). > 180 mg/l of caco3 equivalent e). none of the above 36. unpolluted fresh waters usually have a ph between a). 4,0-9.0 b). 2.0-4.0 c). 7.0-10.0 d). 10-14 e). none of the above 37. the phosphorus level in domestic water supply should be a). 1 mg/l b). below 1 mg/l c). above 2 mg/l d). below 2 mg/l e). none of the above 38. which of the following is an intestinal protozoan? a). rhizobium b). nitrosomonas c). cryptosporidium d). diatom e). none of the above 39. the maximum contamination levels (mcls) for public drinking water supplies in the u.s. for chemical such as carbon tetrachloride is a), 0.5 ㎍/1. c). 15ug/1, d). 2.0 pg/l, e). none of the above

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