Gold has always been a highly prized metal, widely used from the beginning of history as a store of value. it doesn\'t rust like iron and doesn\'t become tarnished like silver. it is so chemically inert that it won\'t react even with the strongest concentrated acids. but it can be dissolved in aqua regia – a fresh-prepared mixture of concentrated hno3 and hcl (1: 3). when germany invaded denmark in world war ii, the hungarian chemist george de hevesy dissolved the gold nobel prizes of max von laue and james franck in aqua regia to prevent the nazis from stealing them. he placed the jar with the solution on a shelf in his laboratory, and after the war, precipitated the gold out of the acid and returned it to the royal swedish academy of sciences and the nobel foundation who recast the medals and again presented them to laue and franck. the unbalanced equation for the reaction of gold with aqua regia is given below. add the stoichiometric coefficients to the equation to balance it. au(s)+hno3(aq)+hcl(> haucl4(aq)+no2(g)+h20(l)what's the function of hcl?
Answers: 1
Chemistry, 21.06.2019 15:50
The density of glycerin is 1.26grams/centimeter cubed . how many is this? use the conversion rates of and . express your answer to the correct number of significant figures.
Answers: 1
Chemistry, 22.06.2019 08:40
For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate
Answers: 3
Chemistry, 22.06.2019 19:30
Helium decays to form lithium. which equation correctly describes this decay?
Answers: 2
Chemistry, 23.06.2019 06:00
Nthis lab, you will do experiments to identify types of changes. using the question format you learned (shown above), write an investigative question that you can answer by doing these experiments
Answers: 3
Gold has always been a highly prized metal, widely used from the beginning of history as a store of...
History, 04.08.2019 13:00
Social Studies, 04.08.2019 13:00
Social Studies, 04.08.2019 13:00
History, 04.08.2019 13:00
Biology, 04.08.2019 13:00
Biology, 04.08.2019 13:00
Chemistry, 04.08.2019 13:00
Social Studies, 04.08.2019 13:00
English, 04.08.2019 13:00
History, 04.08.2019 13:00
Computers and Technology, 04.08.2019 13:00
History, 04.08.2019 13:00
Chemistry, 04.08.2019 13:00
History, 04.08.2019 13:00
Business, 04.08.2019 13:00
Biology, 04.08.2019 13:00
History, 04.08.2019 13:00