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https://www.answers.com/Q/What_is_the_difference_between_upward_and_downward_delivery
some gases are denser than (heavier) air e.g. CO2, HCl, H2S, Cl2. are delivered by downward delivery. while gases which are Less dense than (lighter) air e.g. H2,NH3 are delivered by upward delivery. simultaneously the downward delivery of gas = upward displacement of air while upward delivery of gas = downward displacement of air.
http://www.gcsescience.com/idownwarddel.htm
A gas that is more dense than air can be collected by downward delivery. Examples of gases that can be collected by this method are carbon dioxide, chlorine, hydrogen chloride and sulfur dioxide. A gas jar is connected by a tube to the flask that is giving off...
http://www.gcsescience.com/iupwarddel.htm
A gas that is less dense than air can be collected by upward delivery. Examples of gases that can be collected by this method are ammonia and hydrogen. A gas jar is connected by a tube to the flask that is giving off the gas as shown in the picture below. The gas...
https://www.answers.com/Q/What_does_the_choice_of_upward_and_downward_delivery_depend_on
CO2, HCl, H2S, Cl2. are delivered by downward delivery. while gases which are Less dense than (lighter) air e.g. H2,NH3 are delivered by upward delivery. simultaneously the downward delivery of gas = upward displacement of air while upward delivery of gas = downward displacement of air.
https://myschool.ng/questions/view/academic-questions/76617
gases lighter than air( e.g ammonia ) are usually collected through upward delivery and downward displacement of air. while those heavier than air (e.g chlorine) is collected through downward delivery and upward displacement of air.
https://www.answers.com/Q/What_is_upward_displacement_of_air
Jun 26, 2012 · CO2, HCl, H2S, Cl2. are delivered by downward delivery. while gases which are Less dense than (lighter) air e.g. H2,NH3 are delivered by upward delivery. simultaneously the downward delivery of gas = upward displacement of air while upward delivery of gas = downward displacement of air.
https://www.answers.com/Q/Why_hydrogen_gas_collected_by_upward_delivery
May 17, 2009 · CO2, HCl, H2S, Cl2. are delivered by downward delivery. while gases which are Less dense than (lighter) air e.g. H2,NH3 are delivered by upward delivery. simultaneously the downward delivery of gas = upward displacement of air while upward delivery of gas = downward displacement of air.
https://www.answers.com/Q/Why_is_ammonia_collected_by_upward_delivery_and_not_over_water
· If a gas is less dense than air it can be collected by upward delivery. · If a gas is denser than air it can be collected using downward delivery.
http://saburchill.com/chemistry/chapters/chap047.html
Collection by downward delivery. This method is used for gases which are soluble in water but more dense than air . Collection over water. It is the best method of collecting a gas so long as the gas is insoluble or slightly soluble in water. This method can be used for insoluble gases which are more dense or less dense than air.
https://www.youtube.com/watch?v=Ol-2JN01Cfo
Jan 27, 2014 · You can collect the gases that you have prepared with this method. Gases that can be collected by this method include : carbon dioxide, oxygen and hydrogen gas. The gases should not be soluble in ...Author: stephenstephenlow
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