Identifying gases 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Further Resources This task is about using a key to identify gases. Question 1Change answer Use the key to identify the gases in the jars labelled A to D. Key to identifying gases 1. Is the gas colourless? Yes No go to 2 ⇒nitrogen dioxide 2. Is the gas soluble in water? Yes No go to 3 go to 4 3. Does the gas turn moist litmus pink? Yes No ⇒carbon dioxide ⇒ammonia 4. Is the gas less dense than air? Yes No ⇒hydrogen ⇒oxygen Use the key to identify the gases in the jars labelled A to D. Key to identifying gases 1. Is the gas colourless? Yes No go to 2 ⇒nitrogen dioxide 2. Is the gas soluble in water? Yes No go to 3 go to 4 3. Does the gas turn moist litmus pink? Yes No ⇒carbon dioxide ⇒ammonia 4. Is the gas less dense than air? Yes No ⇒hydrogen ⇒oxygen Jar A Jar B Jar C Jar D Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygenNitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygenNitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygenNitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygenNitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen Task administration: This task can be completed with pencil and paper or online (with auto-marking displayed to students). Level: 5 Curriculum info: Science, Communicating in science, Material World Keywords: properties, gas, classification keys Description of task: Students are given some information about four gases. They use this information and a key to identify the four gases. Curriculum Links: Science capabilities The capabilities focus is brought about by the conversations you have and the questions you ask. Capability: Interpret representations This resource provides opportunities to discuss the purposes of identification keys and how to read them. Science capability: Interpret representations (TKI) Science capabilities: Interpret representations Answers/responses: Y10 (05/1999) Jar A Hydrogen Jar B Nitrogen dioxide Jar C Carbon dioxide Jar D Ammonia easy easy easy easy Key to micro-organisms Classifying plants
