Gases questions This is a list of recently added questions about gases. What is the chemical symbol of helium?He. H is the chemical symbol of hydrogen. Hg is the chemical symbol of Mercury.Created by: globalquiz.orgvery easy 83% HH396HeHe3368HlHl201HgHg59chemical elements riddles » Which of the following is not a chemical element?Methane. Neon, chlorine and nitrogen are chemical elements. Methane is a chemical compound, the simplest alkane and the main component of natural gas.Created by: globalquiz.orgvery easy 83% neonneon832methanemethane6686chlorinechlorine307nitrogennitrogen185chemistry riddles » Are gas fittings tightened clockwise or anti-clockwise?It depends on the gas. Some gas fittings use reverse threads to prevent disastrous misconnections. For example, oxygen fittings are right-handed, but acetylene and other flammable gases use left-handed fittings.Created by: globalquiz.orgvery hard 30% clockwiseclockwise739anti-clockwiseanti-clockwise1317it depends on the gasit depends on the gas1018there is no standardthere is no standard270technology riddles » Which gas is colorless and odorless?Methane is the main component of natural gas piped into homes for domestic heating and cooking purposes. In order to assist in detecting leaks, a sulphur-like odorant is added the gas used by consumers.Created by: Kasiahard 51% ozoneozone3301methanemethane4895benzenebenzene753ammoniaammonia466technology riddles » What is inside Swiss cheese holes?Carbon dioxide is produced by bacteria feeding on the lactic acid. In the Middle Ages, the holes were considered a sign of imperfection and cheese makers would try to avoid them.Created by: Kasiaaverage 64% nitrogennitrogen2297carbon dioxidecarbon dioxide18240water vaporwater vapor1018airair6741hard simple questions riddles » Play chemistry quiz and see all the questions.