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 84% HH662HeHe5707HlHl293HgHg87chemical 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 81% neonneon2051methanemethane13883chlorinechlorine624nitrogennitrogen388chemistry 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 28% clockwiseclockwise983anti-clockwiseanti-clockwise1639it depends on the gasit depends on the gas1181there is no standardthere is no standard348technology 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 50% ozoneozone4177methanemethane5915benzenebenzene947ammoniaammonia612technology 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 63% nitrogennitrogen3262carbon dioxidecarbon dioxide25395water vaporwater vapor1423airair9844cheese riddles » Play chemistry quiz and see all the questions.