ChemTutor
Chemistry Tutor for A-Level
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ChemTutor
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ChemTutor
🚫Sodium
🪨chemical element
🪨one of the alkali metals
🪨chemical symbol Na
🪨atomic number 11
🪨very soft
🪨silvery white metal
🪨The sixth most abundant element on Earth
🪨It occurs mainly as halite
🪨Extremely reactive
🚫Chlorine
🪨Chlorine is a yellow-green gas at room temperature.
🪨Chlorine has a pungent, irritating odor similar to bleach that is detectable at low concentrations.
🪨The density of chlorine gas is approximately 2.5 times greater than air, which will cause it to initially remain near the ground in areas with little air movement.
🪨Chlorine is not flammable, but may react explosively or form explosive compounds with many common substances
2 years ago | [YT] | 7
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ChemTutor
🎯The noble gases or the inert gases
🎯sometimes referred to asaerogens
🎯 Theyare the naturally occurring members of group 18 of the periodic table 🎯These chemical elements are odorless and colorless
🎯These are gases with very low chemical reactivity
🎯energy shells of noble gases are already full with their maximum number of electrons
🎯No space is there to keep the any more electrons
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ChemTutor
🖋️Mercury is also known as quicksilver
🖋️Mercury is aMetallic chemical element 🖋️chemical symbol is Hg
🖋️atomic number is 80
🖋️ Mercury is the only elemental metal that is liquid at ordinary temperature
🖋️Its freezing point of −38 °F (−39 °C) and a boiling point of 674 °F (356.9 °C).
🖋️Its Silvery white in colour
🖋️Mercury is dense, toxic and a good conductor of electricity
🖋️Mercury is occasionally found free in nature but usually occurs as the red sulfide ore
🖋️ Uses of mercury
🎗️In dental and industrial amalgams
🎗️As a catalyst, in electrical and measuring apparatus and instruments (e.g., thermometers)
🎗️As the cathode in electrolytic cells
🎗️In mercury-vapour lamps
🎗️As a coolant and neutron absorber in nuclear power plants
🎗️Many of mercury’s compounds, in which it has valence 1 or 2, are pigments, pesticides, and medicines
🖋️Mercury is a dangerous pollutant because it concentrates in animal tissues in increasing amounts up the food chain.
2 years ago | [YT] | 8
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