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Answers
(ii) Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation
(iii) A difference in critical temperatures among gases means that some gases are easier to liquefy than are others. The critical temperature of carbon dioxide is high enough so that it can be liquefied relatively easily at or near room temperature
(iv) Wet Clothes do not dry easily on a rainy day because the air has a lot of water vapour on it and it cannot accommodate the water vapour created by the wet clothes so the water remains in the clothes for a longer time. The rate of evaporation depends on the temperature weather and humidity.
(v) The air is so saturated with water that your sweat can't evaporate, leaving you hot and soggy. ... So when you step out of the shower, you enter an environment primed to make the water on your skin evaporate quickly. Add in the fact that warm water evaporates faster
8)
(a) Arc and Ca are called isobars because they are atoms (nuclides) of different chemical elements.
(b) He and Ne have zero valency because they are noble gases and do not react with any other gases
(c) An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. ... The nucleus of an atom contains protons and neutrons. hence it is positively charged.
(d) Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion. If it gains one or more electrons, it now carries a net negative charge, and is thus "anionic.
(e) They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element. The electron arrangement is the same owing to same chemical properties. However they have different numbers of neutrons, which affects the mass number.
9)
(i) the molecules of a solid have strongest intermolecular spaces because the constituent particles are closely packed. That is why; solids are incompressible and have high density.
(ii) a gas can be easily compressed because the molecules of gas have less intermolecular spaces.
(ii) Plasma is the fourth state of matter it comprises of highly charged particles which light when current or heat is passed through them. In stars plasma is formed due to the high temp of it's core
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