B) use the first law of thermodynamic to calculate au for the following situations: (i) a coiled spring unwinds producing 153 j of work and losing 37 j as heat to friction (1 mark) (ii) an insulated bucket of water is stirred by a paddle, which provides 289 j of work. (1 mark) (iii) adding 1 kj of heat to a sample of gas in an isovolumetric process. (1 mark) (iv) the isothermal compression of a gas from 26 l to 5 l. (1 mark) (v) the isobaric expansion of a gas from 5 l to 18 l at a constant pressure of 950 kpa caused by the addition of 15.6 kj of heat.

the solar system used to have much dust particles option no d

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.