Answer:
(d) All spontaneous reactions have a negative free-energy change
Explanation:
All spontaneous reactions releases free energy which can be used later for the work to be done. A reaction with a negative value for ΔG releases free energy and is thus spontaneous
2) is the answer. graphite and diamonds possess the same molecular structes however the bonds and structures of diamonds are considerably stronger and more tightly packed respectively
CaCO₃ partially dissociates in water as Ca²⁺ and CO₃²⁻. The balanced equation is,
CaCO₃(s) ⇄ Ca²⁺(aq) + CO₃²⁻(aq)
Initial Y - -
Change -X +X +X
Equilibrium Y-X X X
Ksp for the CaCO₃(s) is 3.36 x 10⁻⁹ M²
Ksp = [Ca²⁺(aq)][CO₃²⁻(aq)]
3.36 x 10⁻⁹ M² = X * X
3.36 x 10⁻⁹ M² = X²
X = 5.79 x 10⁻⁵ M
Hence the solubility of CaCO₃(s) = 5.79 x 10⁻⁵ M
= 5.79 x 10⁻⁵ mol/L
Molar mass of CaCO₃ = 100 g mol⁻¹
Hence the solubility of CaCO₃ = 5.79 x 10⁻⁵ mol/L x 100 g mol⁻¹
= 5.79 x 10⁻³ g/L
In context|organic compound|lang=en terms the difference between propane and hexane is that propane<span> is (organic compound) an aliphatic hydrocarbon, c3h8, a constituent of natural gas while </span>hexane<span> is (organic compound) any of five isomeric aliphatic hydrocarbons, c6h14 they are colorless, volatile liquids. As nouns the difference between </span>propane<span> and </span>hexane<span> is that </span>propane<span> is (organic compound) an aliphatic hydrocarbon, c3h8, a constituent of natural gas while </span>hexane<span> is (organic compound) any of five isomeric aliphatic hydrocarbons, c6h14 they are colorless, volatile liquids.
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Answer:
B. it is a community of plants,animals and there physical surrounding.
