Chemical Reactions and Equations 19
(c) Hydrogen(g) + Chlorine(g) → Hydrogen
chloride(g)
(d) Magnesium(s) + Hydrochloric acid(aq) →
Magnesium chloride(aq) + Hydrogen(g)
9. What does one mean by exothermic and
endothermic reactions? Give examples.
10. Why respiration is considered an exothermic
reaction? Explain.
11. Why decomposition reactions are called the
opposite of combination reactions? Write
equations for these reactions.
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magnesium + hydrochloric acid gives magnesium chloride + chlorine
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