What happens when: (4)
a. Magnesium reacts with dilute HCl?
b. Sodium hydrogen carbonate reacts with dilute H2SO4?
c. Copper oxide reacts with dilute sulphuric acid?
d. Sodium reacts with chlorine?
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Answers
Answer:
(1) Magnesium reacts with hydrochloric acid according to the equation: Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g) This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas
(2) You would except since it is an acid base reaction to get H2CO3, carbonic acid, but the formation of a gas is far more thermodynamically favourable, plus you can see bubbles, so that indicates CO2 has formed. Sodium carbonate reacts with sulphuric acid to give sodium sulphate, water and carbon dioxide.( 3) Mixing copper oxide and sulphuric acid is an experiment involving an insoluble metal oxide which is reacted with a dilute acid to form a soluble salt. Copper (II) oxide, is a black solid, which, when reacted with sulphuric acid creates a cyan-blue coloured chemical called copper II sulfate. (4)When a sodium atom transfers an electron to a chlorine atom, forming a sodium cation (Na+) and a chloride anion (Cl-), both ions have complete valence shells, and are energetically more stable. The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.
Answer:
(A) Adding magnesium metal to hydrochloric acid produces hydrogen gas. The magnesium dissolves to form magnesium chloride, MgCl2. Let's write a balanced equation for this reaction.
(b) You would except since it is an acid base reaction to get H2CO3, carbonic acid, but the formation of a gas is far more thermodynamically favourable, plus you can see bubbles, so that indicates CO2 has formed. Sodium carbonate reacts with sulphuric acid to give sodium sulphate, water and carbon dioxide.
(c) Mixing copper oxide and sulphuric acid is an experiment involving an insoluble metal oxide which is reacted with a dilute acid to form a soluble salt. Copper (II) oxide, is a black solid, which, when reacted with sulphuric acid creates a cyan-blue coloured chemical called copper II sulfate.
(d) When a sodium atom transfers an electron to a chlorine atom, forming a sodium cation (Na+) and a chloride anion (Cl-), both ions have complete valence shells, and are energetically more stable. The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.
Explanation:
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