Chemistry
Classify the following reactions as combination, decomposition, displacement, precipitation and neutralization. Also balance the equations. (a) CaCO<sub>3</sub> (s) CaO (s) + CO<sub>2</sub> (g) (b) Zn(s) + H<sub>2</sub>SO<sub>4</sub> ZnSO<sub>4</sub> (s) + H<sub>2</sub> (g) (c) AgNO<sub>3</sub> (aq) + NaCl (aq) AgCl(s) + NaNO<sub>3</sub> (d) NH<sub>3</sub> (g) + HCl (g) NH<sub>4</sub>Cl (s) (e) CuSO<sub>4</sub> (aq) + H<sub>2</sub>S (g) CuS (s) + H<sub>2</sub>SO<sub>4</sub> (l) (f) Zn (s) + CuSO<sub>4</sub> (aq) ZnSO<sub>4</sub> (aq) + Cu(s) (g) Ca(s) + O<sub>2</sub> (g) CaO(s) (h) NaOH + HCl NaCl + H<sub>2</sub>O (i) KOH + H<sub>2</sub>SO<sub>4</sub> K<sub>2</sub>SO<sub>4</sub> + H<sub>2</sub>O
Answer
(a) Decomposition reaction
(b) Displacement reaction
(c) Precipitation reaction
(d) Combination reaction
(e) Precipitation reaction
(f) Displacement reaction
(g) Combination reaction
Balanced Equation:
2Ca(s) + O2 (g) ⟶ 2CaO(s)
(h) Neutralization reaction
(i) Neutralization reaction
Balanced Equation:
2KOH + H2SO4 ⟶ K2SO4 + 2H2O
Related Questions
Fill in the blanks:
(a) A reaction in which two or more substances combine to form a single substance is called a …………… reaction.
(b) A …………… is a substance which changes the rate of a chemical reaction without undergoing a chemical change itself.
(c) The formation of gas bubbles in a liquid during a reaction is called …………… .
(d) The reaction between an acid and a base is called …………… .
(e) Soluble bases are called …………… .
(f) The chemical change involving iron and hydrochloric acid illustrates a …………… reaction.
(g) In the type of reaction called …………… two compounds exchange their positive an negative radicals respectively.
(h) A catalyst either …………… or …………… the rate of a chemical change but itself remains …………… at the end of the reaction.
(i) The chemical reaction between hydrogen and chlorine is a …………… reaction.
(j) When a piece of copper is added to silver nitrate solution, it turns …………… in colour.
Define:
(a) Precipitation
(b) Neutralization
(c) Catalyst
Explain the following types of chemical reactions giving two examples for each of them:
(a) combination reaction
(b) decomposition reaction
(c) displacement reaction
(d) double displacement reaction