Question

Classify each of these reactions. Ba(CIO), BaCl, +302 NaNO, + HCl-NaCl + HNO, exchange (double replacement) combination (synthesis) displacement (single replacement) decomposition combination (synthesis) exchange (double replacement) decomposition displacement (single replacement) CaO + CO2 Caco, ZnSO4 + Mg Zn + MgSO. exchange (double replacement) combination (synthesis) displacement (single replacement) decomposition decomposition combination (synthesis) displacement (single replacement) exchange (double replacement)

Answer 1

(1) (a) Decomposition reaction: It is type of reaction in which a single compound breaks into two or more individual elements. Ba(C103) - BaCl, + 30% Therefore, the correct option is Decomposition (b) Combination reaction It is type of reaction in which two or more elements or compounds combine to form a single compound. CaO+ CO → CaCO, Therefore, the correct option is Combination (c) Double replacement reaction: It is type of reaction between two compounds in which the cations and anions of the reactants switch places. NaNO, + HC — NaCl + HNO, Therefore, the correct option is Exchange (d) Single replacement reaction: It is type of reaction between an element and compound in which the compound takes an other element. ZnSO. + Mg -→ Zn + MgSO4 Therefore, the correct option is Displacem ent (2) Empirical formula = CH, molar mass of empirical formula = molar mass of C+2(molar mass of H) = 12 g/mol +2(1 g/mol) = 14 g/mol molar mass of the compound= 42 g/mol molar mass of the compound molar mass of empirical formula 42 g/mol n= 14 g/mol n = 3 Calculate the molecular formula of the compound as follows: molecular formula = (Empirical formula) molecular formula = (CH) molecular formula = CH. Therefore, the required solution is C3H6

(3) Given, mass of argon = 25.8 g molar mass of argon = 40.0 g/ mol Calculate the moles of argon as follows: mass of argon moles of argon molar mass of argon 25.8 g moles of argon 40.0 g/mol moles of argon = 0.645 mol Therefore, the required solution is 0.645 mol (4) Diatomic elements are the molecules which are formed by bonding two atoms of the same element together. There are 7 diatomic elements and are as follows: Hydrogen-H, Nitrogen-N, oxygen- Chlorine-Cl, Bromine-Br2 Fluorine-F, Iodine-12 Therefore, the correct options are N, Br), a and H.