Descriptive Chemistry

1.Write equations for the neutralization reactions that result in the formation of the following salts: a) lithium carbonate b) copper (II) chlorate c) aluminum sulphate d) ammonium iodide 2.For each of the following situations, identify those for which a reaction is likely to occur. For those that do occur, write a net ...continues

The Atom: Quantization of energy

What experimental evidence requires that the emission of energy by an atom be quantized?

Periodicity and Chemical Bonding

1. How does ionization energy change as one proceeds a)across the periodic table in a horizontal row b)down the periodic table in a vertical group Give an explanation for each answer. 2. Arrange the following atoms or ions in order of increasing radius: Cl, S2-, K, K+, O Give an explanation for the position of ...continues

Chemical Bonding

1. Consider you would expect a BeF2 molecule to be linear but an SF2 molecule to be angular. 2. a) How would you designate the hybrid orbitals formed by “mixing” one d one s and two p orbitals? b) How many of the hybrid orbitals would be formed by the mixing? 3. Explain why C20H40 is a solid at 25oC, while C4H8 is a gas ...continues

Chemical Bonding

1. Consider the following data: expect a BeF2 molecule to be linear but an SF2 molecule to be angular. Solubility in Water Melting (kg/kg H2O, 25oC) Point (oC) NaF 0.042 988 NaCl 0.357 801 NaBr 1.16 755 Nai 1.84 651 a) Explain the decreasing melting point from NaF to Nai. b) Explain th ...continues

Energy in chemical reactions

1. Calculate the heat of combustion for C2H6 from the following information: C2H4 + 3O2 → 2CO2 + 2H2O ▲Hof – 1409.5 kJ C2H4 + H2 → C2H2 ▲Hof – 136.7 kJ H2 + 1O2 → H2O ▲Hof – 285.5 kJ 2

Rates of Reactions

1. Explain why the rate of a simple chemical reaction such as: NO(g) + 1O2(g) → NO2(g) is likely to be most rapid at the beginning of the reaction. 2. If you wish to dissolve a lump of sugar in water, give three ways you could increase the rate at which the sugar dissolves? Explain why each procedure is effective. ...continues

Chemical Equilibrium

1. Define dynamic equilibrium state in terms of a) reaction rates b) change in observable properties c) energy and entropy state 2. In which of these closed containers is the vapour pressure the greatest? Explain the choice. a) a 1 L container with 5 mL of water held at 20˚C b) a 1 L container with 15 mL of water ...continues

Chemical Equilibrium

1. Consider the following reaction: N2(g) + 2O(g) →← 2NO2(g) (one arrow is supposed to be on top of the other arrow) At a certain temperature, the following are the equilibrium concentrations for the above reaction: (N2) = 8.0 mol/L (O2) = 2.0 mol/L (NO2) = 4.0 mol/L Determine the equilibrium ...continues

Chemical Equilibrium

1. Consider the equilibrium reaction: A(g) →← 2B(g) + C(g) (one arrow is supposed to be on top of the other arrow) When 1.00 mol of A is placed in a 4.00 L container at temperature t, the concentration of C at equilibrium is 0.0540 mol/L. What is the equilibrium constant for the reaction at temperatur ...continues