Prepare written answers to the following exercises:
1. Write the electronic configurations for the following elements:
2. Write the Lewis structures for the following compounds:
- CH3COOH (carbons are bonded to one another)
- Dichloromethane (CH2Cl2)
- Hydrogen peroxide (H2O2)
- Hydrogen cyanide (HCN)
3. Methane (CH4) behaves as an ideal gas under standard temperature and pressure conditions. What volume is occupied by 1 kg of methane at a temperature of 35 °C and a pressure of 0.9 atm?
4. How much energy is released when an ice cube tray containing 250 ml of water freezes? The heat of fusion for water is 6.02 kJ/mol.