*1. (a)* *(i) Three ways of conserving energy in the home:* 1. Switching off lights and appliances when not in use 2. Using energy-efficient appliances (e.g., LED bulbs) 3. Using natural light and ventilation *(ii) Calculate the energy used:* Energy = Power × Time = 4000 W × 12 h = 4000 × 3600 × 12 (convert hours to seconds) = 4000 × 43200 = *172,800,000 J* or *172.8 MJ* --- *2. (b)* *(i) Two examples of acid-base indicators:* 1. Litmus 2. Methyl orange *(ii) Colour change in orange juice (acidic):* - Litmus: Blue → Red - Methyl orange: Orange → Red --- *3. (c)* *(i) Four activities to ensure a green economy in Ghana:* 1. Recycling and waste management 2. Promoting renewable energy use 3. Practicing sustainable farming 4. Environmental education and awareness *(ii) Two primary greenhouse gases:* 1. Carbon dioxide (CO₂) 2. Methane (CH₄)