Which of these are true. a) in molecular compounds, more heat is needed to separate their molecules than is needed to separate ions. b) molecular compounds melt at much higher temperatures than do ionic compounds. c) molecular compounds boil at much higher temperatures than do ionic compounds. d) in molecular compounds, most are poor conductors of electricity when dissolved in water

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.