Solve the following examples (1)A solution contains 40g of common salt in 320g of water. Calculate the concentration terms of mass by mass percentage of the solution.

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Which of the following is a physical property flammability heat of combustion solubility and toxicity