Chemistry Test - 4

As Cd²⁺ and Cu²⁺, both are dipositive ions but Cu²⁺ has one half of the concentration compared to that of the Cd²⁺. Thus, the molar amount of the H₂S used to precipitate the metals ions Cd²⁺ and Cu²⁺ is 2 : 1.

All of the options mentioned can act as sources of energy in living systems, but they serve different roles and are broken down differently within the body. Here's an explanation for each:

1. Fat: Fats are a major source of energy for the body, providing 9 calories per gram. They are stored in adipose tissue and can be broken down through a process called beta-oxidation to produce energy in the form of ATP when the body needs it.

2. Glucose: Glucose is a simple sugar and the primary source of energy for cells. It is the main product of carbohydrate digestion and is transported through the bloodstream to cells, where it is broken down via glycolysis and cellular respiration to produce ATP, the main energy currency for cells.

3. Fructose: Fructose is another simple sugar found in fruits, honey, and some vegetables. It can be converted into glucose in the liver and then used as a source of energy through the same pathways as glucose.