State whether the following properties are extensive or intensive. 1. Density, 2. Potential energy. 3. Pressure. 4. Specific heat

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.