If you double the lenght of a wire, how does the resistance of the wire change? and

If you make a wire twice as thick, how does the resistance of the wire change?

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.