An electric current can be measured with a device called?

Identify two types of chemical bonding in the source of dietary potassium

How do dying stars contribute to the formation of planets

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.