What is a similarity of primary and secondary cell​

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Label a-f based on the table using c for concentrated and d for dilute