What is the formula for the ionic compound formed between calcium and sulfur?

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

Write the overall equation for the reaction occurring in lithium battery?