What is the condensation AND freezing point of water C AND F!!

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

The identities of substances are the same before and after which type of change

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?