Inaninsulatedcalorimeter,100.0gof1. 00MHN03ismixedwith100.0gof1.00MKOH. The temp went from 22.1° C to 28.6° C. Calculate the heat of reaction. C for water is 4.184 J/g °C and C for the calorimeter is 18.80 J/ °C a) -27.8 kJ/mol b) -55.6 kJ/mol c) 55.6 kJ/mol d) 54.4 kJ/mol

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

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