Help! 1.How much heat is required to convert 250mL of water from 20o
C into steam at 115o C?

2. From the phase diagram for water (Figure 10.31), determine the sate of water at: -20o

C and 40 kPa.

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium

Match the term to its description match term definition chemical energy a) internal energy caused by vibrations of atoms and molecules electrical energy b) electromagnetic energy that travels in waves radiant energy c) the movement of an electrical charge thermal energy d) potential energy stored in the bonds between atoms

If c + di is a point on the circle, then | c + di |=