Why is measuring heat so important

Which property describes a mixture? Select three options.

A gas with constant temperature has a pressure of 4 atm. This pressure changes to 0.2 atm, causing the volume to increase to 500 L. Based on the relationship between pressure and volume, what must have happened to the pressure?

What is its molar heat of vaporization in kilojoules per mole if its vapor pressure at 20°C is 11.0 torr?

Which choice represents a pair of resonance structures? note that lone pairs have been omitted for clarity. hints which choice represents a pair of resonance structures? note that lone pairs have been omitted for clarity.

Each period of the periodic table ends with:

Chemistry Lab Question: Filtration Compare the size the particles of refined sand with the size of particles of the dissolved salt in the mixture? Compare the size of the pores in the filter paper, to the sizes of the sand and salt particles?

What is the [oh-] in a sample of lime juice with a ph of 2.0?

What is the subscript present in NaCl?

Identify each element as a metal, metalloid, or nonmetal. a. gold b. silicon c. manganese d. sulfur e. barium

Extreme (1, 2, or 3) in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The (4, 5, or 6) of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei. 1. expansion 2. heat 3.