Which phase change represents a decrease in entropy? (1) solid to liquid (3) liquid to gas (2) gas to liquid (4) solid to gas

3. How much of the Earth's mass is in the core?

Which of these is a neutral salt? Na2SO4 NaCN KF (NH4) 2SO4

An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be? If the atom instead gains 4 electrons the net charge will be?

3. A certain paint has a density of 0.914 g/mL. You need to cover a wall that is 7.6 meters long and 2.74 meters wide with a layer of paint that is 0.13 mm thick.

What is the mass of 6.3 moles of Sulfur?

Name the two sub-atomic particles in the nucleus of an aluminium atom.

Identify the true statement. Choose one: A. The expansion of ice sheets at the end of the Pleistocene caused glacial rebound in northern Canada. B. Regions covered by glacial ice are termed periglacial environments. C.

What is the concentration when 0.065 moles of NaNO3 are dissolved in enough water to make 150.0 mL of solution?

What are the reactants and products of cellular respiration and photosynthesis?

Which situation would probably NOT result in the formation of new species? A) The introduction of a predatory fish that only eats the largest native bass in a Georgia lake.