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Referring to the figure below: What point in the graph is the phase change of melting occurring?  

Which of the following statements is FALSE about energy changes?

Identify the following as an element, compound, homogeneous mixture, or heterogeneous mixture: plaster= calcium sulfate (CaSO4)

Referring to the figure below: What is the boiling point of the unknown substance?

Determine whether the following statement is TRUE OR FALSE: Particles in the solid state do not have any motion at room temperature.

Identify the following as a metal, nonmetal or semimetal/metalloid: lithium (Li)

Referring to the figure below: At what point(s) on the graph, is the kinetic energy changing?

Identify the following as a physical property, a chemical property, a physical change, or chemical change: Magnesium gave off light when it was burned in oxygen.

Identify the following as a physical property, a chemical property, a physical change, or chemical change: Ammonium dichromate is an orange, crystal.

Two samples of matter have been collected and the elemental composition was determined. Both samples were determined to contain carbon and oxygen. Evaluate the data collected for the two samples of matter shown below: Sample A                           Sample B 24.0 g C: 32.0 g O                             3.0 g C: 4.0 g O Are these two samples the same compound or are they different compounds? Explain your answer and support your answer with a Law.  Write in complete sentences for full credit. (4 points)