Page 22 - Surviving Chemistry BFF Homework Helper and Test Prep Preview

Questions for Regents Practice Matter, Energy & Changes

Parts B-2 and C Constructed Response

Base your answers to questions 19 to 22 on the diagram of a molecule of nitrogen shown below.

represents one molecule of nitrogen.

19. Draw a particle model that shows at least six molecules of nitrogen gas.

20. Draw a particle model that shows at least six molecules of liquid nitrogen.

21. Describe, in terms of particle arrangement, the difference between nitrogen gas

and liquid nitrogen.

22. Good models should reflect the true nature of the concept being represented.
What is the limitation of two-dimensional models?

o
A substance is a solid at 15 C. A student heated a sample of the substance and

recorded the temperature at one-minute intervals in the data table below.

o
23. On the grid, mark an appropriate scale on the axis labeled “Temperature ( C).”
An appropriate scale is one that allows a trend to be seen.

24. Plot the data from the data table.

Circle and connect the points.

25. Based on the data table, what is the
melting point of the substance?

26. What is the evidence that the average
kinetic energy of the particles of the

substance is increasing during the first
three minutes?

27. The heat of fusion for this substance is
122 joules per gram. How many joules of
heat are needed to melt 7.50 grams of this

substance at its melting point ?

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