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Opening Assignment

Opening Assignment. Take the handout on the lab table Fill in the blanks using the word bank which is on the back of the paper. Heating curve for water - Label the melting Point, boiling point, condensation point, freezing point.

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Opening Assignment

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  1. Opening Assignment • Take the handout on the lab table • Fill in the blanks using the word bank which is on the back of the paper.

  2. Heating curve for water -Label the melting Point, boiling point, condensation point, freezing point • Notice that the temperature does NOT change during a PHASE CHANGE…all of the heat energy that is being added is being used to weaken the bonds between the atoms …

  3. Melting and Boiling Points • Pure substances have different melting points, boiling points and densities! • Review – what is a pure substance?? • Elements and compounds

  4. Melting and boiling points of different substances • You can use the melting point, boiling point and density to identify a pure substance…. • For example: • If a substance has a ………….. • Melting Point of 0 degrees Celsius, • a Boiling Point of 100 degrees Celsius • and a density of 1 g/cm3…then we know this substance is the compound .. • water.

  5. The table below shows you the melting point, boiling point of different pure substances

  6. Aluminum has a melting point of 660 degrees C… • Suppose you had a much bigger piece – three times as large. What would be the melting point?

  7. In your group…how would the heating curve of aluminum change Small piece Large Piece (3 time as large)

  8. Opening AssignmentTake handout on table copy this MCAS question on the back and answer • If 1000 grams of the compound toluene melts at a temperature of -95 °C then 500 grams will • A. melt at −47.5°C. • B. melt at −95°C. • C. boil at 95°C. • D. boil at 47.5°C.

  9. How can I determine the state of a substance at room temperature? • 1. Find the melting and boiling points of the substance • 2. Draw a number line. • 3. Put the melting, boiling point and room temperature on the line…. (room temperature is 20 degrees C) • 4. Use the number line to help you determine if the substance is a solid, liquid or gas at room temperature

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