Physical and Chemical Changes Labreport
Physical and Chemical Changes LabReport
PROBLEM: What are the signs of a chemical vs. a physical change?
HYPOTHESIS: If I observe a chemical change, then _____. If I observe a physical change, then _____.
PROCEDURE: You will be conducting 11 experiments in this lab. The directions for each lab are on the desks. You will have 5 minutes to read the directions, perform the experiment, record your data, and reset the station.
DATA ANALYSIS: Conduct each experiment and look for changes. Use the data table below to record your findings. Decide whether each test is showing a physical or chemical change, and state the empirical evidence (dissolving, change of state of matter, production of gas, change of color, change of size, burning, etc.). By stating your reason for your observation, you will have crossed over from apprentice to proficient observations skills. After you have finished the test at each station, clean up the area and get it ready for the next group.
DATA ANALYSIS
STATION / OBSERVATION / PHYS? / CHEM? / EMPIRICAL EVIDENCE1
2
3
4
5
STATION / OBSERVATION / PHYS? / CHEM? / EMPIRICAL EVIDENCE
6
7
8
9
10
11
CONCLUSION:
Describe the different types of evidence you observed for chemical changes and for physical changes.
What conclusion can you draw about the difference between a physical and chemical change?
Was your hypothesis supported? Tell why it was or was not.
Physical and Chemical Changes Lab Report(Answer Key)
PROBLEM: What are the signs of a chemical vs. a physical change?
HYPOTHESIS: If I observe a chemical change, then _____. If I observe a physical change, then _____. (answers will vary)
PROCEDURE: You will be conducting 11 experiments in this lab. The directions for each lab are on the desks. You will have 5 minutes to read the directions, perform the experiment, record your data, and reset the station.
DATA ANALYSIS: Conduct each experiment and look for changes. Use the data table below to record your findings. Decide whether each test is showing a physical or chemical change, and state the empirical evidence (dissolving, change of state of matter, production of gas, change of color, change of size, burning, etc.). By stating your reason for your observation, you will have crossed over from apprentice to proficient observations skills. After you have finished the test at each station, clean up the area and get it ready for the next group.
DATA ANALYSIS
STATION / OBSERVATION / PHYS? / CHEM? / EMPIRICAL EVIDENCE1 / the paper turned darker where the lemon juice was / / color changing
2 / iodine changed from orange color to black / / color changing
3 / salt disappears / / dissolving
4 / baking powder disappears / / dissolving
5 / milk becomes chunky / / precipitate forming
STATION / OBSERVATION / PHYS? / CHEM? / EMPIRICAL EVIDENCE
6 / vinegar and baking soda bubbles / / gas forming
7 / vinegar and chalk bubble / / gas forming
8 / wax melts on the hot plate, then hardens when removed from the heat / / changing state
9 / water boils and disappears / / changing state
10 / sugar melts, then turns brown / / / changing state (physical)
changing color (chemical)
11 / plastic shrinks to smaller size / / changing size
CONCLUSION:
Describe the different types of evidence you observed for chemical changes and for physical changes.
The physical changes that were observed include dissolving, size changes, and changes in the state of matter.
The chemical changes that were observed include color changes, solids forming, and gasesforming.
What conclusion can you draw about the difference between a physical and chemical change?
When a chemical changes occurs, a new substance forms. When a physical change occurs, the substance stays the same.
Was your hypothesis supported? Tell why it was or was not.
Answers will vary based on the hypothesis.
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