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Chemical Reactions Performance Task
Description: A student conduct...
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Chemical Reactions Performance Task
Description: A student conducted two different demonstrations in their science class that started with copper chloride (CuClâ). They have provided you with the following data tables to help you determine if a physical change or chemical reaction occurred during the demonstrations.
Demonstration 1:
Reactants
substances at beginning of reaction
Products
substances at the end of the reaction
Substance
(Chemical Formula)
Copper Chloride
(CuClâ)
Water
(HâO)
Copper Chloride
(CuClâ)
Water
(HâO)
Properties
Density: 2.51 g/cmÂł
Melting Point: 100ÂșC
Boiling Point: 993ÂșC
Density: 1 g/cmÂł
Melting Point: 0ÂșC
Boiling Point: 100ÂșC
Density: 2.51 g/cmÂł
Melting Point: 100ÂșC
Boiling Point: 993ÂșC
Density: 1 g/cmÂł
Melting Point: 0ÂșC
Boiling Point: 100ÂșC
Based on the patterns (similarities and differences) in the properties of the reactants and products in the table above, is this a physical or chemical reaction? Cite specific evidence from multiple properties in the data table to support your answer. (5pts)
Claim
Evidence
Reasoning
Demonstration 2:
Reactants
substances at beginning of reaction
Products
substances at the end of the reaction
Substance
(Chemical Formula)
Copper Chloride
(CuClâ)
Iron
(Fe)
Iron Chloride
(FeClâ)
Copper
(Cu)
Properties
Density: 2.51 g/cmÂł
Melting Point: 100ÂșC
Boiling Point: 993ÂșC
Density: 7.86 g/cmÂł
Melting Point: 1538ÂșC
Boiling Point: 2682ÂșC
Density: 3.16 g/cmÂł
Melting Point: 677ÂșC
Boiling Point: 1023ÂșC
Density: 8.96 g/cmÂł
Melting Point: 1085ÂșC
Boiling Point: 2562ÂșC
Based on the patterns (similarities and differences) in the properties of the reactants and products in the table above, is this a physical or chemical reaction? Cite specific evidence from multiple properties in the table to support your answer. (5pts)
Claim
Evidence
Reasoning
Using the data from Demonstrations 1 and 2, fill out the table below to describe the difference between a physical and chemical reaction in terms of the rearrangement and/or conservation of atoms and molecules. Choose conserved or not conserved for atoms. Choose rearranged or not rearranged for molecules. (4pts)
Physical Changes
Chemical Reactions
Atoms:
(conserved/not conserved)
Molecules
(Rearranged/Not rearranged)
We have covered a lot throughout this Chemistry unit! Is there anything else youâd like to share with your teacher that was not asked on this final assignment? Write down anything else you feel you learned in the box below. (2 pts)
Optional: What questions do you still have about the Chemical Reactions Unit?
Answers: 1
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