Chemical Change Lab Report
Chemical and Physical Changes in Matter
Purpose:
The purpose is to observe chemical and physical changes and to identify each.
Procedure:
Do experiments 1-8 as directed by the handout.
Data and Results: Experiment | Observations | Type of Change | Supporting Evidence | 1 | -After a few seconds, yellow smoke was produced-Wood splinters are becoming black-Bottom part of test tube has black color on the sides-Some woods splinters have been burned to ash-Middle of test tube has yellow color on the sides | Chemical | -The wood splinters turned to ash and they produced a gas | 2 | -Mass of copper in crucible = 10.26g-After 4 minutes, copper turned into silver color-Mass remained the same after 5 minutes over the burner, 10.26g | …show more content…
4 | -Crystals turned to liquid-Blue liquid changed into a green liquid-Gas was produced by the copper nitrate-A yellow gas filled the entire tube-Substance turned black-After adding 10 drops of HNO3 and heating gently, a yellow gas was produced-Smells like a swimming pool-Substance remained black | Chemical | -The copper nitrate changed from a blue color into a green color and then into black, produced a gas, and its smell changed when the HNO3 was added | 5 | -After being shaken, the mixture has salt floating around everywhere in the water-Solution started bubbling after a minute of burning-Solution sizzled and the water part of the solution evaporated, leaving behind just the salt | Physical | -The water and the salt were able to be separated after they were mixed together …show more content…
| Physical | -The sodium chromate and the nitrate solution weren’t chemically mixed, one was just covering the other and the sodium chromate only solidified |
Sample Calculation:
Conclusion:
1) Evidence that normally indicates a chemical change is when a gas is released and when the substance is put over the burner and it turns to carbon (ash).
2) A physical change in which a substance appears to change chemically is like when the salt water mixture began to bubble when put over the burner. It looks like the heat is changing the substance into something else, but it’s just evaporating the water and leaving behind the salt.
3) a) Boiling water – Physical
b) Leaves turning brown in the fall – Chemical
c) Making koolaid from a powder – Physical
d) Dry ice turning to a gas – Physical
e) Alka seltzer in water – Physical
f) Frying an egg –
Purpose:
The purpose is to observe chemical and physical changes and to identify each.
Procedure:
Do experiments 1-8 as directed by the handout.
Data and Results: Experiment | Observations | Type of Change | Supporting Evidence | 1 | -After a few seconds, yellow smoke was produced-Wood splinters are becoming black-Bottom part of test tube has black color on the sides-Some woods splinters have been burned to ash-Middle of test tube has yellow color on the sides | Chemical | -The wood splinters turned to ash and they produced a gas | 2 | -Mass of copper in crucible = 10.26g-After 4 minutes, copper turned into silver color-Mass remained the same after 5 minutes over the burner, 10.26g | …show more content…
4 | -Crystals turned to liquid-Blue liquid changed into a green liquid-Gas was produced by the copper nitrate-A yellow gas filled the entire tube-Substance turned black-After adding 10 drops of HNO3 and heating gently, a yellow gas was produced-Smells like a swimming pool-Substance remained black | Chemical | -The copper nitrate changed from a blue color into a green color and then into black, produced a gas, and its smell changed when the HNO3 was added | 5 | -After being shaken, the mixture has salt floating around everywhere in the water-Solution started bubbling after a minute of burning-Solution sizzled and the water part of the solution evaporated, leaving behind just the salt | Physical | -The water and the salt were able to be separated after they were mixed together …show more content…
| Physical | -The sodium chromate and the nitrate solution weren’t chemically mixed, one was just covering the other and the sodium chromate only solidified |
Sample Calculation:
Conclusion:
1) Evidence that normally indicates a chemical change is when a gas is released and when the substance is put over the burner and it turns to carbon (ash).
2) A physical change in which a substance appears to change chemically is like when the salt water mixture began to bubble when put over the burner. It looks like the heat is changing the substance into something else, but it’s just evaporating the water and leaving behind the salt.
3) a) Boiling water – Physical
b) Leaves turning brown in the fall – Chemical
c) Making koolaid from a powder – Physical
d) Dry ice turning to a gas – Physical
e) Alka seltzer in water – Physical
f) Frying an egg –