Record your data either in your lab notebook or in the space below. Step
Material
Change(s) Observed
Type of Change (Physical/Chemical)
Reasoning
2
Calcium carbonate
Particle size changed (it was pulverized and became a powder)
Physical Change
It did not change its identity, only the particle size.
3
Calcium carbonate and hydrochloric acid
Color changed; created a gas; bubbles
Chemical
Indicated by the production of bubbles the calcium carbonate was transformed into a different substance
4
Water
Bubbles; gas
Physical
It underwent a phase change but it retained its original properties
5
Copper sulfate pentahydrate
Gas; color change
Chemical
Gas is given off and color changed – these are indicators of a color change
6
Iron filings and sulfur
Color Change; iron is removed
Physical
The color change occurred but each solid kept its original properties.
7
Lead nitrate and potassium iodide
Color change; created a solid substance
Chemical
When the color change and solid formation occurred, its strong evidence that the two made a new substance
8
Magnesium and hydrochloric acid
Bubbling; increased temp by 33 degrees; strip dissolved
Chemical
The temp changes; the magnesium disappears, and a gas is produced, this indicates a chemical change
9
Candle
Wax melts (drips); wick is burned ‘disappears’; light is produced
Chemical and physical
The wax changes shape (physical change); heat and light is produced (chemical change)
can you analysis and write a conclusion for it?