2. Dissolved in water.
4. Insoluble solid or precipate.
Question #2 answer.
When adding HCl into sodium bicarbonate it is forming a new substance but when dry ice sublimes its only rearranging molecules.
Question #3 answer.
1. My finger prints
2. HCL in to NaOH.
3. Mixing rubbing alcohol with water.
Question #4 answer.
1. Solid yellow lead iodide and potassium nitrate.
2. Burning magnesium.
3. Forming crystals.
This lab helped us to learn the difference between chemical and physical changes. In a physical change, the original substances still exist and nothing new has been formed. In a chemical change, new products are formed and it is usually irreversible. Signs that a chemical change has occurred are a change in temperature, a change in odor, a solid is precipitated, it is irreversible or hard to reverse, a change in color, and the production of bubbles, indicating the release of a gas. This lab has introduced us to physical and chemical changes as well as indicators to them. This lab helped me to learn the difference between chemical and physical changes. In a physical change, the original substances still exists and nothing new has been formed. But in a chemical change, new products are formed and it’s usually irreversible. I have noticed temperature and color changes. The production of bubbles, indicates the release of a gas.