chocolate syrup and yeast flakes is it a physical or chemical change?
Combining chocolate syrup and yeast flakes would not result in a chemical change; it would be a physical change. This is because both chocolate syrup and yeast flakes are made up of molecules that remain the same and do not undergo a chemical reaction when mixed together.
What are some major signs about chemical change
Some major signs or indications that a chemical change has occurred include:
1. Change in color: The substance may change color or appearance, indicating a chemical reaction has taken place.
2. Formation of a precipitate: A solid substance may form and settle out of a liquid solution.
3. Evolution of gas: Bubbles or gas may be produced, leading to fizzing or foaming.
4. Release or absorption of heat: The reaction may be accompanied by a noticeable change in temperature.
5. Production of light or flame: A chemical reaction may produce light or result in the ignition of a substance.
6. Change in odor: The formation of new molecules can result in a distinct change in smell.
7. Irreversibility: Some chemical reactions are irreversible, meaning it is difficult or impossible to reverse the changes that have taken place.
It is important to note that not all of these signs may be present in every chemical change, but they are commonly observed.
What are major signs about physical change
Some major signs or indications of a physical change include:
1. Change in size, shape, or texture: The substance may be dissolved, crushed, or broken into smaller pieces, but its chemical composition remains the same.
2. Change in state: The substance may change from solid to liquid (melting) or from liquid to gas (evaporation), while still retaining its chemical composition.
3. Change in density: The substance may become more or less dense, but its chemical identity remains unchanged.
4. Dissolving: The substance may dissolve in a liquid solvent, forming a homogeneous mixture.
5. Change in magnetism: If the substance is magnetic, its magnetic properties may change due to external factors, but it would still be the same substance.
6. Change in temperature: A physical change can be accompanied by a change in temperature, but it does not indicate a chemical reaction has occurred.
7. Reversibility: Physical changes are generally reversible, meaning it is possible to change the substance back to its original state without any chemical reactions.
It is important to note that physical changes do not involve the formation of new substances and do not alter the chemical properties or composition of the substance.