I'll try to answer what I think you were trying to ask.
Different elements are different substances. Technically, different isotopes are different substances as well, but in practice the chemical differences between two isotopes of the same material are much smaller than the differences between two different elements.
All elements (and nearly all compounds) undergo state changes.
Shifting temperature. If its colder, the harder it will get because the particles will compress together. If its warmer, the substance will liquify (melt) or even turn into gas because the particles move apart from each other.
Density and color can vary while the substance remains the same. Density is mass per unit volume, which can change depending on pressure or temperature. Color can vary due to factors such as lighting conditions or impurities in the substance.
Density and volume are two physical properties that can vary even when the substance does not change. The density of a substance can vary depending on the pressure and temperature, while the volume can change with the shape or container that holds the substance.
In a "physical change" a new substance is not created. In a "chemical change" a new substance is created. This applies to changes in states of matter. For example, ice, water, and steam are all the same substance, even though they exist in three different states. The elements of which they are comprised do not change. Sometimes you may be able to precipitate elements out of a substance through a phase change. In a mixture of alcohol and water you can fairly quickly boil out the alcohol.
Boiling water is a physical change, not a chemical change. The water molecules remain the same chemical composition (H2O) even though they change state from a liquid to a gas. This change is reversible.
On heating there will be a change in the physical state not chemical composition. So the number of atoms will be the same even after change in state.
False. In a physical change, the substance remains the same even though there may be a change in appearance or state. The molecules of the substance do not rearrange themselves to form a new substance.
Shifting temperature. If its colder, the harder it will get because the particles will compress together. If its warmer, the substance will liquify (melt) or even turn into gas because the particles move apart from each other.
Density and color can vary while the substance remains the same. Density is mass per unit volume, which can change depending on pressure or temperature. Color can vary due to factors such as lighting conditions or impurities in the substance.
Density and volume are two physical properties that can vary even when the substance does not change. The density of a substance can vary depending on the pressure and temperature, while the volume can change with the shape or container that holds the substance.
In a "physical change" a new substance is not created. In a "chemical change" a new substance is created. This applies to changes in states of matter. For example, ice, water, and steam are all the same substance, even though they exist in three different states. The elements of which they are comprised do not change. Sometimes you may be able to precipitate elements out of a substance through a phase change. In a mixture of alcohol and water you can fairly quickly boil out the alcohol.
Density and temperature can both vary for a substance without changing the identity of the substance. The density of a substance can change with temperature, pressure, or the presence of impurities, while the temperature of a substance can change due to external factors like heating or cooling.
It is in classical mythology, but not in reality. In reality fire is not even a substance but a chemical reaction between oxygen and some flammable substance.
Iodine is an element, so a pure substance, not a mixture, (so even not homogeneous).
In a physical change, the substance's chemical properties remain the same even though its appearance or state may have changed. Signs of a physical change can include changes in shape, size, or phase (solid, liquid, gas) without altering the chemical composition of the substance.
its an element. an element is a pure substance. apple juice is a pure substance since it doesn't have other chemicals and such in it orange juice is not since its got all that pulp stuff in it, even without the pulp its still thick.
Mixture, because it is mixed with all sorts of chemicals, such as smog, and or pollen.Mixture is NOT a pure substance, because to be a pure substance, it can't be mixed with anything.