a mixture
A chemical change is when a substance is formed into an entirely new substance, with different properties, as such, a chemical change cannot be reversed. So in answer to your question, salt, in this case the solute (the substance that is being dissolved), is dissolved into water, a solvent (the substance that a solute is dissolved into), so you would think that a chemical change has taken place. But actually, a physical change (when something is changed, but keeps its properties, for example, when you break chalk in two, it is still chalk, only smaller), because if you heat the saltwater, then the water will evaporate, leaving the salt behind, in its original form.
Iron keeps its unchanged chemical properties, but in a mixture it might add new, mostly physical properties to the alloy, this is also true for the other elements in the mixture, eg. C or Ni, or Cr in steel alloys.
It is the atom.
Cell contents are separated from the external environment by the cell membrane. Cells are also separated by the external environment when they are in the bloodstream in the capillaries and veins.
it is an example of a inhibitor
Molecules
atom - smallest piece of an element that keeps its chemical properties; compound - substance that can be broken into elements by chemical reactions
Yes.
A physical change is when a substance changes, but still keeps its identity. When a chemical change occurs, the substance changes its identity.
A molecule is the smallest unit of a pure substance that can exist and still retain its chemical properties. An atom is the smallest unit of an element that can exist and still retain its chemical properties.
atom
A chemical change is when a substance is formed into an entirely new substance, with different properties, as such, a chemical change cannot be reversed. So in answer to your question, salt, in this case the solute (the substance that is being dissolved), is dissolved into water, a solvent (the substance that a solute is dissolved into), so you would think that a chemical change has taken place. But actually, a physical change (when something is changed, but keeps its properties, for example, when you break chalk in two, it is still chalk, only smaller), because if you heat the saltwater, then the water will evaporate, leaving the salt behind, in its original form.
It is a chemical change. It keeps its same chemical composition and is in a reversible state. You can remelt it and once again, make glass.
This is because when a substance, such as water, is changed to a solid (ice) it keeps its same, original properties! A chemical change involves changing the substance into a completely new substance. Water, on the other hand, can go from a solid, to a liquid, to a gas without changing its properties, only its state!
Tie
There is no electron rearrangement when a material evaporates, which is what defines a chemical change. Evaporation is the material's vapor pressure overcoming the particular force (Van der Waals, etc) that otherwise keeps it a liquid.
They are the epithelial tissues. They lines and covers body