the following is a script from "rare earth elements" which aired on march 22 2015. lesley stahl is the correspondent. graham messick and kevin livelli producers.
im gonna give you an example: chemical change is when water is transformed into hydrogen gas and oxygen gas. physical change is when you transform water into ice or steam (solid-liquid-gas). that means that physical change is transforming a solid
melting is a physical property because it only changes the physical state of the substance such as wax but does not change its physical or chemical properties.
"the clock starts ticking when the ice melts away" stone said. matching the isotopic date with the altitude of where the rock was found gives the researchers a gauge of how fast the ice is melting.
the change in the state of matter between solid liquid and gas are not chemical changes. the melting point of a substance silver in this is a physical characteristic.
appliance science: the firm chemistry of gelatin. how does a single chemical transform water into the tasty treat called jell-o we look at the chemistry of gelatin the chemical behind jell-o.
melting of any element including iron is a physical change. melting is just a transition between states of matter from solid to liquid. the solid state of iron can be regained if the liquid
physical changes are about energy and states of matter. chemical changes happen on a molecular level. melting a sugar cube is a physical change because the substance is still sugar.
yes. a physical property or change relates to the shape state etc of a substance. if you melt lead it is still lead. a chemical change would be rearranging the atoms of lead and another element