Gold id an element, symbol Au (see the Periodic Table.) All elements are substances but very few substances are elements.
it is a mixture
It is a pure substance.
Sugar
It is a molecule of the substance.
a pure substance is that which contains same atoms or same molecules..
Diamond ( an allotrope of carbon) is the hardest material known.
Sodium is a metal, very reactive, with a silvery-white appearance.
light if low heavy if high -peace
Carbon dioxide (CO2) is dissolved into the soda, as the carbon dioxide escapes a fizzing effect is produced.
That would be moisture in the oil.
first we eat the baby chicen then we eat the yolk and spit it out leaving a nice slimmy stubstance then we make a hard white shell and put the yolk in it.
Not exactly. A physical change is when a substance is changed, but can be reverted back to its original form. An example of this is water. If you heat up water it turn to water vapor (steam) and when it cools down, it turns back into water again. When you freeze water it turns to ice, but if you heat it up, it turns back to water. I think you're talking about chemical change. A chemical change is changing a substance to a new one and cannot be reverted back into its original form. An example of this is a burning paper.