Because water is a compound, a type of pure substance, which has a definite composition.
The composition of pure substances, such as elements and compounds, are always the same. The composition of mixtures can vary.
No chemical formulas ever change. If there are different elements in a compound, it ceases to remain the same compound, and becomes a new compound.The chemical formula for quartz is SiO2. That is, always was, and always will be the chemical formula for quartz.
Lactose and sucrose share the same chemical composition but differ in molecular structure. Such molecules are called isomers.
Definite chemical composition is when a mineral is made of the same material throughout. Basically when a mineral is only made of one material all the way through, not part iron in one part and then gold in the rest.
Rusted iron does not always have the same chemical composition. The rust itself always contain both iron and oxygen, but the proportions between these two elements can vary considerably. If there is plenty of oxygen and time, the rust itself approaches the composition of pure ferric oxide, with formula Fe2O3. Unless the original iron was very thin, however, some un-rusted iron always remains, so that the total composition of the rusted iron overall is still uncertain, unless measured for a particular sample.
They have the same chemical composition of H2O.
The chemical composition of water remain constant.
Water as a liquid and water as a gas (vapors) have the same chemical composition.
They all have the same chemical composition, ie, they are all H2O.
It doesn't have one. Shale is a mixture and doesn't always have the same composition. Only elements have chemical symbols
No. The chemical composition remains the same.
They all have the same chemical composition, ie, they are all H2O.
They are roughly the same. If they are from the same source of magma, they could be nearly identical in chemical composition.
Chemical changes are those in which the chemical composition of a substance changes during the process. But when steam turns into water or vice versa, only the physical state of the substance undergoes a change but the chemical composition remains same. Thus steam turning into water is a physical change.
No. Diorite has the same composition as andesite while Rhyolite has the same composition as granite.
Any particular isolated sample of a mixture has a definite chemical composition, but the general idea of a mixture, even of the same materials, implies variability in possible chemical composition.
The composition of pure substances, such as elements and compounds, are always the same. The composition of mixtures can vary.