Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
A pure substance consists of only one type of element or compound. The composition of a pure substance always stays the same, with a fixed ratio of its constituent particles.
a compound always has the same chemical formula
The chemical composition or properties of the substance remain constant regardless of the quantity present.
When water freezes, it changes from a liquied water molecule (H2) to ice, but it is still a water molecule. So, yes, the matter stays the same on a molecular level.
The composition of pure substances, such as elements and compounds, are always the same. The composition of mixtures can vary.
physical change
The compsitions stays the same :0
Matter can not change. Its weight always stays the same NO MATTER WHAT, and it can be moved
pure substance
A pure substance consists of only one type of element or compound. The composition of a pure substance always stays the same, with a fixed ratio of its constituent particles.
Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
I believe it is an element.
a compound always has the same chemical formula
False (E=mc^2 for example...)
The chemical composition or properties of the substance remain constant regardless of the quantity present.
nothing, atoms are always moving.
The idea of atoms explains the conservation of matter. In chemical reactions, the number of atoms stays the same no matter how they are arranged. So, their total mass stays the same.