You think probable to a chemical compound.
A chemical compound may be a gas (CH4), a liquid H2O) or a solid (U3O8).
A substance
Physical mixture
A property of a pure substance is fixed composition. This means that the substance is made up of only one type of molecule or atom throughout, with no variation in its chemical composition.
You think probable to a chemical compound.
Matter in which the composition is not fixed is known as a heterogeneous mixture. In such mixtures, the individual components can be physically separated and have varying proportions. Examples include salad, sand and gravel, or air with varying pollutants. Unlike pure substances, the properties of heterogeneous mixtures can change based on their composition.
The type of matter and it's arrangements in an object.
Composition.
A substance is any matter that has a fixed composition and definite properties. This means that substances are made up of specific elements in a certain ratio, and they exhibit unique characteristics that can be used to identify and describe them. Examples of substances include water (H2O), salt (NaCl), and oxygen (O2).
Fixed composition refers to a mixture where the components are present in a specific and unchanging ratio. This means the proportion of each component in the mixture remains constant regardless of the amount of the mixture present. Fixed composition is often found in chemical compounds where the elements are combined in a defined ratio.
The composition of an object refers to the type of matter that makes up the object and the way that the matter is arranged. It encompasses the elements, compounds, and structures present in the object.
Composition for sure
This looks like a pretty basic question, although asked out of context, it is tricky. The same composition is called "definite" composition. The more technical term should make us think of the classification of matter. Pure substances have definite composions as opposed to mixtures that have variable composition. Your answer is pure substances. Pure substances can be either compounds, made of 2 or more kinds of atoms or elements make of 1 kind of atom.