mass
No substance always has the same composition and properties, unless that substance is only considered in one of the various phases of matter. An element would be the logical choice, but many compounds and even solutions are the same no matter what (of course dependent on phase).
Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
Substance
Substance is any matter that exists around us. The properties of a substance remain same throughout.
No, as density also depends on the state of matter in the sample of the substance.
pure substance
Because -- You can have a large mass of copper or a small mass of copper, so there's no single mass that always goes with copper, or any other substance. -- You can have a large volume of uranium or a small volume of uranium, so there's no single volume that always goes with uranium, or any other substance. But ... -- No matter whether you have a lot of steel, or silver, or aluminum, or just a little bit of steel, or silver, or aluminum, the same substance will always have the same density no matter how much of it you have. The same density always goes with the same substance, regardless of how much mass or how much volume of it there is.
No. Density is a characteristic property, so there it is always the same no matter how much of the substance is present.
I believe it is an element.
Density of the substance will always stay the same. Density of the object will also stay the same if solid, no matter the size, but not if it is carved out. That is why a steel boat can float
Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
This question cannot be answered per the Law of Conservation of Matter. It doesn't matter what state a substance is in, it will always have the same atoms and in the same number. A substance that goes from liquid to gas does not "lose" some atoms in the process.
No substance always has the same composition and properties, unless that substance is only considered in one of the various phases of matter. An element would be the logical choice, but many compounds and even solutions are the same no matter what (of course dependent on phase).
Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
A substance in which the exact combination of elements is always the same, is called a compound.
If matter is made up of two or more elements and has the same ratio of atoms no matter the amount of the substance it is a compound.
Substance