Final answer:
Matter is any substance that has mass and takes up space. It can be classified into pure substances and mixtures. The amount of matter in a substance can be measured using the mole, which is the SI unit for the amount of substance.
Step-by-step explanation:
Matter is any substance that has mass and takes up space. It can be classified into two categories: pure substances and mixtures. Pure substances have a constant composition and properties, while mixtures are made up of two or more substances.
The amount of matter in a substance can be measured using a unit called the mole, which is the SI unit for the amount of substance. It measures the number of atoms, molecules, or formula units in a sample.
In chemistry, matter is made up of elements, which are substances that cannot be broken down into simpler substances. There are more than 100 known elements, and they can combine to form compounds.