21.1 Matter has mass and volume. Matter – anything that has mass and takes up spaceMass – the amount of matter in an objectWeight – the downward pull of gravity on an object
31.1 Continued Volume – the amount of space an object takes up Examples of matter –Examples of non-matter –
41.2 Matter is made of atoms. Atom – smallest basic unit of matter Subatomic particles – smaller particles that make up an atom; protons, neutrons, and electronsNucleus – the center of the atom; contains protons and neutrons
51.2 ContinuedProton – a positively charged particle found in the nucleusNeutron – a particle found in the nucleus that has no chargeElectron – a negatively charged particle found outside the nucleus
71.2 Continued B. Molecule – when two or more atoms combine together 1. A molecule can be made by combining alike or different atoms.2. A molecule is the smallest amount of a substance made of combined atoms that is considered to be that substance.
8Section 1.3 Pure substance – has only one type of substance Element – substance that contains only a single type of atomPeriodic table – organized list of the elements1. Mendeleev and Moseley were the two scientists who were involved in creating the modern periodic table.
91.3 ContinuedChemical Symbol – shorthand way of representing the elements; only one or two lettersAtomic number – number of protonsCompound – substance that consists of two or more different types of atoms bonded together
101.3 ContinuedMixture – combination of different substances that remain the same individual substances1. heterogeneous – have different properties in different areas2. homogeneous – evenly distributed; the same throughout
111.3 Continued Mixture Compound Substances Remain the same New substance formedSeparationBy physical meansBreaking bondsProportionsVaryFixed