Ch. 16 Vocabulary Atom – the smallest particle of an element that can exist alone or in combination with other atoms. Video on Atom Compounds – substances made of two or more elements that cannot be separated by physical means. Difference Between Mixture & Compound, Example Types of Matter Elements – substances that contain only one kind of matter. Activity on Mixture, Compound, or Element, Example Types of Matter Heterogeneous mixture – a mixture in which every sample of it might have a different composition. Activity on Mixture, Compound, or Element, Example Types of Matter, Video on Types of Mixtures Homogeneous mixture – a mixture in which every sample of it has the same composition. Activity on Mixture, Compound, or Element, Example Types of Matter, Video on Types of Mixtures, Law of conservation of mass – states that the total mass of products of a reaction is equal to the total mass of reactants. Matter – anything that has mass and takes up space. Activity on Mixture, Compound, or Element, Example Types of Matter, Example of States of Matter, Video on Matter Mixture – substance that contains more than one kind of matter. Difference Between Mixture & Compound, Activity on Mixture, Compound, or Element, Example Types of Matter, Video on Mixtures Molecule – the smallest particle of a compound that retains the properties of the compound. Substance – a mixture that cannot be separated into different kinds of matter using physical means.