Presentation on theme: "Chemistry the study of the properties of matter and how matter changes"— Presentation transcript:
1 Chemistry the study of the properties of matter and how matter changes Matter – anything that has mass and occupies space.Substance – a single kind of matter that is pure. It has a specific composition and a specific set of properties.Examples: Table Salt, Table Sugar, and Baking Soda
2 Describing MatterPhysical Properties - characteristics of a pure substance that can be observed without changing it into another substance.Examples: Change in Physical State, Texture, Color, Shape, Hardness, Flexibility, Luster, etc.
4 Chemical Properties - a characteristic of a pure substance that describes its ability to change into different substancesFlammability (Combustion)Ability to React (Oxidation/Tarnishing)New Substances, New Properties
6 ElementsElement – a pure substance that cannot be broken down into any other substance by chemical or physical means.Elements are represented by one or two letter symbols such as C for carbon, H for hydrogen, Fe for iron, and Cu for copper.
7 Particles of Elements - Atoms Atom – the basic particle from which all elements are made.
8 When Atoms CombineChemical bond – the force of attraction between two atoms.Molecules – groups of two or more atoms held together by chemical bonds.
9 CompoundsCompound – a pure substance made of two or more elements chemically combined in a set ratio.Chemical formula – shows the elements in a compound and the ratio of atoms.Examples: H2O (water), NaCl (table salt)CO2 (carbon dioxide), andC12H22O11 (table sugar)
10 MixturesMixture – made of two or more substances that are together in the same place but are not chemically combined.Each substance in a mixture keeps its individual properties. Mixtures are not combined in a set ratio.
11 Heterogeneous Mixtures Heterogeneous mixture – a mixture in which you can see individual partsExamples:
12 Homogeneous MixturesHomogeneous mixtures – a mixture that is so evenly mixed that you can’t see the different partsExamples:
13 Ways to Separate Mixtures Use a magnetFilter the mixtureUse distillationEvaporation
14 Measuring Matter Mass - the amount of matter in an object Units: g or kgVolume - the amount of space matter occupies.Units: L, mL, and cm3Density - the mass of a material in a given volume. (formula: mass/volume)Units are g/mL or g/cm3