Presentation on theme: "September 9, 2009 Obj – Differentiate between various forms of matter. Warm-Up – What is matter? Reminders – HW – Elements, Compounds & Mixtures Graphing."— Presentation transcript:
September 9, 2009 Obj – Differentiate between various forms of matter. Warm-Up – What is matter? Reminders – HW – Elements, Compounds & Mixtures Graphing Quiz today!
What is Matter?
Matter Chemistry is the study of matter and how it changes Matter is anything that has mass and occupies space
Classifying Matter Organize the items on your desk into groups based on what you know about them.
September 11, 2009 Obj – Understand Matter Warm-Up – Differentiate between a pure substance and a mixture. Reminders – Matter Quiz on Monday
Classifying Matter – Concept Map Prepare a concept map showing the relationships among the following terms and the items in front of you. Include these terms in your concept maps: Compound, Element, Heterogeneous, Matter, Mixture, Homogenous, Pure substance, Solution
Pure Substances Pure Substances: matter with a fixed definite composition with exact definite properties. (example: distilled water) Elements Compounds
Pure Substances: Elements Elements - substances that cannot be broken down into simpler substances (pure) Atoms – smallest unit of an element that still retains its properties.
Pure Substance: Compounds Compounds -made of atoms of more than one element that have bonded together chemically (Example: Salt) Molecules are the smallest unit of a compound
Mixtures The properties of a mixture can vary because the composition of a mixture is not fixed. Mixtures can retain some of the properties of their individual substances. The properties of a mixture are less constant than the properties of a substance.
Heterogeneous and Homogeneous Mixtures Homogeneous mixture = a mixture that contains more than one type of matter and is the same throughout. Heterogeneous mixture = a mixture that contains more than one type of matter and is not the same throughout
September 14, 2009 Obj – Explore separating matter Warm-Up – What types of matter can be separated and why? What types of matter cannot be separated? Reminders – Quiz today, CE due Friday
Solutions, Suspensions and Colloids Based on the size of its largest particles, a mixture can be classified as a solution, a suspension, or a colloid. Solution: when substances dissolve and form a homogeneous mixture, the mixture that forms is a solution. Sugar in water Suspension – a heterogeneous mixture that separates into layers over time. Ex. Sand and water Colloid – a combination of small particles that do not separate as in a solution and larger particles that do separate as in a suspension. Ex. Milk, it will separate over time.
Separating Mixtures Filtration – separates mixtures on the basis of particle size. Ex. Using a coffee filter to separate the ground coffee from the water when making a cup of coffee. Distillation – separates a mixture in a solution by boiling points. Ex. Evaporating the water from salt water separates the salt from the water leaving the salt behind.