Transcript Classification of Matter
Classification of Matter Chapter 15
Composition of Matter – Sec. 1 Pure Substances – Same composition throughout – Either an element or compound Element – All one type of atom – Everything made of atoms Compound – Atoms of two or more elements
chemically bonded
together
Composition of Matter Mixtures – Made of two or more substances that can be easily separated by
physical
means Heterogeneous Mixture – Different materials can be seen easily – Granite, concrete, vegetable soup Homogeneous Mixture (Solution) – Blended evenly throughout – Vinegar, Kool-aid
MATTER yes Mixtures Can it be separated?
no Substance Homogeneous Mixture Air, sugar water, stainless stell Heterogeneous Mixture Granite, wood, blood Compounds Water, sodium chloride Elements Gold, aluminum
Mixtures Colloid ~ heterogeneous – Particles larger than solution but not heavy enough to settle out – Milk, paint, fog and smoke Detecting Colloids – – Pass a beam of light through it Colloid – See beam Solution – Cannot see beam Particles big enough to scatter light –
Tyndall Effect
Mixtures Suspension ~ heterogeneous – Not solution, not colloid – Muddy pond water – Heterogeneous mixture with a liquid and visible particles that settle
Properties of Matter Section 2
Physical Properties Def: characteristic observed without changing the identity of the material – Ex: color, shape, size, density Appearance Behavior – Magnetic, malleable, flow of liquid
Separating Mixtures Sand and Rock mixture?
– Filter or sift Iron filings and Aluminum mixture?
– Magnet
Physical Change Change in size, shape or state of matter and identity is same – Solid to a liquid?
– Yes
Freeze Melt Condense Evaporate Solid Liquid Gas
Physical Change How to get pure water from salt water?
– Distillation – evaporate liquid and then recondense it
Chemical Properties and Changes
Chemical Property
– can be observed only by changing the substance – Flammability, reactivity, decomposition
Chemical Change
– change where a NEW substance is formed Weathering – Physical or Chemical Change?
– Both!
Law of Conservation of Mass Matter is neither created nor destroyed during a chemical reaction Mass of all substances before = mass of all substances after change