Lab Equipment and Physical and Chemical Properties and Changes

For the Tuesday Chem Quiz

Safety Goggles

used to protect eyes, used when handling chemicals, heat, and glass

Beaker

Holds stuff, **not** for measuring

Test tubes

used to observe reactions or to conduct experiments, held in test tube rack

dropper

2 pieces, used to drop liquids drop by drop instead of quickly

Wash bottle

holds distilled water to rinse out glass

Graduated cylinder

Used to measure the volume of liquids

Crucible tongs

used to pick up hot stuff

Mortar and pestle

Used to crush and grind things

Stir rod

usually glass, used to stir things

Pipettes

used to transfer and measure liquids

Physical Property

A characteristic of a substance that can be observed by the 5 senses

Physical property examples

luster, color, odor, malleability, volume, density, texture, hardness, size conductivity, mass, melting point, boiling point, dissolving

Chemical Property

A characteristic of a substance that can only be observed in a chemical reaction

Chemical Property examples

Flammability, corrosiveness, will react to being heated or cooled, explosiveness, combustible, rusting, reactivity with water

Physical Change

No new substance is formed, can be reversed

Physical Change examples

Phase changes (melting to freezing), dissolving, cutting, ice melting into water, sharpening pencil, boiling water

Chemical change

A new substance is formed, can **not** be easily reversed

Chemical change examples

Formation of a gas (bubbling), new color, new odor, new taste, energy (heat or light) released or absorbed, formation of a precipitate, cooking meat, gasoline burning, bread molding

Precipitate

A solid formed from two solutions