Friday, June 3, 2011

Help me check simple chemistry questions?

Compare and contrast the ease at which molecules are able to move relative to each other in the three states of matter.

A: Solids: they're compact and don't move.

Gas: they're spread apart and move easily

Liquid: they're compact and move easily



Q: Consider three 10-g samples of water: one as ice, one as a liquid, and on as vapor. How do the volumes of these three samples compare with one another? How is this difference in volume related to the physical state involved?

A: idk



Q: Classify the following as physical or chemical changes

A:

*A shirt scorches when you leave the iron on tone spot to long: CHEMICAL

*The tires on your car seem t be getting flat in very cold weather: PHYSICAL

*Your grandmother's silver tea set gets black with tarnish over time: CHEMICAL

*A bottle of wine left open turns to vinegar: CHEMICAL

*Spray-on oven cleaner converts grease in the over into a soapy material: CHEMICAL

*An ordinary flashlight battery begins to leak w/age and can’t be recharged: CHEMICAL

*Acids produced by bacteria in plaque cause teeth to decay: CHEMICAL

*Sugar will char if overheated while making homemade candy: PHYSICAL

*Hydrogen peroxide fizzes when applied to a wound: CHEMICAL

*Dry ice “evaporates” without melting as time passes: PHYSICAL

*Chlorine laundry bleaches will sometimes change the color of brightly colored clothing: CHEMICALHelp me check simple chemistry questions?Wrong about sugar. Charring is a chemical change, whether it's a shirt or sugar. They both separate a carbohydrate into carbon and water.



Ice has a slightly higher volume than liquid water of the same weight, so it is less dense and floats on top. Water vapor occupies approximately 22.4 l /mol, while 1 mole of liquid water at 25°C occupies 18 ml.
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