Age Spots Cause
Question by Ryoma Echizen: 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?
Q: Classify the following as physical or chemical changes
*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: CHEMICAL
Answer by Jerry M
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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