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I think it just means by light being instanious is that it will still show even really dark areas.... I think.... confused

Does anyone know what the sines of a chemicl reaction are. I have a test on them this week and I have no idea.

Off the top of my head I know there is thermal change, color change, substance change, Bubbles of gas appear, A precipitate forms, Light is emitted, A change in volume occurs, A change in electrical conductivity occurs, A change in melting point or boiling point occurs, A change in smell or taste occurs... Did I miss any?

Earth or other fine matter in fine, dry particles
or
any finely powdered substance, like sawdust

Hope I helped!

I feel like typing. *waves hands in the air* As somebody said already, it isn't. Within a vacuum, meaning there is no matter at all such as air or anything, light travels at a fixed speed of 299,792,458 meters per second or 670,616,629.384 miles per hour. When it travels through matter such gases, liquids, and solids, it is slowed down.

By saying that the speed of light is fixed, that means no matter what speed you are traveling relative to say a particle of light - a photon - assuming this is a vaccumed system as without that things get a bit more complicated, it will always be traveling at the speed noted above. You could never under any circumstances theoretically catch up to a beam of light traveling 300 million meters per second. As you'd speed up, time around you would slow down, but not for the light particle as it zips away. Time would be going slower for you and faster for the photon.

The polarity of a molecule is determined by whether its electrons are evenly distributed or if they are being pulled/pushed towards any specific part of its structure. Do a search for VSEPR (Valence-shell Electron-pair Repulsion) and that'll bring up some information about how to predict a molecule's shape based on the number of paired and unpaired electrons that exist within it. Once you know its shape, you can make a reasonable prediction concerning its polarity. There is a lot of information on this page; what I said was just the basics!

how do you make acne go away in a day or two. is the viniger and preporation H theory true?

I don't know about that...but I have a home remedy book at home, when I'll check it out and let ya know what I find...

*trying to review for my final right now*

xd