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Biology Terms - Chapter 2

Across
Physical change of two substances
Attraction between molecules of different substances
The diffusion of water molecules through a semipermeable membrane
Substance that is indigestible to humans
Speed up chemical reactions
Putting together of substances by living things
Potential of hydrogen; value of acid or base on a scale
Energy needed to start a reaction
Compounds before they chemically react with one another
A substance that is dissolved
A compound that donates hydroxide ions when dissolved in water
Affect the rate of a reaction but are not changed in the reaction
Water hating
Attraction between oppositely charged atoms
Fats or oils
Compounds that are the result of a chemical reaction
Attraction of like molecules of the same substance
The ability to do work
Down
All carbon atoms having two hydrogen atoms attached; cannot hold more
Anything that occupies space and has mass
Pure substances
A molecule with charged poles
The net movement of molecules from high to low concentrations
A substance that dissolves other substances
Homogenous mixture
Increase in randomness and loss of usable energy
Sharing of electrons; do not separate easily
Water loving
Using water molecules to separate molecular chains
A compound that donates hydrogen ions when dissolved in water
Chemically combined substance
Charged atom
A substance that combines with the greater amount of hydrogen ions or hydroxide ions
Smallest unit of an element