Biology 106 Exam 1 Latest Update Graded A+

Biology 106 Exam 1 Latest Update Graded A+ matter anything that takes up space and has mass element basic building block of matter atom smallest unit of an element composed of protons molecule atoms of same type bonded together compound different atoms bonded together all compounds and molecules, not all molecules are compounds. chemical bond attraction between atoms that enables the formation of molecules. covalent bond a principal force that holds atoms together, electrons are shared. may be single, double, triple. ionic bond attraction between oppositely charged atom. donating or accepting electrons. hydrogen bond weak covalent bond, usually between H+ and O2 or N2. responsible for properties of H20. water universal solvent, substances dissolve into it. solute dissolved substance solution solvent and solute hydrophilic molecule that attract H20 hydrophobic cannot attract H20 polar slightly changed yet neutral molecules, dissolve in H20 nonpolar electrically neutral, don't dissolve in H20 adhesion H20 to surface cohesion H20 to H20 acid/base molecule that donates H+ in H20/OH+ pH scale measures amount of hydrogen