UNIT 1- BIOL 230 ATHABASCA newest actual EXAM

UNIT 1- BIOL 230 ATHABASCA newest actual / EXAM QUESTIONS AND ANSWERS.verifed/graded a+ LATEST UPDATE

Why does water have a very high surface tension? - --- Answers----The hydrogen bonds that link neighboring water molecules give water considerable cohesion, the tendency of like particles to stay together.

chemical reaction - ---Answers----the process by which one or more substances change to produce one or more different substances, Dependent on valence electrons

Reactants - ---Answers----A starting material in a chemical reaction

products - ---Answers----The elements or compounds produced by a chemical reaction.

irreversible reaction - ---Answers----a chemical reaction where products cannot revert back to reactants

Reversible reaction - ---Answers----a reaction in which the conversion of reactants into products and the conversion of products into reactants occur simultaneously 1 / 3

chemical equilibrium - ---Answers----In a chemical reaction, the state in which the rate of the forward reaction equals the rate of the reverse reaction, so that the relative concentrations of the reactants and products do not change with time.

law of mass action - ---Answers----The rate of a chemical reaction is proportional to the product of the concentrations of the reactants

inorganic compounds - ---Answers----Compounds that do not contain carbon, small and simple, can have ionic or covalent bonds 55-60% of the body

Organic compounds - ---Answers----Compounds that contain carbon, Only covalent bonds 38-44% of the body

What makes water so important - ---Answers----Nearlyall of the body's chemical reactions occur in a watery medium

water is an excellent solvent for ionic or polar substances, gives water molecules cohesion(the tendency to stick together), and allows water to resist temperature changes. 2 / 3

what are the two different properties in a solution - ---Answers- ---There is a solvent (like water) and a solute (like sugar or salt)

Hydrophillic - ---Answers----solutes that are charged or contain polar covalent bonds (Love water) they mix/ dissolve easily

Hydrophobic - ---Answers----not water soluble, have many non polar bonds

Why are non polar covalent bonds hydrophobic? - ---Answers-- --

hydrophobic interactions - ---Answers----a type of weak chemical interaction caused when molecules that do not mix with water coalesce to exclude water

Where does water act as a lubricant? - ---Answers----mucus, pleura and pericardial cavities, it is also needed at joints, and helps moisten food and aid in digestion.

What are two types of mixtures? in relation to solutions - --- Answers----colloids (milk) and suspensions (blood)

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