Water and ph: 1- Each water molecule is joined to _____ other water molecules by ____ bonds. A two ... hydrogen B four ... hydrogen C three ... ionic D four ... polar covalent E two ... polar covalent 2- The unequal sharing of electrons within a water molecule makes the water molecule _____. A change easily from a liquid to gaseous form B ionic C hydrophobic D polar E have a low surface tension 3- The tendency of an atom to pull electrons toward itself is referred to as its _____. A electronegativity B covalency C ionic potential E polarity F tonicity 4-How did hydronium form? A Two water molecules bonded. B A water molecule gained an hydrogen ion from another water molecule. C Evaporation. D A hydrogen molecule bonded with an OH- molecule. E A water molecule split in half. 5-Which of these is the correct equation for the dissociation of water? A H2O + H2O H3O+ + OH- B H+ H2O + H2O+ C H2O + H2O+ H2O + OH- D H2O H+ + OH- E H2O + OH- H2O+ 5-What is the charge on a hydronium ion? A +1 B +2 C 0 D -1 E -2 6-What is the charge on a hydroxide ion? A +1 B +2 C 0 D -1 E -2 . What is a buffer? A. A substance that encourages change in pH B. A substance that resists change in pH C. A substance that speeds up a chemical reaction D. A substance that stops a chemical reaction 9- How does water act in most solutions? A. It is a universal solute, dissolving mostly ionic or polar covalent substances B. It is a universal solvent, dissolving mostly ionic or polar covalent substances C. It is a universal solute, dissolving mostly non-polar covalent substances D. It is a universal solvent, dissolving mostly non-polar covalent substances Which of these is true? A. As pH increases, [H+] decreases B. As pH increases, [H+] increases C. As pH decreases, [H+] increases D. Both A and C
Posted on: Fri, 02 May 2014 07:52:18 +0000
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