Lab Report Essay

614 WordsFeb 20, 20133 Pages
Inorganic Chemistry 1. A subatomic particle with a single positive electrical charge is protons. 2. A subatomic particle with a single negative electrical charge is electrons. 3. A subatomic particle which is electrically neutral is neutrons. 4. The nucleus of an atom is made up of _protons_ and _neutrons. 5. The number of electrons forming a charge cloud around the nucleus is (pick one of the following) greater than; equal to; smaller than the number of protons in the nucleus of the atom. 6. The atomic number of potassium (3919K) is_19_. This means that a potassium atom has _19 protons and 19_ electrons. 7. What is the atomic mass of K? ___39________. 8. The atomic mass represents the number of _protons_ and _neutrons. 9. The…show more content…
Match the descriptions with the types of bonds listed (Covalent; Hydrogen; Ionic) a. atoms lose electrons if they have just one or two electrons in their valence shells; they gain electrons if they need just one or two electrons to complete the valence shell as in K+CL- __Ionic bonds_ b. This bond is bridge-like; weak link between a hydrogen atom and another atom such as oxygen or nitrogen __hydrogen bond__ c. a pair of electrons is shared in this type of bond __covalent__ 22. The atoms of water have (polar covalent; nonpolar covalent; ionic) bonds Polar covalent and nonpolar covalent 23. As a result of the water molecule bond, each (hydrogen; oxygen) has a slightly negative charge and each (hydrogen; oxygen) has a slightly positive charge. Oxygen and Hydrogen. 24. Hydrogen bonds contribute to a property of water called cohesion or the tendency of water molecules to stick together. 25. What do we call water when other substances (solutes) dissolve in it? Polar Covalent. 26. What special bond (in water) opposes water’s molecular movement when water absorbs energy requiring water to have more heat added to raise its temperature? Hydrogen Bond. 27. Which pH is most acid (4; 7; 10) 4 28. Which pH has the highest concentration of OH- ions? (4; 7; 10) 10 29. Which solution has a pH closest to neutral? (Stomach acid; blood; lemon juice; soap, household bleach) Stomach acid 30. Pairs of weak acids and

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