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Biology Test 2

QuestionAnswer
The nucleus of an atom contains? protons and neutrons
Electrons move about the nucleus of an atom in regions called ___. electron clouds
Waster dissolves many ionic and molecular compounds because of its ______. polarity
The total number of atoms in a molecule of sucrose, C12H22O12 is _________. 45
A very strong base might have a pH of ________. 13
An atom of fluorine has nine electrons. Its second energy level has __________. seven electrons
What type of compound is made up of atoms held together by covalent bonds? molecules
You suspect that a chemical that you are testing in the lab is strongly acidic. What might be its pH? 2
Ionic and covalent compounds are alike in that they BOTH _____________. fill outer electron levels
Hydrogen and Oxygen combine to form what type of chemical bond? covalent bond
What number of valence electrons creates a stable arrangement of MOST atoms? 8
The atomic number for Calcium is 20. How many valence electrons does calcium have in their outer energy level? 2
The attraction between molecule of the same kind is called cohesion
The attraction of now type of molecule to a different type of molecule is called adhesion
Water has the ability to dissolve many types of substances. This capability has given water the title of being a? univesal solvent
If an element is considered to be "unreactive or inert", the reason for this could be ? The element has 8 valence electrons.
Atoms of the same element that have different numbers of neutrons in the nucleus are called ? Isotopes
Gardeners and farmers are sometimes concerned about soil being too acidic for some plants and not acidic enough for others. Which pH could be found in a soil that is slightly acidic? 5.8
Created by: user-2011471
 

 



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