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Study Guide Answers

1.     What is a nucleus made up of?
     Protons and neutrons
2.     Name two molecules made by living organisms.
     DNA, Sugars, Chlorophyll
3.     Electrons are negatively charged. (true/false)
     True
4.     What are noble gases?
     Atoms with an outer level full of electrons.
5.     A(n) _____________ is a particle that cannot be broken down onto another substance.
     Atom
6.     There are how many different, naturally occurring types of atoms.
     92
7.     Pencil lead, fireplace ashes and diamonds are all made up of ________.
     Carbon atoms
8.     What is a covalent bond?
     Two atoms sharing one or more electrons
9.     The atomic number is the sum of the protons and neutrons in a given atom. (true/false)
     False?atomic mass
10.     A(n) ___________ atom emits light when heated.
     Tungsten
11.     What are molecules?
     Atoms bonded with other atoms
12.     Two of the same types of atoms combine to form ___________.
     Chemical elements
13.     What naturally occurring element has the highest number of protons with 92?
     Uranium
14.     Elements on the periodic table are arranged by atomic number. (true/false)
     True
15.     What is an ozone molecule?
     Three oxygen atoms bonded together. O3
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.