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5 Written questions

5 Matching questions

  1. Difference between covalent and ionic bonds?
  2. What is the atomic mass?
  3. Difference between an element and a compound?
  4. What are the two strong chemical bonds?
  5. What is the atomic number?
  1. a The number of protons and neutrons in nucleus.
  2. b The number of protons in an atom.
  3. c A compound has characteristics different from those of its elements. Table salt, for example, is sodium chloride (NaCl), a compound composed of the elements sodium (Na) and chlorine (Cl) in a 1:1 ratio. Pure sodium is a metal, and pure chlorine is a poisonous gas. When chemically combined, however, sodium and chlorine form an edible compound.
  4. d Covalent bonds are the SHARING of electrons, whether it be equally or unequally
    Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
  5. e Covalent bonds (STRONGEST) and Ionic bonds.

5 Multiple choice questions

  1. Potential energy - stored energy due to location or structure; ready to use energy
    Kinetic energy - energy in motion or movement; currently using
  2. Different forms of the same element; they differ in number of neutrons, but they have the same # of protons and behave identically in chemical reactions
  3. One atom's attraction of the electrons within one covalently bonded molecule
    O > N > C > H
    Oxygen - most electronegative element
  4. Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge
  5. Protons - positive; in nucleus; 1 dalton (or amu)
    Neutrons - neutral; in nucleus; 1 dalton (or amu)
    Electrons - negative; found outside nucleus; 0 nothing

5 True/False questions

  1. What's a positive ion called? A negative ion?Positive ion = CATION
    Negative ion = ANION


  2. What bond does a SINGLE molecule of water have? (H₂O)Polar covalent bond.
    (it's when there's more than one polar molecule that hydrogen bonding takes place)


  3. What is an ion?A substance that cannot be broken down to other substances by chemical reactions.


  4. What is a chemical reaction? Be able to identify the products and reactants in a chemical reaction.Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.


  5. What are covalent bonds? Single? Double?Two or more atoms SHARING ELECTRONS.
    Single covalent bonds - sharing of one pair of valence electrons
    Double - sharing of two pairs of valence electrons