Which of the following statements about addition and condensation polymers is true?        Both addition polymers and condensation polymers contain all of the atoms of the monomers.
       Both addition polymers and condensation polymers lose some atoms from the original monomers when the polymer is formed.
       Addition polymers contain all of the atoms of the original monomers, but condensation polymers do not.
       Condensation polymers contain all of the atoms of the original monomers, but addition polymers do not.
       None of the above

2. The process of positron emission can be considered as the        conversion of a neutron to a proton and a positron. The positron is emitted.
       conversion of a neutron to a proton and an electron. The electron is emitted.
       conversion of a proton to a neutron and a positron. The neutron is emitted.
       conversion of a proton to a neutron and a positron. The positron is emitted.
       conversion of a proton to a neutron and electron. The proton is emitted.


3. odium-24 has a half-life of 15 hours. How much of a 40 mg sample would remain after two half-lives?        0 mg
       2.5 mg
       5 mg
       10 mg
       20 mg

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