Test Bank For Biology Connect An Australian Focus 5th Edition B Robert Knox

1. When electrons in excited orbitals lose energy, that energy canA. be used to drive another chemical process.

   B. emit light.

   C. be passed on to a neighbouring atom.

   D. All of the answers are correct.

   E. be used to drive photosynthesis in a leaf cell in sunlight.

2. An oxygen atom has 8 protons, 8 neutrons and 8 electrons.A. Its atomic number is 16.

   B. Its mass number is 8.

   C. It has 4 electrons in the first energy level (electron shell).

   D. It has 6 electrons in the outermost energy level (electron shell).

   E. It has 8 electrons in the outermost energy level (electron shell).

3. Atoms of the same element can exist in different forms called isotopes. The most common isotope of carbon is carbon-12 but it has two less-common isotopes, carbon-13 and carbon-14. The less-common isotopes haveA. the same number of electrons but more protons.

   B. the same number of protons but more neutrons.

   C. the same number of neutrons but more protons.

   D. the same number of protons but more electrons.

   E. the same number of neutrons but more electrons.

4. Ionic bonds are formed by theA. attraction between atoms with opposite polarity.

   B. transfer of electrons from one atom to another.

   C. sharing of electrons between oppositely charged ions.

   D. attraction between positively and negatively charged ions of the same element.

   E. sharing of electrons in the outer electron orbital of an atom.

5. Hydrogen bonds can form betweenA. carbon and hydrogen atoms.

   B. oxygen and hydrogen atoms in the same water molecule.

   C. oxygen and hydrogen atoms in adjacent molecules.

   D. hydrogen atoms in adjacent molecules.

   E. hydrogen atoms within the same molecule.