Chlorine has seven electrons in its valence shell. The number of electrons it must gain to complete its valence shell is: one. two. three. seven. eight. Which of the following elements is NOT...

Quiz 2 atoms and molecules


Chlorine has seven electrons in its valence shell. The number of electrons it must gain to complete its valence shell is: one. two. three. seven. eight. Which of the following elements is NOT responsible for a significant portion of the mass of living organisms? C N O H S Isotopes differ from each other with respect to the number of: protons only. electrons only. neutrons only. both protons and electrons. both neutrons and protons. Use the figure below to answer the corresponding question. The type of bond illustrated is: an ionic bond. a polar bond. a single covalent bond. a hydrogen bond. a double covalent bond. Which covalent bond involves only 2 electrons (1 pair): single double triple single and double. single and triple. A pH of 4 is __________ times more __________ than a pH of 7. 3; basic 3; acidic 1000; neutral 1000; basic 1000; acidic Which of the following choices correctly identifies a reactant in the following chemical equation? C​6​H​12​O​6 ​+ O​2​ --> 6CO​2​ + 6H​2​O + energy C​6​H​12​O​6 O​2 H​2​O CO​2 Both (a) and (b) A solution having a pH of 6 would: have equal concentrations of hydrogen ions and hydroxide ions. have a higher concentrations of hydroxide ions than hydrogen ions. be slightly acidic. be slightly basic. be neutral. The difference between an electrically neutral atom and an ion is that: an ion has an unequal number of protons and electrons, while an atom has an equal number. an ion has an equal number of protons and electrons, while an atom has an unequal number. an atom has an unequal number of neutrons and protons, while an ion has an equal number. an atom has its electrons in orbitals, while an ion has its electrons in its nucleus. an atom must have an equal number of neutrons and electrons, while an ion does not. A stalk of celery is placed in a solution of blue colored dye. After one hour, the leaves have blue fluid in their veins. Which property of water is being demonstrated? adhesion and cohesion evaporation and cooling lower density as a solid than as a liquid high specific heat surface tension