However, two of their data points are “outliers” and fall far to one side of the expected relationship. What should they do? A) Do not show these points but write a footnote that the graph represents the correct data. B) Average several trials and therefore rule out the improbable results. C) Show all results obtained and then try to explore the reason(s) for these outliers. D) Throw out this set of data and try again. E) Change the details of the experiment until they can obtain the expected results. Answer: C Topic: Concept 1. 3 Skill: Synthesis/Evaluation 39) Which of the following is the best description of a control for an experiment?
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms. C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. D) outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom. E) an electron occupies a hybrid orbital located between the nuclei of two atoms. Answer: C Topic: Concept 2. 3 Skill: Knowledge/Comprehension 30) If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed?
The Essay on Atomic Theory Atom Electrons Thompson
In ancient Greek the word atom meant the smallest indivisible particle that could be conceived. The atom was thought of as indestructible; in fact, the Greek word for atom means "not divisible." Knowledge about the size and make up of the atom grew very slowly as scientific theory progressed. What we know / theorize about the atom now began with a core theory devised by Democritus, a Greek ...
B) Covalent bonds and ionic bonds occupy opposite ends of a continuous spectrum, from nearly equal to completely unequal sharing of electrons. C) Both involve electrical attraction between the electrons of one atom and the nucleus of the other atom. D) Ionic interactions remain when covalent bonds are broken in water. Ionic bonds are much stronger than covalent bonds. Answer: B Topic: Concept 2. 3 Skill: Synthesis/Evaluation 38) What is the difference between covalent bonds and ionic bonds? A) Covalent bonds are formed between atoms to form molecules; ionic bonds are formed between atoms to form compounds.
C) The solute molecules left behind absorb heat. D) Water molecules absorb heat from the surface in order to acquire enough energy to evaporate. E) The expansion of water vapor extracts heat from the surface. Answer: B Topic: Concept 3. 2 Skill: Knowledge/Comprehension 14) Why does ice float in liquid water? A) The high surface tension of liquid water keeps the ice on top. B) The ionic bonds between the molecules in ice prevent the ice from sinking. C) Ice always has air bubbles that keep it afloat. D) Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.
