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1) which of the following is the hoh bond angle in water, h2o? a.109.5o b.120.0o c.104.5o d.90.0o 2) which of the following is true when comparing two electrons which are in different shells of an atom? a.the electron in the […]

1) the ammonium ion has the formula nh4+. how many nonbonding electrons must be shown in the lewis structure of the ammonium ion? a.0 b.4 c.8 d.9 2) sodium is a highly reactive metal and chlorine is a toxic gas, […]

1) which of the following have been associated with prolonged treatment with drugs such as premarin or provera? a.an increased risk of heart problemsc.both a and b b.an increased risk of uterine cancerd.neither a nor b 2) which of the […]

1) carbonic anhydrase is involved in which of the following? a.binding co2 to hemoglobinc.both a and b b.converting co2 to carbonic acidd.neither a nor b 2) examine the following image representing the structure of a compound. if the larger sphere […]

1) the following represents carbonic acid, an important part of the buffer system in blood. how many total valence electrons were used in constructing this structure? a.24 b.12 c.17 d.22 e.none of these 2) atoms of which of the following […]

1) it is commonly assumed that the isotopic abundances of a particular element are independent of the source of the element. if isotopic abundance does vary with location what is the consequence of that observation? a.nothing, the observation is totally […]

1) strontium-90 is a radioactive isotope which is particularly hazardous. which of the following statements is true about an atom of strontium-90? a.it contains 52 neutrons. b.it contains 52 protons. c.it contains 90 neutrons. d.it contains 90 protons. 2) which […]

1) which of the following enzymes is(are) involved in the transport of co2 by blood? a.carbonic anhydrasec.both a and b b.hemoglobind.neither a nor b 2) which of the following best describes the properties of the elements? a.chemical and physical properties […]

1) which of the following correctly represents the electronic configuration of sulfur? a.1s22s22p63s23p4 b.1s22s22p63s23px23py13pz1 c.[ne]3s23p4 d.all of them 2) consider the following reaction involved in carbon dioxide transport in the blood. what happens to this reaction when the partial pressure […]

1) a student is attempting to draw several resonance structures for a species. which of the following is allowed? a.change the connectivities of the nuclei. b.change the number of paired and unpaired electrons. c.both a and b d.neither a nor […]

1) which of the following elements is named for a country? a.fr b.ge c.po d.all of them 2) which of the following types of orbitals come in sets of seven? a.s b.p c.d d.f answer: d 3) how many electrons […]

1) although atoms are the smallest unit of an element, relatively few elements can be found in nature as individual atoms. which of the following elements can be found as individual atoms? a.hydrogen b.iron c.krypton d.sulfur 2) in the “ous/ic” […]

1) what is the correct systematic name for feco3? a.ferric carbonate b.ferrous carbonate c.iron(i) carbonate d.iron(ii) carbonate 2) the toxic gas hydrogen cyanide has the formula hcn. how many nonbonding electrons must be shown in the lewis structure of hydrogen […]

1) feso4 is commonly used to treat iron deficiency. which of the following is the correct name for this compound? a.iron sulfate b.iron(ii) sulfate c.iron(iii) sulfate d.iron sulfur tetroxide 2) which of the following types of orbitals can hold 10 […]

1) strontium-90 is a radioactive isotope which is particularly hazardous. which of the following statements is true about an atom of strontium-90? a.it contains 38 neutrons. b.it contains 38 protons. c.it contains 90 protons. d.it contains 90 protons. 2) serum […]

1) which of the following is the correct lewis dot picture of the carbon atom? a. b. c. d. 2) how many elements are there in period 2? a.2 b.6 c.8 d.18 answer: c 3) which of the following occurs […]

1) hemoglobin is an example of which of the following? a.an allosteric proteinc.both a and b b.a conjugated proteind.neither a nor b 2) the mass of a neutron is approximately which of the following? a.12 g b.1 g c.12 amu […]

1) how many bonds does a carbon atom typically form? a.2 b.4 c.6 d.8 2) what bond angle is most closely associated with a tetrahedral distribution of electron density? a.90o b.109.5o c.120o d.180o answer: b 3) which of the following […]

1) the term limelight is derived from the old name for calcium oxide. what is the formula of calcium oxide? a.cao2 b.ca2o c.cao d.ca2o2 2) what is the correct common name for the compound with the formula cucl2? a.copper chloride […]

1) which pair of species is most likely to form an ionic bond? a.two electrically neutral species b.two electrically charged species, one positive and one negative c.two negatively charged species d.two positively charged species 2) the neutron got its name […]

1) which is most likely true for an atom with six valence electrons? a.it will gain one electron. b.it will gain two electrons. c.it will lose one electron. d.it will lose two electrons. 2) which of the following occurs when […]

1) which element accounts for nearly half the mass of the earths crust? a.carbon b.iron c.oxygen d.silicon 2) which of the following give(s) the correct order of ionization energies? a.li > na > k > rb b.na < mg < […]

1) which of the following is the most abundant protein in blood plasma? a.albuminc.globulin b.fibrinogend.hemoglobin 2) a student is attempting to draw several resonance structures for a species. which of the following is allowed? a.change the connectivities of the nuclei. […]

1) consider the image given below. which of the following is the correct designation for this orbital? a.s b.px c.py d.px e.b, c or d 2) which of the following is the correct lewis dot picture of the nitrogen atom? […]

1) which greek philosopher thought that matter was infinitely divisible? a.aristotle b.democritus c.plato d.zeno 2) how many electrons are associated with a single bond? a.1 b.2 c.4 d.6 answer: b 3) which element is present in the largest amount (by […]