Bioportal Ch. 2 Study Guide

1. Polar molecules A. accommodate bonds with an unequal distri hardlyion of electric charge. B. must(prenominal) ferment ions in weewee solution. C. have bonds with an equal distribution of electrical charge. D. have bonds with an overall negative charge. E. have bonds with an overall positive charge. remunerate hang part 2. 2 How Do Atoms Bond to take a crap Molecules? Points bring in1/1 ameliorate dissolverA Your reactionA 2. Hydrocarbons are _______ and _______, whereas salts are _______ and _______. A. unionized hydrophobic polar deliquescent B. nonpolar hydrophilic polar hydrophobic C. polar hydrophilic nonpolar hydrophobicD. polar hydrophobic nonpolar hydrophilic E. None of the above wane jut out Section 2. 2 How Do Atoms Bond to Form Molecules? Points get1/1 Correct AnswerA Your ResponseA 3. The pH of coffee is close to 5 and that of pure water is 7. This means that A. coffee is more basic than water. B. water is more acrid than coffee. C. the H+ concentratio n of coffee is seven-fifths that of water. D. the H+ concentration of water is one-one hundredth that of coffee. E. the H+ concentration of water is one-hundred times that of coffee. Correct See Section 2. 4 What Makes Water So Important for Life?Points Earned1/1 Correct AnswerD Your ResponseD 4. Which of the adjacent statements best describes the going away between an element and a molecule? A. An element is composed of atoms a molecule is not. B. An element is composed of only one kind of atom molecules fuck be composed of more than one kind of atom. C. An element is unstable molecules are stable. D. Elements always have lower atomic weights than molecules. E. Elements exist in character only as parts of molecules. Correct See Section 2. 1 How Does Atomic Structure Explain the Properties of Matter? Points Earned1/1 Correct AnswerBYour ResponseB 5. Solid salt, NaCl, is neutral. When dissolved in water, NaCl A. remains as NaCl (does not dissociate). B. dissociates to form Na and Cl+. C. dissociates to form Na+ and Cl ions that do not interact with water molecules. D. dissociates to form Na+ and Cl ions that interact with water molecules. E. does not dissociate, but interacts with water molecules. Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct AnswerD Your ResponseD 6. Why is the pH of a 0. 1 M solution of acetic acerb in water higher than that of a 0. 1 M solution of HCl in water?A. HCl is a weaker acid than acetic acid. B. The acetic acid does not fully ionize in water, but HCl does. C. HCl does not fully ionize in water, but acetic acid does. D. Acetic acid is a better buffer than HCl. E. Acetate (ionized acetic acid) is a strong base. Correct See Section 2. 4 What Makes Water So Important for Life? Points Earned1/1 Correct AnswerB Your ResponseB 7. The reactivity of an atom arises from the A. muscle difference between the s and p orbitals. B. potential energy of the outermost shell. C. average distance of the out ermost shell from the nucleus. D. um of the potential energies of all electron shells. E. being of unpaired electrons in the outermost shell. Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct AnswerE Your ResponseE 8. Covalent bond formation depends on the ability of atoms to A. share electrons with other atoms. B. donate electrons to other atoms. C. receive electrons from other atoms. D. both a and b E. All of the above Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct AnswerA Your ResponseA 9. Which of the following structures molecules is incorrect?A. CH3NH3 B. CH2=CH2 C. CH3NH2 D. CH3NH3+ E. CH3CH3 Correct See Section 2. 3 How Do Atoms Change Partners in Chemical Reactions? Points Earned1/1 Correct AnswerA Your ResponseA 10. What property of water contributes most to the ability of fish in lakes to survive precise cold winters? A. Water is cohesive. B. Water has a high heat capacity. C. Frozen water is m ore fatheaded than liquid water. D. Frozen water is less dense than liquid water. E. Water forms hydrogen bonds. Correct See Section 2. 4 What Makes Water So Important for Life? Points Earned1/1 Correct AnswerD Your ResponseD 1. Water is essential to life. Which of the following physical properties of water affect(s) life in some beneficial way? A. viscidness B. High heat capacity C. High heat of vaporization D. Ice is less dense than liquid water E. All of the above Correct See Section 2. 4 What Makes Water So Important for Life? Points Earned1/1 Correct AnswerE Your ResponseE 12. Which of the following interactions between atoms is the strongest? A. Hydrophobic B. Ionic C. Covalent D. van der Waals E. Hydrogen bonds Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1Correct AnswerC Your ResponseC 13. Given that Avagadros number is 6. 02 ? 1023, how many molecules of KCl would there be in 1013 litre of a 1 M KCl solution? A. 6. 02 ? 1036 B. 6. 02 ? 1010 C. 6. 02 ? 1010 D. 6. 02 ? 103 E. 6. 02 ? 1013 Correct See Section 2. 4 What Makes Water So Important for Life? Points Earned1/1 Correct AnswerB Your ResponseB 14. For a covalent bond to be polar, the two atoms that form the bond must have A. differing atomic weights. B. differing numbers of neutrons. C. differing melting points. D. differing electronegativities. E. similar electronegativities.Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct AnswerD Your ResponseD 15. Which of the following statements about chemical reactions is false? A. They occur when atoms combine or change their bonding partners. B. push may be created or destroyed in a chemical reaction. C. Reactions may go to completion. D. Changes in forms of energy may accompany chemical reactions. E. The products of a chemical reaction are formed from the reactants. Correct See Section 2. 3 How Do Atoms Change Partners in Chemical Reactions? Points Earned1/1 Correct AnswerBYour Respo nseB 16. Propane (CH3CH2CH3), is considered a nonpolar molecule because A. it does not contain oxygen. B. carbon and hydrogen have similar electronegativities. C. it is a gas. D. it is flammable. E. it forms hydrogen bonds. Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct AnswerB Your ResponseB 17. Isotopes of an element A. are always unstable and radioactive. B. have different numbers of protons. C. have the same atomic weight. D. have different numbers of neutrons. E. have different numbers of electrons. Correct See Section 2. How Does Atomic Structure Explain the Properties of Matter? Points Earned1/1 Correct AnswerD Your ResponseD 18. An element that contains ten protons and ten electrons is likely to A. form covalent bonds with another element. B. form ionic bonds with another element. C. be chemically electroneutral (stable). D. be radioactive. E. be toxic. Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Co rrect AnswerC Your ResponseC 19. Rank the elements carbon (C), hydrogen (H), oxygen (O), and phosphorus (P) in decreasing order of the number of covalent bonds they usually form.A. C P N O H B. P O C N H C. P C N O H D. P C O N H E. P C O H N Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct AnswerC Your ResponseC 20. The molecular weight of acetic acid is 60. How many grams of acetic acid would be required to prepare 10 ml of a 0. 001 M (1. 0 mM) solution? A. 6. 0 B. 0. 6 C. 0. 0006 D. 0. 06 E. 0. 006 Correct See Section 2. 4 What Makes Water So Important for Life? Points Earned1/1 Correct AnswerC Your ResponseC