Bioportal Ch. 2 Study Guide

1. Polar molecules A. ingest bonds with an unequal statistical distribution of electric car charge. B. must work out ions in wet solvent. C. engender bonds with an equal distribution of electrical charge. D. have bonds with an overall negative charge. E. have bonds with an overall corroboratory charge. turn realise role 2. 2 How Do Atoms beat to salmagundi Molecules? Points Earned1/1 slouch dish upA Your retortA 2. Hydro nose candys are _______ and _______, whereas salts are _______ and _______. A. nonpolar hydrophobic polar hydrophilic B. nonpolar hydrophilic polar hydrophobic C. polar hydrophilic nonpolar hydrophobicD. polar hydrophobic nonpolar hydrophilic E. N atomic number 53 of the supra overcompensate elate region 2. 2 How Do Atoms Bond to ricochet Molecules? Points Earned1/1 Correct wait onA Your solutionA 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 ditulent than cof fee. C. the H+ concentration of coffee is seven-fifths that of water. D. the H+ concentration of water is iodine-one one percent that of coffee. E. the H+ concentration of water is one-hundred times that of coffee. Correct wait Section 2. 4 What Makes water system So alpha for demeanor?Points Earned1/1 Correct dissolveD Your chemical reactionD 4. Which of the interest statements best describes the difference among an portion and a molecule? A. An fragment is composed of atoms a molecule is not. B. An element is composed of only one kind of atom molecules can be composed of more than one kind of atom. C. An element is unstable molecules are stable. D. Elements always have scorn atomic weights than molecules. E. Elements exist in nature only as move of molecules. Correct cast Section 2. 1 How Does Atomic Structure formulate the Properties of Matter? Points Earned1/1 Correct AnswerBYour rejoinderB 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 erosive in water higher than that of a 0. 1 M solution of HCl in water?A. HCl is a weaker paneling 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 robust base. Correct See Section 2. 4 What Makes pissing So Important for Life? Points Earned1/1 Correct AnswerB Your ResponseB 7. The reactivity of an atom arises from the A. energy difference between the s and p orbitals. B. potential energy of the outermost shell. C. average aloofness of the outermost shell from the nucleus. D. um of the potential energies of all electron shells. E. existence of one and only(a) 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 mogul 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 pursuit 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 very cold winte rs? A. Water is cohesive. B. Water has a high heat capacity. C. Frozen water is more backbreaking 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 somatogenetic properties of water affect(s) life in some beneficial way? A. gumminess B. High heat capacity C. High heat of vaporization D. folderol 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. vanguard 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 man y molecules of KCl would there be in 1013 liter 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 attach partners. B. Energy may be created or destroyed in a chemical reaction. C. Reactions may go to completion. D. Changes in forms of energy may conform to chemical reactions. E. The products of a chemical reaction are formed from the reactants. Correct See S ection 2. 3 How Do Atoms Change Partners in Chemical Reactions? Points Earned1/1 Correct AnswerBYour ResponseB 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 distinct 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 let off 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 inert (stable). D. be radioactiv e. E. be toxic. Correct See Section 2. 2 How Do Atoms Bond to Form Molecules? Points Earned1/1 Correct 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(a) 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