a neutral solution has a pH a ant O.KS4° , 1Fw/in the blanks: An acidic solution
ID: 3504856 • Letter: A
Question
a neutral solution has a pH a ant O.KS4° , 1Fw/in the blanks: An acidic solution has a pH value of , and a basic (alkaline) solution has a pH value of value of 2 Adding hydrogen ions to a solution will make the solution more aiand its pH will Aecrent a. acidic; increase b. basic; increase O acidic; decrease d. basic; decrease 3 What does a buffer do when hydrogen ions are added to a solution? a. The buffer keeps the pH of a solution neutral. b. The buffer releases base ions. C. The buffer releases additional hydrogen ions. 3) The buffer binds the hydrogen ions to remove them from the solution The buffer binds the hydrogen ions to remove them from the solution. 4 Which of the following statements about chemical reactions is false? a. The rate of a chemical reaction increases when temperature decreases. b. A chemical reaction occurs when chemical bonds are formed, broken, or rearranged. c. A chemical reaction occurs when electrons are transferred between molecules d. All of the above are true. 5 How does an enzyme affect the rate of a chemical reaction? 6 An enzyme that has lost its shape is denatured and no longer functional. b. is denatured but still functional. c. is not different from a regular enzyme as shape is not important. d. can be restored by extreme temperatures or pH swings 7 Fill in the blanks: Electrons are in an ionic bond, whereas they are in a polar covalent bond, and in a nonpolar covalent bond.Explanation / Answer
1. less than 7, equal to 7, greater than 7.
2. Option c is the correct answer.
3. Option d is the correct answer. Buffer resist the pH change by removing the hydrogen ions or hydroxyl ions added to it.
4. Option a is the correct answer. The rate of chemical reaction decreases when temperature decreases. Temperature enhance the activation energy and thus decreases the threshold value of a reaction.
5. Enzyme act as catalyst and enhance the rate of chemical reaction by lowering the activation energy of a reaction.
6. Option A is correct answer. The shape of an enzyme is important for its activity as substrate binds with the specific shape of active site of enzymes.
7. Transferred, unequally shared, equally shared
8. LiCl - ionic
Cl2 - nonpolar covalent bond
CHCl3 - polar covalent bond
C5H10O5 -polar covalent bond
KBr - ionic bond
C2H6 - nonpolar covalent bond
9. Polar, nonpolar
10. Option C is correct. Polar and ionic molecules dissolve in water while nonpolar compounds do not dissolve in water because water is highly polar and we know like dissolves like.
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