Most Wanted Questions
Which of the processes is exothermic? 1.evaporation of alcohol 2.sublimation of iodine 3.solidification of volcanic lava 4. burning of paper
A certain weak acid, ha, has a ka value of 7.1×10−7. part a calculate the percent ionization of ha in a 0.10 m solution.
Which equation could be used to calculate the sum of the geometric series? 1/3 + 2/9 + 4/27 + 8/81 + 16/243?
Which Cold War event happened last? A.The Korean War ends. B.Sputnik is launched. C.The Vietnam War ends. D.The Cuban Missile Crisis takes place.
Which statement best describes the use of a chemical indicator in a titration? a. a measure of the quantity of acid dissolved in water designated by molarity b. an intrinsic characteristic of a particular acid, not related to concentration c. the amount of hydrogen ions present in the acid d. the amount of hydroxide ions present in a solution
Which of the following best describes ionic bonding? A. the attraction of ions due to the transfer of valence electrons B. the sharing of valence electrons between two or more neutral atoms C. the repulsion of ions due to the transfer of valence electrons D. the transfer of valence electrons between atoms to make them neutral
#PLATOFAM Which is the rigid molecule composing plant cell walls? A.) starch B.) glycogen C.) hemoglobin D.) cellulose