The following shows the beginning of the laboratory preparation of a aqueous sol
ID: 1069239 • Letter: T
Question
The following shows the beginning of the laboratory preparation of a aqueous solution of the hypothesis compound AB (150.5 g/mol). What will be the molarity of the solution when the preparation is complete? a. 51.0 M b. 0.00510 M c. 0.339 M d. 0.00339 M Which of the following is most important in determining if a material will be a solid a liquid or a gas? a. Covalent bonds b. Intermolecular forces c. Intramolecular forces d. Nuclear forces Which of the following is true of electrolytes? a. All electrolytes have water as a solvent. b. All electrolytes contain cations and anions. c. Both a and b d. Neither a nor b A catalyst speeds up a chemical reaction as a result of which of the following? a. It increases the number of collisions between reacting molecules. b. It makes the reaction more endothermic. c. It makes the reaction more exothermic. d. It provides a surface area for the reactants to meet. Many molecular collisions do not result in chemical reaction. Why is this? a. The colliding molecules are not the correct chemicals. b. The colliding molecules do not have sufficient energy. c. The colliding molecules do not have sufficient energy. d. All of the above A chemist has a sample which is known to be a solution. Which of the following might be used to separate the components of the solution? a. Chromatography b. Filtration c. Either a or b d. Neither a nor b An unknown amount of He gas occupies 30.5 L at 2.00 atm pressure and 300 K. What is the weight of the gas in the container? a. 2.48 g b. 4.95 g c. 9.91 g d. 19.8 g Which of the following is not a unit of pressure? a. cm Hg b. Torr c. pascals d. None, they are ail units of pressureExplanation / Answer
(5) the volume and mass values if you correcly use the following formula,
Molarity = (mass of solute / molar mass of solute) * (1000/ volume of solution in mL)
(6) (b)
(7) (b) All electrolytes contain cation and anion
(8) (d) It provides surface area
(9) (d) according to collision theory all the three would not result the product.
(10) (a) Since solution is homogeneous filtration is not possible to separate instead we use chromatography.
(11) (c)
P V = n R T
P V = ( m / M ) R T
m = M P V / R T
m = 4 * 2.00 * 30.5 / (0.0821 * 300)
m = 9.91 g.
(12) all