What is the purpose of formaldehyde in embalming fluid? a. it acts as a surfactant b. it acts as a preservative c. it acts as a vehicle d. it acts as a buffer

How many grams of solution will contain 30.5 g of NaCl if the solution has a concentration of 8.3 % (m/m)?    a. 3.7 g solution  b. 370 g solution  c. 250 g solution  d. 2.5 g solution  e. none of these

1. Explain, with the use of a diagram how soap molecules work to clean “dirt” particles. 2. Lactose is a sugar found in milk and other dairy products. Explain how it is broken down in most individuals. Explain lactose “intolerance”.

14. The concentration of the original unknown protein solution is determined to be 0.2173 mg/mL. What is the protein concentration in the units of parts-per-million (ppm)? One ppm = 1 mg/L. 0.217 4602 217.3 217

List 4 things to be considered when determining the type of irrigation system to use. a. b. c. d.

How do you explain the presence of contaminates in mountain water?

A. Causes more gaseous solvent to be forced into a liquid. 1. Dissolve B. Increases solubility by moving the molecules around faster. 2. Pressure C. Increases solubility by allowing the solvent to touch more sides of the solute. 3. Crushing 4. Heating D. Expands the solvent a bit to allow more room for the solute. 5. Stirring E. When something seems to disappear inside a solvent. Polar or Non-polar? Cooking oil Salt Soluble in water Ionic Compounds A compound with H's Dissolves in water Sugar Insoluble in water ive Draw a water molecule, being sure to label the ends as positive and negative. up Do metals beome positive er negalive? Would a meal be attracted to water's hydrogens or oxygen? Would a nonmetal be attracted to water's hydrogens or oxygen?

What is cloud point of a polymer or surfactant? A) Cloud point is the temperature below which the polymer / surfactant is insoluble B) Cloud point is the pH above which polymer precipitates C) Cloud point is the concentration above which polymer/surfactant precipitates D) Cloud point is the temperature above which polymer/surfactant precipitates

C2H5OH is an _________ substance and a ___________   a. organi, non, electrolyte b. organic, strong electrolyte c. strong base, strong electrolyte d. strong acid, strong electrolyte

29. The following is/are basic. A. Baking soda B. Vinegar C. Lemon juice D. Bleach E. Orange juice