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Title: For solids and liquids, density can be expressed in which of the following units? 1. g/L 2. mg/mL 3. ... Post by: tameeka314 on Feb 25, 2018 For solids and liquids, density can be expressed in which of the following units? 1. g/L 2. mg/mL 3. g/cc 4. L/cc
a. 1 c. 2 and 4 b. 2 and 3 d. 1, 2, and 3 Q. 2 Which of the following shows the correct relationship among density, volume, and mass? 1. Density = volume/mass 2. Volume = density/mass 3. Mass = (density)/(volume) 4. Weight density = weight/volume a. 1 and 3 c. 4 b. 1 and 4 d. 3 and 4 Q. 3 What will happen to the surface tension of water droplets when a surface-active agent is added? a. Nothing will hap-pen. c. It will decrease. b. It will increase. d. It will be eliminat-ed. Q. 4 According to Laplace's law, if the surface tension of a sphere is doubled, what will happen to the pressure within the sphere? a. The pressure will decrease by one half. b. The pressure will increase by one half. c. The pressure will quadruple. d. The pressure will double. Title: For solids and liquids, density can be expressed in which of the following units? 1. g/L 2. mg/mL 3. ... Post by: cats123 on Feb 25, 2018 For solids and liquids, density = grams (g)/liter (L) or grams (g)/cubic centimeter (cm3). Using d = g/L, divide both sides by 1000. Density can also be expressed in mg/mL. Given density, d = mass (m)/volume (v), the equation can be solved for each variable: m = dv, v = m/d. When mass is substituted by weight, dw = w/v. Surface tension is the force exerted by like molecules at the liquid's surface. The introduction of a surface-active agent (e.g., soap) would decrease the cohesive forces between the water drop-lets, thus reducing their surface tension at the surface. With liquids (e.g., water), surface tension can be made to increase or decrease, but it cannot be eliminated. See Figure 1-9. Laplace's law, P = 2(ST/r), states that the pressure within a sphere is directly related to the sur-face tension of the liquid and inversely related to the radius of the sphere; that is, both surface tension and pressure within a sphere will change equally in the same proportion. Title: For solids and liquids, density can be expressed in which of the following units? 1. g/L 2. mg/mL 3. ... Post by: tameeka314 on Feb 25, 2018 Ready for finals
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