Colloids can be distinguished from solutions by passing a beam of light through the liquid; it...
Colloids can be distinguished from solutions by passing a beam of light through the liquid; it is visible in colloids but not in solutions. This phenomenon is known as ______.
A.dispersion
B.Brownian motion
C.the Tyndall effect
D.micelles
E.the kinetic-molecular theory
Homework Answers
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Colloids can be distinguished from solutions by passing a beam
of light through the liquid; it...
4. Light passing through a liquid-filled test tube can be scattered, absorbed, or transmitted. a. Define...
4. Light passing through a liquid-filled test tube can be scattered, absorbed, or transmitted. a. Define scattering, absorption, and transmission as they refer to light interacting with matter (the physics definition in some dictionaries). b. Which interaction(s) above will reduce the amount of light that reaches a detector?
A liquid has its temperature raised from 15°C to 65°C by passing it through a heater...
A liquid has its temperature raised from 15°C to 65°C by passing it through a heater in which the heating surface is maintained at 125°C by condensing steam. If the overall coefficient of heat transfer can be assumed to vary as the velocity raised to the power 0.8, what will be the exit temperature of the liquid if its velocity is doubled? Assume liquid thermal properties are temperature-independent over the range concerned. [ans. 60.15 C]
1. When a ray (narrow beam of light) strikes a surface we measure and angle from...
1. When a ray (narrow beam of light) strikes a surface we measure and angle from a normal (perpendicular line) at the impact point. This angle is called the angle of? 2. What is the "Law of Reflection"? 3. Rays of light entering transparent media will change their direction. This bending of light is known as? 4. When a ray of light enters a transparent media like glass, we measure an angle inside the glass from a continuation of the...
In the photoelectric effect experiment, a beam of light is shining on a metal surface and the electrons are emitted from the metal. One of the three key findings is that a minimum frequency of lig...
In the photoelectric effect experiment, a beam of light is shining on a metal surface and the electrons are emitted from the metal. One of the three key findings is that a minimum frequency of light is required for emission of electrons. This minimum frequency is found to be 5.5 × 1014 s-1 for an unknown metal. 4 Briefly describe the other two findings and draw a plot fo the KE of emitted electrons against light frequency. (a) (6 marks)...
5. .... carries the greatest amount of energy a) X-rays b) gamma rays c) visible light...
5. .... carries the greatest amount of energy a) X-rays b) gamma rays c) visible light d) infrared rays 6. The E. and B fields in electromagnetic waves are oriented a) parallel to the wave's direction of travel, as well as to each other. b) parallel to the waves direction of travel, and perpendicular to each other. c) perpendicular to the wave direction of travel, and parallel to each other. d) perpendicular to the wave's direction of travel, and also...
1. Fill out the following table by indicating which general technique (light microscopy (LM) or electron...
1. Fill out the following table by indicating which general technique (light microscopy (LM) or electron microscopy (EM]) could be used to observe each structure or phenomenon. Put "no" in the box if the technique could not be used. If light microscopy can be used, name one technique (bright-field, phase-contrast, fluorescence, etc.) that you think would be effective. You will find some useful information in Appendix 1 of this manual and Chapter 18 of your textbook. Structure or phenomenon Could...
Current Attempt in Progress support L-Serine is a nonessential amino acid, but can be a useful...
Current Attempt in Progress support L-Serine is a nonessential amino acid, but can be a useful constituent of a healthy diet and is often provided in intravenous foeding solutions for recovering patients. L-serine has a molecular weight of 105, is produced by fermentation, and is recovered and purified by crystallization at 10°C. Yield from the crystallization process is enhanced by the addition of methanol, which reduces serine solubility, An aqueous serine solution containing 30.0 wt% serine and 70.0 wt% water...
100. Flare is: (a) the widest frequency of light that can enter an objective (b) the...
100. Flare is: (a) the widest frequency of light that can enter an objective (b) the bending of light as it passes through different substances (c) wavelength/2NA (d) when the beam of light "spreads" wider than the objective's "hole" (e) wavelengths of light too short to enter the objective 101. Coccobacillus shaped bacteria are considered to be_?_ (a) cocci (b) bacilli (c) diplobacilli (d) diplococci (e)answers a and b only 102. This microscope is used for cheap and quick "'diagnosis"...
Protein molecules in solution can be separated from each other by taking advantage of their net...
Protein molecules in solution can be separated from each other by taking advantage of their net charges. In the electric field between two electrodes, a positively charged particle moves toward the negative electrode and a negatively charged particle moves toward the positive electrode. This movement, known as electrophoresis, varies with the strength of the electric field, the charge of the particle, the size and shape of the particle, and the buffer/polymer gel combination through which the protein is moving. The...
Problem 4: Read Appendix 2 below (Sec. 1.4.1 of Kasap) and then solve. A metallic back...
Problem 4: Read Appendix 2 below (Sec. 1.4.1 of Kasap) and then solve. A metallic back contact is applied to the CdTe solar cell of Problem 1 using a set up similar to that described in Figure 1.74 (b) on the next page. To form the metallic back contact, two evaporation sources are used, Cu and Au. An initial 3 nm layer of Cu is deposited first and then 30 nm of Au is deposited. After these depositions, the sample...
4. Light passing through a liquid-filled test tube can be scattered, absorbed, or transmitted. a. Define scattering, absorption, and transmission as they refer to light interacting with matter (the physics definition in some dictionaries). b. Which interaction(s) above will reduce the amount of light that reaches a detector?
1. When a ray (narrow beam of light) strikes a surface we measure and angle from a normal (perpendicular line) at the impact point. This angle is called the angle of? 2. What is the "Law of Reflection"? 3. Rays of light entering transparent media will change their direction. This bending of light is known as? 4. When a ray of light enters a transparent media like glass, we measure an angle inside the glass from a continuation of the...
In the photoelectric effect experiment, a beam of light is shining on a metal surface and the electrons are emitted from the metal. One of the three key findings is that a minimum frequency of light is required for emission of electrons. This minimum frequency is found to be 5.5 × 1014 s-1 for an unknown metal. 4 Briefly describe the other two findings and draw a plot fo the KE of emitted electrons against light frequency. (a) (6 marks)...
5. .... carries the greatest amount of energy a) X-rays b) gamma rays c) visible light d) infrared rays 6. The E. and B fields in electromagnetic waves are oriented a) parallel to the wave's direction of travel, as well as to each other. b) parallel to the waves direction of travel, and perpendicular to each other. c) perpendicular to the wave direction of travel, and parallel to each other. d) perpendicular to the wave's direction of travel, and also...
1. Fill out the following table by indicating which general technique (light microscopy (LM) or electron microscopy (EM]) could be used to observe each structure or phenomenon. Put "no" in the box if the technique could not be used. If light microscopy can be used, name one technique (bright-field, phase-contrast, fluorescence, etc.) that you think would be effective. You will find some useful information in Appendix 1 of this manual and Chapter 18 of your textbook. Structure or phenomenon Could...
Current Attempt in Progress support L-Serine is a nonessential amino acid, but can be a useful constituent of a healthy diet and is often provided in intravenous foeding solutions for recovering patients. L-serine has a molecular weight of 105, is produced by fermentation, and is recovered and purified by crystallization at 10°C. Yield from the crystallization process is enhanced by the addition of methanol, which reduces serine solubility, An aqueous serine solution containing 30.0 wt% serine and 70.0 wt% water...
Problem 4: Read Appendix 2 below (Sec. 1.4.1 of Kasap) and then solve. A metallic back contact is applied to the CdTe solar cell of Problem 1 using a set up similar to that described in Figure 1.74 (b) on the next page. To form the metallic back contact, two evaporation sources are used, Cu and Au. An initial 3 nm layer of Cu is deposited first and then 30 nm of Au is deposited. After these depositions, the sample...
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