Lab 4 PHY105M (1)

Ceramics used as abrasives must be hard and tough and be able to withstand high temperatures that arise from frictional forces. What is the minimum required hardness (measure in Mohs scale) for a material to be used as abrasive? Your answer

In your own words, describe why metals are such good conductors of electricity. Be sure to include the definition of metallic bond in your answer. Answer in 2 to 3 complete sentences. I !!! H Normal A Enter your answer here BIUS √x 20 Tx

Which statement about bulk properties of matter and the electrostatic forces between molecules is correct? The bulk properties of a material determine the strength of the electrostatic forces between molecules. Bulk properties can be changed to strengthen or weaken the electrostatic forces between molecules in a material. The bulk properties of a material can be inferred by measuring the strength of the electrostatic forces between molecules. Bulk properties can be used to compare the strength of electrostatic forces between molecules in different materials.

Recently a team from Clarkson University discovered a porous solid called NU-1000, constructed from Zr, C, O, and H, excels at removing poly- and perfluoroalkyl species (aka PFAS) from water. The density of this material is 0.486 g/cm³ and its surface area is 2255 m²/g. If 50.0 g of this material is placed in water, calculate the total area (in cm²) of this sample. DONT GIVE ANY TYPE OF IMAGE IN ANSWER OTHERWISE I WILL GIVE INCORRECT ANSWER DON'T GIVE HANDWRITTEN SOLUTION

Which of the following is true about strain? A It is the ability of the material to absorb force until fracture B It is dimensionless and is the ability of the material to absorb force until fracture It is dimensionless It can be evaluated as the force applied per area

4. An alloy has an elastic modulus of 115 GPa. For the alloy, plastic deformation begins at a stress of 275 MPa. (a) If a sample of cross-sectional area 325 mm? is obtained from the alloy, determine the maximum load that may be applied on the sample without plastic deformation. (b) The original sample length is specified as 115 mm, what is the maximum length to which the sample can be stretched without plastic deformation.

2. Suggest how a thixotropic solution that is 96% water might be used in fighting fires. Would it flow easily from a hose? What would happen after it landed on a surface? How would these physical properties enable it to suppress a fire?

Which of the following methods is used to determine "dissolved metals" in a water sample? O Digest the water sample and measure the metals in the digest Filter the water sample and measure the metals in the filtrate Filter the water sample and measure the metals in the particles in the filter Digest the water sample, filter the digest, then measure the metals in the filtrate

is the study of fundamental principles of nanostructures between bulk and atomic properties.

Which materials are best suited for discharging excess static charge on your clothing during winter, Conductors or insulators?

Sublimation is preferred over recrystallization when you work with an amount of solid material to be purified that weighs: A) at least 1 kg B) about 100 mg C) about 1 mol D) about 1000 ml A OD

4. The Marangoni effect is the tendency of a material to move from a region of low surface tension to a region of high surface tension. Using your chemical knowledge, explain how the surfactant changed surface tension to propel your boat forward. Because we added soap to the bottom of our clip, the surface tension was low in that area only, causing it to move to another spot because...

The masses of benzene and an unknown liquid droplets falling off from the same stalagmometer at 20 ° C were measured as 0.052 g and 0.042 g, respectively. Since the surface tension of benzene at the test temperature is 28.9 dyn / cm, find the surface tension of the other liquid at the same temperature.

5. Which tablet size and the liquid combination resulted in the fastest dissolution times? A. crushed, room temperature water B. crushed, hot water C. crushed, room temperature vinegar D. broken, hot water E. broken, room temperature vinegar 6. What is the relationship between particle size and the time it takes for the tablet to dissolve? A. direct proportion B. inverse proportion C. combined proportion D. joint proportion 7. Using the activity as a model, how does mechanical weathering (breaking or crushing) contribute to chemical weathering (dissolution)? A. Increases size of particles B. Decreases dissolution time C. Increases surface area D. Both A and B E. Both B and C

What is formed when gas is enclosed in a chamber then liquified under very high pressure? * What latent heat value signifies the lost of heat during a phase change? What is the unique temperature and pressure at which the three phases of a substance are in equilibrium with each other? * Which liquid crystal is of pharmaceutical significance? *

The time for water to flow through an Ostwald pipet at 20°C was 298.8 seconds. The density of water at 20°C is 0.9982 and the density of a sample of olive oil is 0.910 g/cm3. The viscosity of water at 20°C is 1.002 cp and the viscosity of the olive oil is 84 cp. How long will it take for the olive oil to flow through the same pipet at 20°C?

Which method would you use to determine water content in packaging material, pharmaceuticals and cosmetics?  Mention few advantages of this method.

So here are a series of experiments:1. A balloon was held against a wall. When it was released, the balloon fell to the floor. 2. A balloon was rubbed with a piece of wool and again held against a wall. This time, whenthe balloon was released it stuck to the wall. 3.  A  hole was poked in the bottom of a plastic cup. The cup was filled with water, and thewater was allowed to drain out through the hole in the bottom of the cup. While the water wasrunning out the bottom of the cup, a balloon was held near the stream of water. The watercontinued to fall straight down. 4. The previous demonstration was repeated, except this time the balloon was rubbed withwool before it was held near the stream of water. This time, the stream of water was drawntoward the balloon instead of falling straight down. Please explain all of the above. Also please show that you have a really good understanding ofthe laws of electrostatics and the structure of atoms as you do so, and use each of the following terms…

3. You found a weird ceramic material on the street and wonders if it might be ok to use in a medical device. What technique can you use to figure out the chemical composition of the surface? What can you use to see what the surface looks like?

Determine what is being asked in each item.   What specific type of intermolecular force causes the increase of boiling point in alcohol molecules? What reduces the intermolecular attraction in hydrocarbons resulting to a decrease of boiling? What is the measurement for the average kinetic energy of particles? What substance is found to be liquid under pressured conditions but is gaseous in normal atmospheric pressure? What is formed when gas is enclosed in a chamber then liquified under very high pressure? * What is the vertical distance from mean sea level to the site being measured that affects boiling point? What is the process of vaporization called? What latent heat value signifies the lost of heat during a phase change? What is the property of molecules and materials of having identical physical properties in all directions? What is the ability of a solid substance to crystallize into more than one different crystal structure? What is the unique temperature and pressure at which…