Porosity+and+Permeability+Lab+Worksheet

Answer questions 4-5

70. This process is called sublimation process recrystallization process decolorization process

D.GUIDE QUESTIONS 4. What happen to starch as you sprinkle it on top of a glass of water? 5. How will you explain this result scientifically? 6. Will your observation be used in describing surface tension as a property of liquid? How? 7. What are the significant results in your drop test? 8. How will you explain this result scientifically? 9. Will your observation be used in describing viscosity as a property of liquid? How?

1) Using the formulas in this lab module for various shapes, calculate the volume of a solid ball made of concrete whose radius from core to outward point is 45mm. Show all work. smulov sr heqxe how lle won2 lig

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READING COMMENTARY ON CRYSTAL FORMATION: Read about a crystal of your choice and write a 4-6 paragraph essay by answering the following questions. Cite your sources. 1. How is the crystal formed? 2. Is it beneficial or harmful to man or both? Discuss how it is beneficial or harmful to man. 3. If it is something harmful, what can be done to avoid its formation? If it is something beneficial, how can its formation be promoted?

The diamond could cut/scratch the glass, this is a manifestation of what property?   a. hardness b. tensile strength c. brittleness d. flexibility

Which one is the different properties of water?  A. transports, lubricates, cushions, and excretes wastes B. cohesion, adhesion, surface tension, specific heat, and heat of vaporization

Refers to the process of breaking down of rock and minerals when exposed to atmosphere, water, acids and significant temperature fluctuations. A. sedimentation B. Mass wasting C. Erosion D. Weathering

Answer all Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation b. condensation c. precipitation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a…

Answer number 3 and 4

Surface tension measures which of the following?       a.  a liquid's resistance to flow       b.  a liquid's resistance to spreading out       c.  a liquid's ability to boil at low temperatures       d.  the molecular weight of a compound       e.  the amount of stress felt by students taking this exam

The existence of ____________ vapor can be located/achieved above its critical temperature. *   a.Saturated b.Unsaturated c. Gaseous d.Sub-cooled

Solid particles sticking together to form larger particles describes the process of   a. accretion.   b. adhesion.   c. condensation.   d. adherence.

Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…

Fill in the blanks with the appropriate word or phrase.  1. The average kinetic energy of a gas molecule depends only on its _____. 2. Above it's ____ temperature, it is imposible, under any any pressure, for a substance to exist in its liquid phase.  3. For a crystalline solid, the smallest repeating structure is referred to as the _____  ______. (Two words) 4. The scattering of light off colloidal particles is called the _____ effect.  5. A solution in which there is more dissolved solute than in a saturated solution is known as a(n) ______ solution.

B. SOLID TO GAS Place a few crystals of iodine in a dry test tube. Heat the tube and note the changes. Cool the tube. Observations: What happens when the tube is heated? What is this substance? Does any iodine melt? What is formed on cooling the tube? What is this process called? Define it. Name another substance that could undergo such a process.

Why is some water hard?

Answer number 1-8. Number 4-8 is connected to each other.

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

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

1.To allow the separation of solids from liquids with heating , the best apparatus is: Select one : a. Mortar and pestle  b . Watch glass  C. Evaporating dish d. Funnel 2.To easily heat and ignite solids , use : Select one  a. Watch glass b . Crucible with cover  C. Test tube d. Evaporating dish   3.Solid chemical reagents are generally placed inside Select one  a. Dark - colored plastic bottles  b. Plastic bottles C. Flint bottles  d. Amber bottles

Nanostructures are from the breaking up of bulk materials a. The top down approach   b. The bottom up approach   c. The bottom down approach   d. The top up approach

The strongest attractive force that occurs between compounds is _____. a. ionic attraction b. dipole-dipole attraction c. hydrogen bonding d. the London force

Answer letter a and b pls.

Which intermolecular force requires a polar molecule? A. dispersion forces  B. covalent bonding C. dipole-dipole forces D. hydrogen bonding

8. The conditions at which the rate of evaporation and condensation are equal is called? a. reactions b. equilibrium c. synthesis d. complexation

16. What is referred to as the energy (usually in kilojoules) required to vaporize 1 mole of a liquid at a given temperature? molar heat of deposition molar heat of vaporization 17. It is an attraction between unlike molecules. a. molar heat of condensation C. b. d. molar heat of sublimation Adhesion Viscosity a. C. b. Cohesion d. Surface tension 18. This positive hydrogen ends of 1 molecule are attracted to the negative end of the oxygen of another molecule called? Polar molecule Capillary action a. с. b. Non-polar molecule d. Surface tension

A material that has the ability to stretch a great deal and then return to its original dimensions is called a. Polymer b. Plastic c. Elastomer d. Monomer Give example for the answer.

If a polymer is said to be thermoplastic, this means that it     a. will not decompose at any temperature.   b. will not be brittle even at very low temperatures.   c. will become fluid repeatedly upon heating.   d. will never become fluid upon heating.   e. will become fluid only once upon heating

1. If you take some water with a straw and put a few drops on a plastic sheet. a. What is the shape of the drop? b. If you move a drop around with your straw. Does the drop change? 2. If you move one of the drops close to another with your straw. What happens when two drops meet? 3. When you put a small amount of one of the solids (salt, pepper, sugar, talcum powder) on one of the drops. Does the shape change?