Pounding is a usual technique used in sample preparation. What is the chemical basis why pounding is used in sample preparation? O Pounding allows molecules to be prepared for reaction Pounding breaks the intermolecular forces within molecules Pounding increases surface area leading to faster reaction Pounding allows samples to fit in test tube

Examples of solid gas mixtures

The DIAGRAM below contains FIVE PURE SUBSTANCES with the molecular componentshown per substance.  Using this DIAGRAM answer the questions. 1. Which substance CANNOT decolorize bromine water? Substance ASubstance BSubstance CSubstance D  2. Which substance is expected to turn blue litmus paper into red color? Substance ASubstance BSubstance CSubstance D 3. Which substance has the greatest tendency to participate in a chemicalreaction with small chain alcohol in an acidified chemical environment?  Substance ASubstance BSubstance DSubstance E  4. Which substance has the highest solubility to hexadecane? Substance ASubstance CSubstance DSubstance E 5. Which substances can react with potassium borohydride, converting theproduct into alkene alcohol (assuming complete reaction)?  Substance A and BSubstance B and DSubstance C and DSubstance D and E 6. Aside from London dispersion forces, which substance do you expect dipoleinteractions to be effective? Substance A and BSubstance B and…

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…

Need these two!!

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

Reagent Table Crop Reagent Amount Molecular Weight (g/mol) Molar millimoles equivalents Salcylamide 2g 137.1mg/mol 1.0 14.6mol ethanol 2.52g 149.9mg/mol 1.15 16.79mol Sodium Hypochlorite 22.88ml 74.44mg/mol 1.2 17.52mol 95% Ethanol 40ml solvent calculate theoretical yield using the chart, show calculations melting point 226celius, mass of the product 4.340 what is the percent of this?

By placing a bottle of hydrochloric acid next to another of ammonia and removing the corks from both, we note the formation of intense white smoke, consisting of ammonium chloride (HCl + NH3→ NH4Cl).  This experience is an example of:   a. decomposition     b. combination     c. sublimation     d. double replacement     e. single replacement

Concentration (mol L-¹) COCI₂(g) Cl₂(g) + CO(g) AH=+108 kJ 0.14- 0.12- 0.10- 0.08- 0.06 0.04 0.02- 0.00- 0 2 4 -Cl₂ 6 CO COCI₂ 8 10 12 14 Time (min) a. The stress that occurred at 4 seconds was an: a. increase in temperature b. decrease in temperature c. increase in volume d. decrease in volume e. increase in the concentration of CO f. decrease in the concentration of CO b. The stress that occurred at 10 seconds was a(n): a. increase in temperature b. decrease in temperature c. increase in volume d. decrease in volume e. increase in the concentration of CO f. decrease in the concentration of CO 16 The stress that occurred at 14 seconds was a(n): a. increase in temperature b. decrease in temperature c. increase in volume d. decrease in volume e. increase in the concentration of CO f. decrease in the concentration of CO 18

6. Describe the differences between flocculated and deflocculated suspensions. 7. What is the purpose of a wetting agent in a suspension dosage form?