1107-SP-Whitt-A

Mary are trying to increase the rate at which she can dissolve a large amount of sodium chloride into water to make a solution to use in lab. Which of the following would be the BEST method of doing this?     A heat the water and use small pieces of sodium chloride     B heat the water and use a large piece of sodium chloride     C stir and heat the mixture and use small pieces of sodium chloride     D stir and heat the mixture and use a large piece of sodium chloride

How does a solution become supersaturated?   Dissolve lots of solvent in it.   Dissolve a little solute in it.   Dissolve more solute than normal while heating the solution.   Dissolve less solute than normal while cooling the solution.

You need to analyze an aqueous alcohol solution in the laboratory. You separated 367 mL of this solution and diluted with 40 mL of water. You then get 50 mL of the resulting solution and mixed with 50 mL 30% v/v aqueous alcohol solution. You analyzed the final solution and found out that it's concentration is 40% v/v alcohol. How much alcohol in mL does the initial solution contains?"

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Rank these substances in order of increasing solubility in water. Solubility Substances (4 items) (Drag and drop into the appropriate area) Most soluble CH3CH2CH2OH 1 CH3(CH2)5OH CH3(CH2)3OH 2 CH3CH2OH 3. 4 Least soluble

Q1/Why do we use oil instead of water to determine the melting point of chemicals? Q2/What is the reason for the variation in the measured melting point of the same chemical? Q3/What is the best type of oil used to measure the melting point of chemicals? Why?

A mixture of copper and tin, commonly called bronze is a homogeneous mixture or a ____________ solution.

2 things about water treatment (NOT WASTEWATER)

Hello can you please help me answer this?

How do I calculate question 1 part b (in the picture)? I don’t even know where to start.    Thank you!

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story Bookmarks Window Help > ab and Mastering OCT 19 80 You may want to reference (Pages 294- A ▼ $ Part A Submit increases How do temperature and pressure affect the solubility of solids and gases in water? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. decreases has no effect on Section 9.3 while completing this problem. Previous Answers Request Answer % openvellum.ecollege.com FS E Course Home An increase temperature usually increases the solubility of solids and decreases the solubility of gases in water. S An increase in pressure of a gas above a liquid increes the solubility of a gas within that solution and decreases the solubility of solids. F6 X Incorrect; Try Again; 5 attempts remaining You filled in 1 of 4 blanks incorrectly. Henry's law states that the solubility of a gas in a liquid is directly related to the gas pressure above the liquid. The law does not apply to solids, as the pressure does not impact the number of solid…

2. Questions: 1. CHM-202 Lab 2 Freezing Point Depression Rev2 G6-2022 10/14 From your understanding of colligative properties, how would you design an experiment to measure the freezing point of a material which freezes at -2 °C using the same apparatus used in this laboratory and any chemical reagents commonly found in a chemical laboratory. Ice is the only material you have available to cool the solutions. If you measured the boiling point of the solution used in Trial 4, would you predict it would have a boiling point equal to, higher than, or lower than the boiling point of pure cyclohexane? Explain your answer.

A student observes crystals at the bottom of a flask that contains a solution of LiBr in water. Which of the following is the best way to determine whether the solution is saturated? heat the flask add more water stir the solution filter the crystals

Good afternoon. Please help with number 6 and 7

LIGHT SOURCE A C Match each type of mixture to its correct letter. Suspension [ Choose ] Solution [ Choose ] Colloid [Choose]

Professor X mixed two solutions in a test tube and observed that the mixture was warm. He also tried to mix 50-ml each of the solutions in a 100-ml volumetric flask and found out that the total volume was less than 100 ml. He only has water, methanol, ethanol, and acetone in his table. From the following choices, what solutions did Professor X mix?   a.acetone and water b.water and methanol c.acetone and ethanol d.methanol and ethanol

What mass of ethylene glycol (MW. = 62.1 g/mol) antifreeze must be added to 10.0 liters of water to produce a solution that freezes at -23.3 C degrees. Density of water is lg/ml and Kf = -1.86° C/m. a. 7.8 kg b. 8.4 g c. 6.8 kg d. 5.3 kg

A student wants to determine how different factors affect the rate of dissolving a solid in water. Trial Size of Particles Rate of Dissolving 1 small 10 sec medium 20 sec 3 large 30 sec What procedures can be performed on trials 2 and 3 so that the rate of dissolving is the same as trail 1? The student can decrease the temperature The student can decrease the pressure The student can increase the pressure The student can increase the temperature

Solubility (g in 100g water) 100 80 60 40 20 0 10 20 30 40 50 Temperature (°C) 60 70 Creative Commons license. Wikipedia. https://commons.wikimedia.org/wiki/File:Solubility_curve.jpg B A 80 D In 700. g of water at 50 degrees Celsius, approximately what mass of substance C will dissolve? Round your answer to a whole number. Answer: g of "C".

Q9. Using this figure, discuss the effect of temperature, pressure, and high altitude on the solubility of oxygen in water. 15 2,000 m 14 (6.600 ft) 13 12 Sea level 10 About 9 ppm at sea level and 20°C 7 About 6 ppm at 2,000 m and 30°C 40 10 20 30 Temperature (°C) Oxygen solubility (ppm)

15. 500g of AbSa is dissolved in H20 to make 15L of solution. What is its normality? (MW: Al-27g/mol, S-32g/mol, H=lg/mol, 0=16g/mol) A. 0.11 N B. 0.07 N C. 0.22 N D. 0.04 N 16. The concentration of a 1500mL aqueous KCI solution was increased from 25.0 M to 80.0 M by evaporation. How much H20 was removed? (MW: K=39g/mol, Cl=35g/mol, H=1g/mol, 0-16g/mol) A. 1.03 L B. 0.47 L C. 1968.75 mL D. 4.68.75 mL 17. Suppose that 15M of NaCI solution with a volume of 15L is heated and loses 2000ml of its water content What would be the final concentration of your NaCl sample? (MW: Na-23g/mol, Cl=35g/mol, H=lg/mol, 0=16g/mol) A. 3.75 M B. 0.0375 M С. 37.5 M D. 375.0 M 18. How much ml of ethanol is needed to make 2000ml of an aqueous 15% (v/v) solution? A. 3000 mL В. 300 mL C. 30 mL D. None of the above 19. What mass of HCl is needed to make 3000g of 3% solution? (MW: H=lg/mol, Cl=35g/mol) A. 0.09 gram B. 90 grams C 0.1 gram D. 10 grams

Directions: Analyze each of the following statements whether it describes the property of water. Write TRUE if the statement is correct but if it Is False, change the underlined word or group of words to make the whole statement true. Write your answers on the space provided. 7. The bond that holds each water molecule with the adjacent water molecule is a hydrogen bond. 8. Substances that are polar and ready to be dissolved in water are called hydrophobic. 9. The type of intermolecular force which is a polar covalent bond makes the water polar and explains why water is a universal solvent. 10. High surface tension is the property of water that allows the lucky fishes to. stay on lakes where the water takes a lot of heat before it gets hot.

The binary compound M2X has a solubility of 7.4 × 10−7 mol/L and a molar mass, ℳ = 160.53 g/mol. Calculate the Ksp for this compound. Report your answer to TWO significant figures. Enter your answer in scientific notation using the appropriate boxes. Remember, a number like 1.6, in scientific notation is 1.6 × 100.