Homework Answers
On heating some substances directly change from solid state to gaseous state without the formation of liquid state. This process of conversion of solid to gas directly on heating is known as sublimation. Substances which show this property are - camphor, napthalene, etc,.
Sublimation can be used as a purification method when the substance is non volatile in nature and thus doesn't have high vapour pressure above its melting point or otherwise the substance will also come with the sublimed substance in the vapor state. If its vapor pressure is low above its melting point the amount of substance in the vapor state will be very less and thus we can get good percentage of purity.
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Sublimation can be an excellent technique for purifying a compound with which of the following specific...
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1. Which of the following describes the compound NiI2? Choose all answers that apply. The compound is ionic. The compound would conduct electricity if molten. The compound is molecular. If the compound dissolved in water it would be a strong electrolyte. The compound would be expected to have a relatively low melting point. 2. Which of the following describes the compound (NH4)2CO3? Choose all answers that apply. The compound would be expected to be a solid at room temperature and...
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Which of the following describes the compound SO2? Choose all answers that apply. A. The compound would be expected to have a relatively low melting point. B. The compound is ionic. C. If the compound dissolved in water, it would be expected to be a strong electrolyte. D. The compound would be expected to have a relatively high melting point. E. The compound is molecular.
1. Some solids can be converted directly to the vapor phase by heating. The process is...
1. Some solids can be converted directly to the vapor phase by heating. The process is called: a) Fusion b) sublimation c) vaporization d) condensation e) distillation 2. Which one of the following substances is INCORRECTLY matched with the kind of solid it forms? Substance Kind of Solid a) Sulfur dioxide molecular b) Graphite covalent c) Calcium bromide ionic d) Lithium ionic e) Methane molecular 3. Arrange the following in order of increasing melting points: KCl, He, H2O, HF. a)...
If the pressure is very low, ice can sublimate at -70 degree C, instead of melting...
If the pressure is very low, ice can sublimate at -70 degree C, instead of melting and then evaporating To calculate the enthalpy of sublimation (Delta H_subl) at such temperature, we can take advantage of the properties of state functions. a. In the T vs. H diagram below, draw a plausible path to go from H_2 O ($) at -70 degree C to H_2 O (g) at the same temperature.
Which of the following indicates the existence of strong intermolecular forces of attraction in a liquid?...
Which of the following indicates the existence of strong intermolecular forces of attraction in a liquid? a very low vapor pressure a very low viscosity a very low enthalpy of vaporization Which of the following compound has the lowest normal boiling point? Which of the following pure substances has an unstably high normal baling point? CH_3OH_3 HC1 CH_3NH_2 CH_3SH CH_3CI Which of the following substance has the weakest intermolecular forces? I_2 CaO C_3H_15 SbCl_3 SiH_4 You are given the following...
which of the following statements are true 1. sublimation and decomposition are opposite changes of state...
which of the following statements are true 1. sublimation and decomposition are opposite changes of state 2. a pressure of one atmosphere is hreater in magnitude than a pressure of 720 torr 3. the boiling point of a liquid can be increased by heating the liquid to a higher temperature a. all 3 statements are true b. 2 of the 3 statements are true c. only one of the statements is true d. none of the statements are true
Which of the following is the best explanation of nudeation? Select one: a. all of the...
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14. Which of the following exhibits dipole-dipole attraction between molecules? (EN: F = 4.0; 0 -...
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10. Answer the following by comparing two solutions: 1.50 M potassium bromide (an ionic compound) and...
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QUESTION 31 A solution was made by dissolving 26.5g of Na2CO3 in 500.0 mL of water....
QUESTION 31 A solution was made by dissolving 26.5g of Na2CO3 in 500.0 mL of water. What is the molality of this solution? (1.0g of water -1.0 ml of water) 11 Na23.6C128016 OA 0.25 m OB. 0.25 M OC 0.5M OD 0.5 m E. None of above QUESTION 32 Molarity (M) of a solution varies with O A Pressure O Temperature OC Partial pressure D. Both A and B OE. Both A and C QUESTION 33 Which of the following...
1. Some solids can be converted directly to the vapor phase by heating. The process is called: a) Fusion b) sublimation c) vaporization d) condensation e) distillation 2. Which one of the following substances is INCORRECTLY matched with the kind of solid it forms? Substance Kind of Solid a) Sulfur dioxide molecular b) Graphite covalent c) Calcium bromide ionic d) Lithium ionic e) Methane molecular 3. Arrange the following in order of increasing melting points: KCl, He, H2O, HF. a)...
If the pressure is very low, ice can sublimate at -70 degree C, instead of melting and then evaporating To calculate the enthalpy of sublimation (Delta H_subl) at such temperature, we can take advantage of the properties of state functions. a. In the T vs. H diagram below, draw a plausible path to go from H_2 O ($) at -70 degree C to H_2 O (g) at the same temperature.
Which of the following indicates the existence of strong intermolecular forces of attraction in a liquid? a very low vapor pressure a very low viscosity a very low enthalpy of vaporization Which of the following compound has the lowest normal boiling point? Which of the following pure substances has an unstably high normal baling point? CH_3OH_3 HC1 CH_3NH_2 CH_3SH CH_3CI Which of the following substance has the weakest intermolecular forces? I_2 CaO C_3H_15 SbCl_3 SiH_4 You are given the following...
Which of the following is the best explanation of nudeation? Select one: a. all of the above are true b. it can be initiated by the addition of a seed crystal to a saturated solution O c. it is the first step in the process of crystallization d. it can be initiated by providing nucleation sites - tiny crevices in a surface When the melting point of a mixture is measured, what is generally true about the results? estion Select...
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10. Answer the following by comparing two solutions: 1.50 M potassium bromide (an ionic compound) and 1.50 M sucrose (a covalent compound). a) which solution has the higher melting point? b) which solution has the higher boiling point? c) which solution has the higher vapor pressure?
QUESTION 31 A solution was made by dissolving 26.5g of Na2CO3 in 500.0 mL of water. What is the molality of this solution? (1.0g of water -1.0 ml of water) 11 Na23.6C128016 OA 0.25 m OB. 0.25 M OC 0.5M OD 0.5 m E. None of above QUESTION 32 Molarity (M) of a solution varies with O A Pressure O Temperature OC Partial pressure D. Both A and B OE. Both A and C QUESTION 33 Which of the following...
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