# Substance A has a melting point of -10 degree celcius and a boiling point of 57 degree celcius. Sunstance B has a melting point of -67 degree celius and a boiling point of 15 degree celius. Room temperature is 20

32,872 results

1. ### Chemistry

Substance A has a melting point of -10 degree celcius and a boiling point of 57 degree celcius. Sunstance B has a melting point of -67 degree celius and a boiling point of 15 degree celius. Room temperature is 20 degree celcius. (A) What is the physical state of substance A at...
2. ### Chemistry

How much heat is required to vaporize 1.00 L of CCl4 at its normal boiling point? The following data are given for CCl4. Normal melting point, -23 degree celcius , normal boiling point, 77 degree celcius density of liquid 1.59 g/mL; ; enthalpy of fusion 3.28 kJ/mol vapor ...
3. ### Physics

A faulty celcius thermometer read 0.7 degree celcius at the melting point of pure ice and 99.5 at the boiling point of water at normal pressure. Calculate the correct temperature when it reads 30 degree celcius. At what temperature will its reading be exactly correct
4. ### Chemistry

The boiling point of alcohol is 78.3 degrees Celcius at 760 mm atm pressure. Would the boiling point be higher or lower than 78.3 degree Celcius at hugher altirudes? Why?
5. ### chemistry

Say you have two substances, A and B. A has a melting point of 300 degrees Celcius, while B has a melting point of 200 degrees Celcius. If you took a mixed melting point where the ratio of A is higher than B, what would the melting range look like? Would the melting point be ...
6. ### Physics

The ice point of a faulty mercury in glass thermometer isX degree celcius while its steam point is 85 degree celcius. If the thermometer reads 50 degree celcius when the true temperature is 40 degree celcius, calculate the value of X
7. ### Science

A substance has melting point of 0 Celius and a boiling point of 100 Celius. The substance is most likely * water * hydrogen * gold * table salt
8. ### science

which substance has a melting point of -219 degree celsius and boiling point of -183 celsius at room temperature 30 degree celsius
9. ### Chemistry

1) how many joules are required for each of the following? A)Heating 55g of water from 12 degree Celsius to 76 degree Celsius B) Melting 12.8g of ice at 0 degree Celsius. c) Boiling 21.1 g of water at 100 degree Celcius
10. ### Chemistry

I have a couple of questions I need a hand with: 1. Oxygen has a melting point of -218 degrees celcius and a boiling point of -183 degrees celcius. This means that oxygen would be a liquid at...? Please do not tell me the answer, but tell me the relation between the melting ...
11. ### Science chemistry

Which compound has the melting point of -23 degree Celsius and boiling point of 77 degree Celsius ? Thx....
12. ### brilient school

the melting point of mercury is -39 degree C .the freezing point of alcohol is -98 degree C .how much more is the melting point
13. ### chemistry

3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown
14. ### chemistry

-182 degree c, -68 degree c, 943 degree c, 115 degree c, 0 degree c, which is the melting point of an ionic solid?
15. ### Math

Matter is in a liquid state when its temperature is between its melting point and its boiling point. Suppose that some substance has a melting point of negative 46.81 degrees and a boiling point of 357.63 degrees . What is the range of temperatures in degrees Fahrenheit for ...
16. ### Chemistry

Question: if you added ethylene glycol to your car's radiator to lower the freezing point to -31.0 degree C, what would the corresponding boiling point of the coolant in your radiator. The freezing point and boiling point constants for water are 1.86 and .510 degree C/m The ...
17. ### College Chem

The boiling point of water at 756 mm Hg is 99.85 degree C. What mass percent of surcrose (C12H22O11) should be present to raise the boiling point to 100.00 degree C at this pressure?
18. ### Chemistry

Which of the following statements about boiling points are false: A. the boiling point of 0.1 m KF(aq) is lower than the boiling point of 0.1 m ethanol(aq) B. the boiling point of a 0.5 m aqueous solution of NaOH is the same as the boiling point of a 0.5 m aqueous solution of ...
19. ### science

when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183C degree and the other has a boiling point of -253C degree. Has a physical or chemical change occurred?
20. ### Science HELP please!!!

when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183C degree and the other has a boiling point of -253C degree. Has a physical or chemical change occurred? Explain?
21. ### Chemistry

The specific heat capacity of a metal is given as 0.745 J/ degree Celcius.What mass of the metal must be heated to 95 degree Celcius in order to be used to warm 2.548 L of water from 18.1 degree Celcius to 22.5 degree Celcius ? I'm so confused I don't even know where to start ...
22. ### math

metal mercury at room temperature is a liquid. melting point is 39 degree celsius.freezing point of alcohol is 114 degree celsius.how mu7ch warmer is the melting point of mercury than the freezing point of alcohol
23. ### college physics

calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.
24. ### college physics

calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.
25. ### chem

1.) When determining the melting point it's described in my text as recording 2 points in the melting process. a) when the first drop of liquid is seen b) when all of the compound is liquified and since I have to determine the melting point of sulfanilamide pure and impure (I ...
26. ### Chemistry

The melting point of aspirin : 128-137Celsius degree. The melting point of the crude aspirin was measured to be 128 Celsius degree. What does it indicate about the purity of the product?
27. ### chemistry

Hydrogen fluoride has a boiling point of 19 degree Celsius whereas water has a boiling point of 100 degree Celsius...... Explain
28. ### science

How much heat is required to warm 225g of ice from -46.8 degree celcius to 0.0 degree celcius, melt the ice, warm the water from 0.0 degree celcius to 100.0 degree celcius, boil water, and heat the steam to 173.0 degree celcius.
29. ### Science

Study the data table below. A three-column table presenting the 'Melting Point and Boiling Point for Common Substances.' The column headers are 'Substance,' 'Melting point (°C),' and 'Boiling point (°C).' For substance aluminum, the values are '660' and '2519,' respectively...
30. ### Chemistry

Why is it that Hydrogen fluoride has a boiling point of 19 degree celsius, whereas water has a boiling point of 100 degree celsius.
31. ### Organic chemistry plz help me out (thanks)

1) a) What is the normail boiling point (760 mm Hg) for a compound that boils at 150 degree celsius at 10 mm Hg pressure? b) At which temperature would the compund in (a) boil if the pressure were 40 mm Hg? c) A compound was distilled at atmospheric pressure and had a boiling ...
32. ### chemistry

what is the boiling point that contains 3.15 moles of ethylene C2H6O2 and 250.0g of H2O? answer should end in degree's celcius a) 1.03 C b) 93.55 C c) 106.45 C d) 6.45 C e) 103.44 C
33. ### Chemistry Q1,3,5

1) What would be the preferred heating device (s) in each of the following situations? a) reflux a solvent with a 56 degree Celsius boiling point b) reflux a solvent with a 110 degree Celsius boiling point c) distillation of a substance that boils at 220 degree Celsius 3) What...
34. ### heat

At what point will liquid alcohol change to vapor? Boiling Melting Fusing Freezing The boiling point is the point above which the liquid state does not exist. Evaporation can occur from the liquid state at lower temperatures as well, but there will be no "boiling" (rapid ...
35. ### Chemistry Plz Help

Calculate the correct boiling point for nitrobenzene. Assume that a total immersion thermometer was used. The obs. boiling point was 205 degree celsius. The reflux ring in the test tube just reached up to the 0 degree celsius mark on the thermometer. A second thermometer ...
36. ### science, temperature, thermometer

the thread of mercury in a thermometer is 17cm when placed above boiling water, and 9cm when dipped in melting ice. how long would the thread of mercury become if placed in a liquid with a temperature of 75 degree celsius. is there a method or formula for this? Yes there is a ...
37. ### Science

An alumium rod when measured with a steel scale both being at 25 degree celcius appears to be 1 meter long. If the scale is correct at 0 degree celcius, what is the true length of the rod at 25 degree celcius? What wull be the length of rod at 0 degree celcius?
38. ### Heat Energy

1. (a) 500g of copper is heated from 30 degree celcius - 120 degree celcius?. (b) if the same quantity of heat is supplied to 300g of water initial at 30 degree celcius,what will be the final temperature.
39. ### Physics

A closed inexpansible vessel contains air saturated with water vapour at 77 degree Celcius. The total pressure of the vessel is 1007mmHg. Calculate the new pressure if the temperature is reduced to 27 degree celcius. (svp water at 77 degree celcius and 27 degree celcius ...
40. ### Physics

Calculate amount of energy needed to completely vaporize a 50g piece of 20 degree C silver melting point 1064 C L(f) = 64KJ/Kg Boiling point 2856C L(v) = 1645 KJ/Kg c= 0.13KJ/Kg degrees C I'm thinking I balance each side to equal each other but I'm not dure-I've done specific ...
41. ### physics

A substance has a melting point of 800ºC and a boiling point of 1465ºC. The substance is most likely A. water. B. hydrogen. C. gold. D. table salt. D?
42. ### Chemistry

Could you help me with this question: A molecule of chloroform, CHCl3, has the same shape as a molecule of methane CH4. However, methane's boiling point is -164 degrees celcius ans chloroform's boiling point is 62 degrees celcius. Explain the difference between the two boiling...
43. ### college chemistry

Comparing the boiling points of: A) C3H8 B) C5H12 C) C2H5OH and identify the folowing statements as either True or False: Dispersion forces only for (A) Boiling point (C) > Boiling point (A) (B) exhibits hydrogen bonding Boiling point (C) < Boiling point (A) (A) exhibits...
44. ### science

in shell and tube type of condenser, the flue gas mixture of acetaldehyde,oxygen and nitrogen at 17391.17Kg/hr enters to the condenser at 75 degree celcius and leaves at 20 degree celcius,while the cooling water enters at 17 degree celcius and leaves at 37 degree celcius....
45. ### chemistry

Which of the following statements about boiling points are true? A. The boiling point of 0.1 m NaF(aq) is lower than the boiling point of 0.1 m methanol(aq). B. The boiling point of a 0.5 m aqueous solution of LiOH is the same as the boiling point of a 0.5 m aqueous solution ...
46. ### Sublimes?

Question: An unknown compound gave a melting point of 230C. When the molten liquid solidified, the melting point was redetermined and found to be 131C. Give a possible explanation for this discrepancy. My answer: The compound sublimed. How would sublimation work to do this? ...
47. ### science

why can a scientist use boiling point or melting point to identify an unknow substance?
48. ### Chemistry

The normal boiling point of benzene is 80 degree C and its heat of vaporizations is 30.8 kj/mol. What is its boiling point at the top of Pikes Peak where P=260 mmHg?
49. ### chemistry

the boiling point of water at 735mmHg is 99.073 degrees celcius. What mass of NaCl should be added to 3.11kg water to increase the boiling point to 100.000 degrees celcius? Kb for water = 0.510 K Kg mol-1
50. ### chemistry

What is the energy released when steam at 25 g of steam at 10 degree celcius is cooled to ice at-10 degree celcius work heat change for the following changes calculated 150 degree Celsius steam --150 degree water 150 degree water to 0 degree water 100 degreewater-- 0 degree ...
51. ### chemistry

125 mL of 25 dergree celsius of distilled water was used to wash and transfer a precipitate. rather than 20 ml of CHILLED distilled water (at 4 degree celcius). the solubility of baruim iodate monohydrate in 25 degree celcius water is 0.028g per 100 ml of water; in 4 degree ...
52. ### Chemistry

What can be said about a substance with a triple point above 1atm 1) The liquid state of the substance cannot exist. 2) The gaseous state at 1 atm pressure cannot be condensed to the solid at the triple point temperature. 3) The melting point of the solid must be greater than ...
53. ### Chem

The melting point of KCl is 776 C whereas the melting point of NaCl is 801 C. 1. Identify the type of bonding in each substance. A: Both NaCl and KCl are ionic. 2. Account for the differences in the boiling points of the substances using principles of atomic structure, bonding...
54. ### chemistry

a)Rank the following 3 tetrachloride compounds in terms of increasing boiling point: carbon tetrachloride (CCl4), methane (CH4), dichloromethane (CH2Cl2) b) Which molecule ( KI or LiF ) has the higher boiling point? c)Select the single most important reason below to justify ...
55. ### Calculus

The equation for converting Farenheit to Celcius is F=9/5C + 32. What is the meaning of the slope of this line? A. For every 9 degree increase in Celcius, there's a 5 degree increase in Farenheit. B. For every 5 degree increase in C, there's a 9 degree increase in F. C. For ...
56. ### Physics

120 grams of metal at 88 degree celcius is poured into a 70 grams isolated cup contains 250 grams of water at 16 degree celcius. The final temperature of the mixture is 17.5 degree celcius. Determine the specific heat capacity of the metal?
57. ### Chemistry

Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 degrees celcius ? The freezing point for pure water is 0.0 degrees celcius and Kf is equal to 1.86 degrees celcius/m. If the 3.90 m...
58. ### Chemistry

Which of the following is NOT true? (A) CH2O Has a relatively high boiling point due to hydrogen bonding. (b) BaCl2 is an example of an ionic sold. (c) Ionic solids are poor conductors of heat and electicity. (d) The melting point of Fe is higher than glucose. (e) The melting ...
59. ### Chemistry(Please check)

1) Where in the phase diagram of a compound do all phases exist together? a) at the sublimation point b) at the boiling point c) at the melting point d) at the critical point e) at the triple point I chose answer E, the triple point. Is this correct?
60. ### Chemistry

I'm really confused on this question so if someone could show the steps and how to get the answer, that would be great. I understand that you would use delta T=Kbm, but don't know how to use the equation to find the answer. Thanks!! Calculate the boiling point of a solution ...
61. ### math

five forces are acting on a point p they are 60N at 90 degree, 40N at o degree, 80 N at 270 degree, 40N at 180 degree , ad 5o N at 60 degree what is the madnitude and direction of the vectors that would produce equilibrium at point p?
62. ### science

liquid alcohol will change to vapor when its temperature reaches the A. boiling point B. fusing point C. freezing point D. melting point
63. ### chemistry

Thanks much! Are melting point and boiling point examples of macroscopic properties? What exactly are macroscopic properties? Yes, mp and bp are macroscopic. One can see melting and boiling. macroscopic: large enough to be visible to the naked eye
64. ### Math

If a metal bar at a temperature of 20 degree celcius is dropped in boiling water how long will it take for the bar to reach 98 celcius at a rate of 2 degrees per second
65. ### ORG CHEM LAB

Im doing a conclusion on a lab of acetaminophen. We were to take a melting point of the crude smale of acetaminophen and melting point of the crystallized acetaminophen. The mp for crude sample: 169.2 degree C The mp for crystallized sample: 172. degree C Why the change in mp'...
66. ### chemistry

Which of the following properties increase with increasing atomic number for fluorine and chlorine? I. melting point of the elements (yes) II. boiling point of the hydrogen halides i'm not sure about II because HF has the highest boiling point but fluorine and chloride fit in ...
67. ### chemistry

Which of the following properties increase with increasing atomic number for fluorine and chlorine? I. melting point of the elements (yes) II. boiling point of the hydrogen halides i'm not sure about II because HF has the highest boiling point but fluorine and chloride fit in ...
68. ### Chemistry

Can someone pls help me!! You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute ...
69. ### geometry

The melting point of mercury is -36 degrees fahrenheit and its boiling point is 672 degrees fahrenheit what is the difference between the boiling points and the melting points
70. ### Chemistry

You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute zero in A ?
71. ### chemistry

Rank the size of a change in temperature of one degree fahrenheit, one degree celsius, and one kelvin. Ok I can't seem to get this question right no matter what I do. Isn't one fahrenheit degree the largest then celsius and kelvin? There are 180 fahrenheit degrees between the ...
72. ### math

The temperatures in degree celcius at midnight on 10 consecutive days were 4,1,3,0,-2,-1,-5,-3,1,-2. How many of these temperatures are within 2.2 degree celcius of 1 degree celcius?
73. ### math word problem

the boiling point of water 212 degree f. this is 180 degree more than its freezing point. define the variable. then write and solve an equation to find the frezzing point of water. show your work. the variable would be: d could be the variable. f + 180 = 212 degree f+180 -180...
74. ### physics

9. 2 kg of water is contained in a 2.5 KW electric kittle. Assuring that the heat capacity of the kettle is negligible. Calculate (i) the time taken for the temp of water to rise from 25 degree centigrade to it boiling point 100 degree centigrade. (ii) the mass of the water ...
75. ### physics

2 kg of water is contained in a 2.5 KW electric kittle. Assuring that the heat capacity of the kettle is negligible. Calculate (i) the time taken for the temp of water to rise from 25 degree centigrade to it boiling point 100 degree centigrade. (ii) the mass of the water ...
76. ### Heat energy

CORRECTION (a). 500g of copper is heated from 30 degree celcius to 120 degree celcius, what is the quantity of heat supplied?(b). If the same quantity of heat is supplied to 300g of water initial at 30 degree celcius. What will be the final temperature.
77. ### Heat and property matter

What is the specific heat of a substance at its boiling point or melting point
78. ### CHECK my answers Physical science

10. If a solid piece of iron is heated and remains at 80°C until it is completely melted, you know that 80°C is (2 pts) * a. the freezing point of iron b. the melting point of iron c. the boiling point of iron d. both the freezing and melting points of iron my answer would ...
79. ### science

what is freezing and boiling point of sugar. Several sources on the Internet list the melting point as 160-186 with decomposition. The Merck Index lists "dec. 160-186. Chars and emits characteristic odor of caramel." Since it decomposes at 186, the boiling point is not ...
80. ### Chemistry

Crystallization occurs on_____________ Melting point Boiling point Cooling Freezing point
81. ### industrial process

if 100 grams of water is at 100 degree celcius are poured into 100 grams turpentine at 9 degree celcius and the resulting temperature found to be 70 degree celcius. what is the specific heat of the turpentine?
82. ### ap chemistry

A 4.47 g sample of a molecular compound is dissolved in 96 g of tetrachloromethane. The normal boiling point of the solution is 61.51 degrees celcius, the normal boiling point for CCl4 is 61.2 degrees celsius. The boiling point constant for CCl4 is 4.95K*kg/mol. What is the ...
83. ### Chemistry

What effect does lowering the pressure on the surface of water have on the boiling point? It increases the boiling point It decreases the boiling point the boiling point remains the same
84. ### science

1)effects of impurities on the boiling point of an organic compound. 2) purposes why melting points are determined. 3)suppose i am taking a melting point and the compound disappears, what must i do? Have you put any thought into these or do you expect us to do your homework? ...
85. ### science

In a serious accident, nuclear power plants reactor vessel cracks and all of the cooling water drains out. Although nuclear fission stops, radioactive decay continues to heat the reactor's 2.5× 10 to the 5 power kg uranium core at rate of 120 Mega-Watts. Once the core reaches...
86. ### chemisty

115 grams of KCl is dissolved in 750 ml of water. what are the molality, molarity, mole percent, % mass, ppm by mass. what would the freezing point and boiling point of that solution assuming Kf of water is 1.86 degree celsius/m and Kb is .0512 degree celsius/m
87. ### Solid State Chemistry

Which molecule ( KI or LiF ) has the higher boiling point? Select the single most important reason below to justify your choice should have the higher melting point Both molecules are nonpolar but the higher melting includes hydrogen bonding Both molecules are nonpolar but the...
88. ### Physics

On planet X, the alien residents use a temperature scale in which they define 0 degrees X to be the melting point of nitrogen and 100 degrees X to be the boiling point of nitrogen. What temperature difference in X degrees does a temperature change of 1 C degree correspond to? ...
89. ### chemistry

the vapour pressure of water at 20 degree celcius is 18 mm hg .if the relative humidity is 35 % the weight per litre of air at 20 degree celcius is ?
90. ### Chemistry 109

How many joules of heat are required to raise the temperature of 225 g of water from 42 degree celcius to 75 degree celcius?
91. ### physics

what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
92. ### another college chem

Calculate the boiling point of a 4.35 m benzene solution in phenol. (phenol bp=181.75 degree C and Kb=304 degree C/m)
93. ### chemistry

what is the molecular mass of a solute if a solution containing 150 g of that solute and 1.0 kg of water has a boiling point of 102.0 degree c? (Kb= 0.512 degree C/m)
94. ### chemistry

100g of stea initial at 100 degree celcius is passed through a calorimeter containing 1kg of water at 20 degree celcius. Assuming no heat loose and negligible heat capacity of the calorimeter, calculate the final temperature of the calorimeter and the content. heat of ...
95. ### Algebra

In the metric system there are two official temperature scales: degree Celsius and kelvin. The kelvin temperature scale is obtained by shifting the Celsius scale so of any heat whatsoever. An equation about the relationship between the two scales follows: kelvin~ degree ...
96. ### physics

hiw much heat is needed to raise the temperature of 0.800 kg. ethyl alcohol form 15.0 celcius to its boiling point 78.3 celcius
97. ### algebra 2

hiw much heat is needed to raise the temperature of 0.800 kg. ethyl alcohol form 15.0 celcius to its boiling point 78.3 celcius
98. ### chemistry

6.0 g potassium chromate is dissolved in 20 g water at 80 degree celcius. The solution is then cooled to 0 degree celcius. What mass of solute crystallises, assuming a supersaturated is not formed?
99. ### chemistry

what mass of steam intially at 130 degree celcius is needed to warm 200 grams of water in a 100 gram container from 20 to 50 degree celcius
100. ### Physics

The melting point of substance X is -20 degrees Celsius and the boiling point is 90 degrees Celsius. How many Celsius degrees are there between the melting point and the boiling point? 20 degrees Celsius 70 degrees Celsius 90 degrees Celsius 110 degrees Celsius