1. science

    what shows that the sea water is a mixture and not a pure substance? a. it has a sharp boiling point b. it has definite composition c. it consist of a single phase d. the components lose their individual properties
  2. Chemistry

    A 2.35 g sample of a substance suspected of being pure gold is warmed to 72.2 ∘C and submerged into 15.5 g of water initially at 24.1 ∘C. The final temperature of the mixture is 26.5 ∘C. Part A What is the heat capacity of the unknown
  3. algebra

    Your automobile radiator contains 15 quarts of an antifreeze mixture. A test shows the mixture is 40% antifreeze and 60% water. The owner's manual says the mixture should be 50% antifreeze and 50% water. How much of the mixture should be removed and
  4. Physical Chemistry

    Assuming that the osmotic pressure of a sample of sea water at 10 C is 25.5 atm, calculate the work required under reversible conditions at this constant temperature to prepare 9 litre of pure water from this sea water. (Take the available volume of sea
  5. Chemistry

    Which of the following best describes the difference between a mixture and a pure substance? A. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. B. A mixture has the same properties throughout; a
  6. chem

    A blood sample contains several different types of cells, each of which contains different combinations of specific ions and molecules. The cells are suspended in water, and the water also contains many molecules and ions. Which term or terms could be used
  7. Physical chemistry

    Estimate the vapor pressure of sea water at 20C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Na+ and Cl- ions, each present in about .50 mol/dm^3. I'm pretty sure the formula to use is pj=xjpj'.
  8. Organic Chemistry

    In order to obtain pure synthetic plant hormone, a 2:1 mixture of water and ethanol is used as the crystallizing solvent. Why is a solvent mixture used? A. Organic compounds are not soluble in pure ethanol. B. Ethanol and water have similar boiling points,
  9. chem

    The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
  10. science

    The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
  11. chemistry

    The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
  12. chemistry

    Is diamond a pure substance, a homogeneous mixture or a heterogeneous mixture????
  13. math

    a mixture of alcohol and water is 35% acid. if the mixture contains a total of 40L, How many liters of pure acid are in the mixture? how many liters of pure water are in the mixture?
  14. algebra

    a mixture of alcohol and water is 35% acid. if the mixture contains a total of 40L, How many liters of pure acid are in the mixture? how many liters of pure water are in the mixture?
  15. chm

    How would you classify the following material?swimming pool water homogeneous mixture<<< heterogeneous mixture a pure element a pure compound depends on how many children have been in it
  16. ochem

    Can you suggest some possible reasons for using a mixture of water and ethanol (1:1 mixture H2O/EtOH) as crystallizing solvent rather than using either pure ethanol or pure water?
  17. Science (Asap)

    Compare and contrast: When you combine two or more different substances,you get a mixture.The substance aren't mixed evenly.Their properties don't change.The substance can be separated from the mixture.For example,sand is a mixture that can be separated
  18. Chemistry

    How would I calculate this? 30.0 mL of pure water at 280. K is mixed with 50.0 mL of pure water at 307 K. What is the final temperature of the mixture?
  19. chemistry

    2. Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring
  20. Science

    Is rubbing alcohol a pure substance or a mixture?
  21. Science

    Is baking soda a pure substance or a mixture?
  22. Chemistry

    When 4.76 g of a solid mixture composed of NH4Cl and CaCl2 was dissolved in 100.0 mL of water, the temperature of the water rose by 4.73°C. How many grams of each substance was in the mixture?
  23. science

    Is blood a substance or mixture? Is iron a substance or mixture? I think blood and iron are both substances but my friend thinks that blood is a mixture and iron is a substance. PLEASE HELP ME!!!!!! Substance is a very general term. Every piece of matter
  24. Chemistry

    At room temperature, ethanol's density is 0.789 g/mL while water's density is 0.997 g/mL. When a few milliliters of ethanol are added to water, the two liquids mix. A student is given a unknown liquid at room temperature and experimentally determines its
  25. science --- check my answers!

    help pls asap!!!!! check my answers!!! 4.) A certain object has a volume of 25.0 mL and a mass of 100g. What is the density of the object? a)0.250 g/mL b) 4.00/mL*** c)125 g/mL d) 2500 g/mL 5.)Which of the following is a chemical property of aluminum?
  26. Physical Sciences

    Is a diamond a pure substance, homogeneous or heterogeneous mixture?
  27. weighted averages

    How do you do this? a pineapple drink contains 15% pineapple juice. how much pure pineapple juice should be added to 8 quarts of the drink to obtain a mixture containing 50% pineapple juice? Let X be the amount of pure pineapple that you must add, in
  28. Math please

    A 75% alcohol concentration mixture of water and alcohol was made by mixing 30ml of pure alcohol with 150 ml of original mixture of water and alcohol. what was the alcohol concentration of the orignal mixture The amount of water has not changed. Since the
  29. math

    When a chemist dilutes pure acid with another substance, the resulting mixture is no longer pure acid. Consistent with the words, pure acid is 100% acid. So, there are 20 grams of pure acid in 20 grams of a pure-acid solution. Laura, a chemist, has 20
  30. Chemistry

    You are given a jar containing a mixture of three different solid substances. The particles of each substance are larger than 0.5 cm in diameter. All you know about the substances is that each is a pure metal. Describe a method for determining the
  31. chem

    what is a liquid solution and a gaseous solution? [define plz] liquid solution: sea water gas solution: air i don't need examples. i need definitions. they are not in my book. a liquid solution is a mixture of atoms/ions/chemicals, etc. dissolved in water.
  32. Science

    When water is mixed with another substance and the mixture will not scatter light, the mixture is a:? 1) suspension  2) compound  3) solution  4) substrate 
  33. Physical Science

    1. which of the following should be classified as a suspension? A. soda** B. sand in water C. glass D. milk 2. Which of the following is an of example of a chemical property? A. density B. flammability C. hardness** D. melting point 3. Which state of
  34. Math

    A mixture of water and sucrose is 10% sucrose by weight. How many grams of pure sucrose must be added to a 200-gram sample of this mixture to produce a mixture that is 20% sucrose?
  35. Algebra

    I have 2 questions in math that I am not quite sure about... 1. Mandy begins bicycling west at 30 mph at 11 A.M. If Liz leaves from the same point 20 min. later bicycling west at 36 miles per hour, when will she catch Mandy? 2. A mixture of 10% acid and
  36. Algebra

    I have 2 questions in math that I am not quite sure about... 1. Mandy begins bicycling west at 30 mph at 11 A.M. If Liz leaves from the same point 20 min. later bicycling west at 36 miles per hour, when will she catch Mandy? 2. A mixture of 10% acid and
  37. Math

    180 ml of a mixture of water and alcohol with 90% alcohol concentration is mixed with 70 ml of pure water. what is the alcohol concentration of the new mixture? Do the following: 1) Find out how many ml of alcohol was in the first mixture. (What is 90% of
  38. Algebra

    The radiator in Natalies car contains 6.3L of antifreeze and water.This mixture is 30% antifreeze.How much of this mixture should she drain and replace with pure antifreeze so that there will be a mixture of 505 antifreeze?
  39. science

    1.What two things happen to particles in a substance when the substance is heated? 2. What are the three most common states of matter on Earth? 3. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container
  40. chemistry

    The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. °C results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to
  41. science

    Would iron be considered a substance or a mixture? How about blood? Iron is: http://en.wikipedia.org/wiki/Iron substance is a very general term: See definition 3: http://www.m-w.com/dictionary/substance Now blood is living tissue and as such very complex.
  42. Chemistry

    Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until equilibrium was established.
  43. science

    is tap water a pure substance..?
  44. Grade 9 science

    What is an example of a homogeneous mixter that is a solid liqued or gas an example of homogeneous mixter that is a solid Steel is a homogenous mixture of iron, carbon, and other metals. air is a homogenouse mixture of gas Sea water is a homogenous mixture
  45. Trig problem

    During a 12- hour period, the tides in one area of the Bay of Fundy causes the water level to rise to 6 m above the average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2m as measured against a pier. Suppose the
  46. Algebra I

    Scott wants to make 6 gal of a 50% sugar solution by mixing together a 60% sugar solution and pure water. How much of each solution must he use? mixture 1 @ 60% = x gallons pure water = 100% - x (??? that's my question...is that correct? or is it 0?)
  47. Math

    A 75% alcohol concentration mixture of water and alcohol and was made by mixing 30 ml of pure alcohol with 150 ml of original mixture
  48. science

    Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its
  49. trig question

    During a 12- hour period, the tides in one area of the Bay of Fundy causes the water level to rise to 6 m above the average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2m as measured against a pier. Suppose the
  50. chemistry

    Two solutions are prepared. In Solution A, 5.0 g of a substance of molecular weight 50 is dissolved in 100 mL of pure water. In Solution B, 5.0 g of a substance with molecular weight of 75 is dissolved in 100 mL of pure water. The solute is non volatile
  51. mixture problem

    Lisa will make punch that is 25% fruit juice by adding pure fruit juice to a 2-liter mixture that is 10% pure fruit juice. How many liters of pure fruit juice does she need to add?
  52. chemistry

    If you have 12 moles of a substance, how many molecules do you have of that substance? Suppose the substance has a molecular weight of 342. How many grams of that substance would you have to dissolve in a liter of water to make a 12 M solution?
  53. phyical science

    Which of the following is NOT a pure substance? A. milk B. oxygen C. water D. carbon dioxide
  54. Physical Science

    Which of the following is not a pure substance? 1. milk 2. oxygen 3. water 4. carbon dioxide
  55. Chemistry

    Sea water conducts electricity. Which statements give the best explanation for this a) Ions are able to move around in sea water b) Electrons can pass from ion to ion in the sea water c) The sea water contains more ions with positve charges than ions with
  56. chemistry

    Subject – equilibria Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until
  57. Chemistry

    Regarding conductivity: 1. If a solution has a high conductivity, it indicates that there are a lot of __________________ in solution. [Answer: ions] 2. Pure acetic acid does not conduct electricity, nor does pure water, but a mixture of the two does
  58. chemistry

    in making a solution of an unknown solid substance to test it for the presence of ions, would it matter if you used pure water or tap water to make the solution
  59. college algebra word problem

    A goldsmith has two alloys that are different purities of gold. The first is 3/4 pure and the second is 5/12 pure. How many ounces of each should be melted and mixed in order to obtain a 6 oz mixture that is 2/3 pure gold?
  60. Science test review

    Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter
  61. Chemistry

    A sample of hydrogen gas (H2) is produced in a laboratory by displacement of water. A 645 mL sample of hydrogen is collected at 25 degrees Celsius and a total pressure of 758 torr. Collecting gas by water displacement causes the gas to become saturated
  62. Chemistry

    Convert 6.42x10^23 atoms a pure substance to moles of that substance. That is all it says. Please help. Thank you.
  63. science

    Why is it difficult to distinguish between some pure substances and solutions? What methods can overcome this to define if either it is a pure substance or solution?
  64. chemistry

    Why is it wise to clean the aluminum? Why is the reaction done in the hood? Why must suspended solids be removed from the basic solution? Why is an ethanol-water mixture, rather than pure water, used to wash the collected alum?
  65. Chemistry

    A dry mixture of kno3 and sand could be separated by 1. adding water to the mixture and filtering 2. adding water to the mixture and evaporating 3. heating the mixture to a high temperature 4. cooling the mixture to a low temperature
  66. Science

    Roger made a mixture of salt and sand.Which of the following procedures explains the easiest way to separate the mixture? A.Pour the mixture into a glass of water and stir it until the salt dissolves.Pour the micture through a filter.Evaportate the water.
  67. Chemistry

    Why is "pure orange juice" not a pure substance?
  68. trig

    During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the
  69. trig question...

    During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the
  70. CHEMISTRY

    Is it possible to obtain pure (200-proof) ethanol using fractional distillation from a fermentation mixture that contains equal amounts of water and ethanol? Explain your answer. I know that some water will still remain i would just like to know why some
  71. pre lab Q on chromatography

    suppose that there are two components, A and B, in a mixture. The chemical affinity of A for the stationary pahse is less than that of B and the chemical affinity of A for the mobile phase is greater than that of B. If the mixture is subjected to paper
  72. Algebra

    Pure water is being added to a 25% solution of 120 milliliters of hydrochloric acid. How much water should be added to reduce it to a 15% mixture ?
  73. Physics

    In an immersion measurement of a boy’s density, he is found to have an apparent weight of 6.86-N when completely submerged in water with lungs empty. The mass of the boy is 68.0-kg in air. The density of water is 1000-kg/m^3. a)Determine the density of
  74. Science

    2.)Which of the following are pure substances? A.)Chocolate Milk B.)Orange Juice C.)Sea Water*** D.)Hydrogen Peroxide (H2O2) C?
  75. Chemistry

    During fractional distillation of ethanol/water mixture, why can't pure ethanol be obtained (i.e. distillated contains a little water)?
  76. MATH

    i really need help on this question!! I need to solve it using a system of two equations, the question says that an automobile radiator contains 16L of antifreeze and water. this mixture is 30%antifreeze. how much of this mixture should be drained and
  77. chemistry

    You need 715 mL of a 45% alcohol solution. On hand, you have a 55% alcohol mixture. How much of the 55% alcohol mixture and pure water will you need to obtain the desired solution?
  78. Chemistry

    Describe how one would obtain the stated pure product from the following mixtures and assume that this cannot be achieved simply by distillation of the original mixture: 1. benzoic acid from a mixture with ammonium benzoate 2. phenylamine from a mixture
  79. science

    Which evidence from the sea floor shows that tectonic plates move? A) the sea floor is youngest near a mid ridge and farther away. B) the sea floor is much older the cont. C) mid ocean ridges form the longest range of mountains on earth. D) the sea floor
  80. Science

    13.)How can substance A and B be compared? Choose all that apply. A.)The particles of substance A have more energy than the particles of substance B.*** B.)The particles of substance A are more tightly held together than the particles of substance B.
  81. Math

    An advertisement for a pineapple drink claims that the drink contains 15%pineapple juice. How much pure pineapple juice would have to be added to 8 quarts of the drink to obtain a mixture containing 50% pineapple juice? This is a mixture problem. Pineapple
  82. AP CHEMISTRY

    A)In a chemical reaction two gases combine to form a solid. What do you expect for the sign of ΔS? B) For which of the following processes does the entropy of the system increase? (Select all that apply.) -> alignment of iron filings in a magnetic
  83. Chemistry

    46.9 g of a substance at 90.8°C is added to 51.8 g of water at 24.8°C. The final temperature of the water and substance is 40.5°C. The specific heat of water is 4.184 J/g·°C. What is the specific heat of the substance? I think the equation that I need
  84. Physics

    The graph shows the temperature versus time relationship for 2 kg of particular substance. The substance is in the solid state at a room temperature of 20 degrees Celsius. - The 100 joules of heat is needed to completely change the substance from a solid
  85. Science

    What is a mixture in which one substance spreads evenly throughout another substance
  86. ORGANIC CHEMISTRY

    NAME THE PROCESSES OR TECHNIQUES IN THE FOLLOWING. 1.SEPARATION OF A SOLID FROM A SOLUTION 2.WHEN WATER IS COLD TO FORM ICE 3.WHEN WATER IS BOIL TO FORM VAPOR 4.WHEN IODINE IS HEATED DIRECTLY TO FORM GAS WITHOUT BEING LIQUID 5.WHEN STEAM IS COLD TO FORM
  87. Chemistry

    1. Which of the following is not true? a. The freezing point of sea water is lower than the freezing point of pure water. b. The boiling point of a water sample from the Salt Lake is lower than the boiling point of pure water. c. The freezing point of 0.1
  88. ochem

    If you recrystallize a compound with a 1/2 ethanol/water mixture and water remains in the compound after recrystallization, would that change the melting range of the pure compound?
  89. English

    What can we do to make turtles live in the sea again(Because of water pollution, turtles want to leave.)? 1. We can clean up the sea. 2. We can pick up the garbage in the sea. 3. We must not throw garbage into the sea anymore. 4. Factories must not throw
  90. science

    Which of these is a pure substance? grape juice, salt water, table salt or gasoline?
  91. Physics

    Calculate the specific heat capacity of substance x from the following data. A container made of the substance x has a mass of 3.6kg and contains 14kg of water. A 1.8kg-piece of the substance x initially at the temperature of 180°C is dropped into the
  92. math

    the diagram shows a piece of wood in the shape of a cuboid. diagram: 3cm width, 20cm length, 1.2m for the volume of cuboid The piece of wood is 3cm by 20cm by 1.2m. The mass of wood will float in sea water if the density of the wood is less than the
  93. Science

    Which substance is NOT a mixture. A. Soil B. Concrete C. Soda D. Gold Which of those substances do you think is not a mixture? Which is only made up of one thing?
  94. Calculus

    A tank contains 100 grams of a substance dissolved in a large amount of water. The tank is filtered in such a way that water drains from the tank, leaving the substance behind in the tank. Consider the volume of the dissolved substance to be negligible. At
  95. Chemistry

    I have a solution made up of 100 ml of distilled water and 2.0g of NaOH. I need to determine the total volumeof the solution in order to the calculate the mass of the reaction mixture. How do I do this? We are to assume the density of the solution is the
  96. physics

    If a very large iceberg were to float to warmer waters and melt, what, in principle, would happen to the overall sea-level? A. sea-level would rise very slightly. B. sea-level would fall very slightly. C. sea-level would stay the same. *I would say A
  97. PLS HELP ASAP 1 SUPER HARD & ANNOYING QUESTION

    Use the diagram to answer question 13. so substance A looks like a row of three little circles on the top and bottom all organized (total six dots). substance b is all clumped together circles and is disorganized. 13. How can substance A and B be compared?
  98. Science

    How Is a compound different from a mixture? it is made of one substance It cannot be made of organic materials It cannot be broken down It cannot be separated by a physical change I don't know  This formula shows the chemical reaction that occurs when the
  99. Physics

    3/2/2016 An unknown substance at a temperature of 20 degrees Celsius is warmed up to 50 degrees when water at 80 degrees is added to it. The sum of the masses of the unknown substance and water is equal to 1000grams. In another experiment, the same
  100. Chem

    At 58.8 degrees C and at a total pressure of 1.00 atm the mole percent of acetone in the vapor state above a solution of acetone and water containing 70. mol % acetone is 87.5%. Assuming the solution to obey Raoult's Law, determine the vapor pressure of