Which of the following is true of carbon? Carbon is present in all organisms and in the atmosphere.* Carbon moves from consumers to producers. Carbon must be fixed by bacteria before other organisms can use it. Carbon can only be

22,874 results
  1. Plz help me.

    Which of the following explains why your body may contain a carbon atom that was present in George Washington’s body in 1776? (1 point) Carbon moves in a one-way direction through living organisms only. Carbon moves in a one-way direction from the

  2. Science help (just 4 questions)

    1. Which of the following is an example of an environmental pressure? (1 point) the air pressure in the atmosphere a lake that is gradually running out of water a fight between two members of the same species breeding between two members of the same

  3. science

    How do fossil fuels play a role in the carbon cycle?(1 point) Fossil fuels require a lot of carbon to burn, which takes carbon out of the atmosphere. Fossil fuels are rich in carbon, and burning them returns carbon to the soil. Fossil fuels require a lot

  4. science

    What happens to carbon in plants when the plants die? The carbon is released into the soil, but it is not used again. The carbon will be released into the soil for use by the next generation.*** The carbon is not released; it is lost. The carbon is

  5. science

    The ocean stores carbon from its interactions with the atmosphere, so the ocean serves as (a) _________ for the carbon cycle. carbon flux carbon dioxide carbon source carbon sink*** Bacteria add carbon to the carbon cycle by decomposing dead organisms.***

  6. Chemistry

    Can someone answer this question? The enthalpy of combustion of solid carbon to form carbon dioxide is -393.7 kJ/mol carbon, and the enthalpy of combustion of carbon monoxide to form carbon dioxide is -283.3 kj/mol CO. Use these data to calculate ∆H for

  7. Science

    If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products? A) 2 atoms of carbon (C) B) 3 atoms of carbon (C) C) 6 atoms of carbon (C)**** D) 12 atoms of carbon (C)

  8. Science

    Which of the following is not used as evidence when constructing cladograms? a. ecological roles of present-day organisms. b. DNA sequences of present-day organisms. c. fossils of extinct organisms. d. body characteristics of extinct and present-day

  9. SCIENCE

    1. Which of the following is an example of an environmental pressure? (1 point) the air pressure in the atmosphere a lake that is gradually running out of water a fight between two members of the same species breeding between two members of the same

  10. science

    How do fossil fuels play a role in the carbon cycle?(1 point) Fossil fuels require a lot of carbon to burn, which takes carbon out of the atmosphere. Fossil fuels are rich in carbon, and burning them returns carbon to the soil. Fossil fuels require a lot

  11. science

    1. Which of the following explains why your body may contain a carbon atom that was present in George Washington’s body in 1776? (1 point) Carbon moves in a one-way direction through living organisms only. Carbon moves in a one-way direction from the

  12. science

    3. How would the carbon cycle be affected if all producers were removed? (1 point) Carbon compounds in animals would not be broken down to release carbon dioxide back into the atmosphere. Carbon would not have a way to enter the bodies of living things.

  13. Biology

    |Question| Living organisms are composed of millions of organic compounds, each having a unique structure. What element is responsible for this huge diversity of molecules? Describe the diversity of structures that can be formed and the properties of this

  14. math

    A wooden artifact from an ancient tomb contains 70% of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)

  15. Science

    Radioactive carbon-14 dating has determined that a fossil is 5.7 x 10 to the third power years old. What is the total amount of the original Carbon-14 still present in the fossil?

  16. Science Help!

    Lisa studied the models of three carbon nuclei shown below. She listed information about the carbon nuclei in a table. Name Carbon 12 number of protons 6 number of neutrons 6. Name Carbon 13 number of protons 6 number of neutrons 7. Name Carbon 14 number

  17. Science- Last question

    Which of the following is true of carbon? Carbon is present in all organisms and in the atmosphere.* Carbon moves from consumers to producers. Carbon must be fixed by bacteria before other organisms can use it. Carbon can only be released from dead

  18. science (I NEED BACKUP!!!)

    1. Which is the most complete model of feeding relationships? a.) food web b.) food chain c.) food pyramid d.) all of the above 2. _____ eat consumers only, while _____ eat both consumers and producers. a.) Producers; carnivores b.) Carnivores; omnivores

  19. Science

    Which of the following is true of carbon? Carbon is present in all organisms and in the atmosphere.* Carbon moves from consumers to producers. Carbon must be fixed by bacteria before other organisms can use it. Carbon can only be released from dead

  20. Chemistry

    The cloth shroud from around a mummy is found to have a carbon-14 activity of 8.1 disintegrations per minute per gram of carbon as compared with living organisms that undergo 15.2 disintegrations per minute per gram of carbon. From the half-life for

  21. MATH 123

    A wooden artifact from an ancient tomb contains 55% of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)

  22. Science

    1. Which of the following is true regarding the carbon cycle and food webs? A. Food webs and the carbon cycle are closely related because all living organisms are composed of carbon. B. Food webs and the carbon cycle are closely related because carbon

  23. chemistry help

    When carbon dioxide and carbon react the balanced equation is Co2+C--------------2Cq Calculate the mass of carbon monoxide formed from 4.4g of carbon dioxide

  24. math

    An artifact was found and tested for its carbon-14 content. If 88% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  25. Math

    The half-life of carbon-14, which is used in dating archaeological finds, is 5730 yr. Assume that 100% of the carbon-14 is present at time 0 yr, or x=0. Write the equation that expresses the percentage of carbon-14 remaining as a function of time.

  26. Chemistry

    In an experiment to find the percentage of calcium carbonate in sand from a beach, 1.86 g of sand reacted with an excess of dilute hydrochloric acid to give 0.55 g of carbon dioxide. CaCO3 (s) + 2HCL (aq) – CaCl2(aq) + CO2(g) + H2O (l) 1.Calculate the

  27. MA240 Please help

    An artifact originally had 16 grams of carbon-14 present. The decay model A = 16e -0.000121t describes the amount of carbon-14 present after t years. How many grams of carbon-14 will be present in 5715 years? A. Approximately 7 grams B. Approximately 8

  28. Phosphorus cycle

    Explain how the phosphorus cycle differs from the carbon cycle. The phosphorus cycle differs from the carbon cycle by the phosphorus being an essential element in molecules which carries energy to plant and animal cells. The phosphorus helps plants with

  29. chemistry

    calculate the weight of carbon momoxide having same number of O2 atoms as are present in 22g of carbon dioxide

  30. Science/Geology

    In living things, what is the source of the carbon-14 that is used in radiocarbon dating? A. Carbon dioxide in rocks B. Carbonic acid in caves C. Carbon dioxide in the atmosphere D. Carbon dioxide in water

  31. chemistry

    The enthalpy of combustion of carbon to carbon dioxide is -394 kJ according to the equation: C (s) + O2 (g) --> CO2 (g) How many kJ of heat are released when 24.0 g of carbon are burned in an excess of oxygen

  32. Chemistry pretty urgent!!!!!!!

    Chemical bonding question! The partial Lewis structure that follows (Figure 1) is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies the octet rule, and there are no unshared electron pairs in the molecule. The

  33. science

    Why is the ocean described as the world’s largest carbon sink? Sink/Sources in the carbon cycle? Carbon movement through the marine carbon cycle. Help

  34. applied algebra

    An artifact was found and tested for its carbon-14 content. If 74% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years. 1 yr

  35. science - biology

    A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and analyses the

  36. calculus

    radioactive Carbon 14 in a dead organism decays according to the equation A=A e^.000124t where t is in years and A0 is the amount at t=0. Estimate the age of a skull uncovered in an archeological site if 10% of the original Carbon 14 is still present.

  37. Science

    If I have radiolabeled Carbon and I put it in Carbon Dioxide in a greenhouse, where will the carbon go? Where will it end up?

  38. Science

    (Another question sorry!) Which of the following is true of carbon? A. Carbon is present in all organisms and in the atmosphere.** B. Carbon moves from consumers to producers. C. Carbon must be fixed by bacteria before other organisms can use it. D. Carbon

  39. Science

    Which of the following is true of carbon? A. Carbon is present in all organisms and the atmosphere** B. Carbon moves from consumers to producers C. Carbon must be fixed by bacteria before other organisms can use it D. Carbon can only be released from dead

  40. Physics

    (a)-A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams of Carbon-14 present when it died, determine the age of the fossil? Half life of Carbon-14 is 5700 years. (b)How much Carbon-14 will be present in the sample

  41. Physics

    (a)-A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams of Carbon-14 present when it died, determine the age of the fossil? Half life of Carbon-14 is 5700 years. (b)How much Carbon-14 will be present in the sample

  42. Intermediate Maths

    (a)-A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams of Carbon-14 present when it died, determine the age of the fossil? Half life of Carbon-14 is 5700 years. (b)How much Carbon-14 will be present in the sample

  43. Final Maths

    (a)-A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams of Carbon-14 present when it died, determine the age of the fossil? Half life of Carbon-14 is 5700 years. (b)How much Carbon-14 will be present in the sample

  44. Shelled marine organisms

    How do the shelled marine organisms contribute to the carbon cycle? They contribute to the carbon cycle by releasing carbon dioxide back into the atmosphere by converting carbohydrates and oxygen into carbon dioxide and water.

  45. Biology

    Carbon is a an element with an atomic number of 6. Based on this information, which of the following statements is true? A. Carbon can be broken down into simpler component substances. B. Each carbon atom will always have 6 protons. C. Each carbon atom

  46. Calculus Help Please!!! URGENT!!!!

    Carbon-14 has a half-life of 5700 years. In a living organism, the ratio of radioactive carbon-14 to ordinary carbon remains fairly constant during the lifetime of the organism. After the organism’s death no new carbon is integrated into the organism’s

  47. physics

    before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14

  48. physics

    before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14

  49. pre calculus

    The age of a document is in dispute, so archaeologists test for carbon-14. Due to radioactive decay, the amount A of carbon -14 present compared to the initial amount A0 after t years is given by the formula A(t) = A0e^-0.000124t . If 72% of the original

  50. algebra

    An artifact was found and tested for its carbon-14 content. If 75% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.) thank you

  51. Can some guide me

    An artifact was found and tested for its carbon-14 content. If 71% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.)

  52. Homework test

    An artifact was found and tested for its carbon-14 content. If 70% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  53. math

    An artifact was found and tested for its carbon-14 content. If 81% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years. yr

  54. Algebra

    An artifact was found and tested for its carbon-14 content. If 75% of the original carbon-14 was still present what is its probable age to the nearest 100 years?. carbon -14 has a half-life of 5,730 years.

  55. algebra

    An artifact was found and tested for its carbon-14 content. If 84% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  56. math

    An artifact was found and tested for its carbon-14 content. If 83% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  57. math

    An artifact was found and tested for its carbon-14 content. If 83% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  58. math

    An artifact was found and tested for its carbon-14 content. If 76% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.)

  59. Algebra

    An artifact was found and tested for its carbon-14 content. If 74% of the orginal carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half life of 5730 years).

  60. algebra

    An artifact was found and tested for its carbon-14 content. If 79% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  61. Algebra

    An artifact was found and tested for its carbon-14 content. If 77% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  62. algebra

    An artifact was found and tested for its carbon-14 content. If 84% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  63. College Math

    An artifact was found and tested for its carbon-14 content. If 88% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  64. math

    An artifact was found and tested for its carbon-14 content. If 76% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  65. Algebra

    An artifact was found and tested for its carbon-14 content. If 76% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.)

  66. Math

    An artifact was found and tested for its carbon-14 content. If 88% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years. ? yr

  67. math

    An artifact was found and tested for its carbon-14 content. If 79% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.)

  68. chemistry

    i cant understand anything in carbon and its compounds. can you give me any the basics of what i need to learn in carbon and its compounds Carbon has a usual oxidation state(valence) of +4 and it can bond to itself. Therefore, there are millions of carbon

  69. Biology

    The half-life of Carbon-14 is 5730 years. What is the age of a fossil containing 1/16 the amount of Carbon-14 of living organisms? Explain your calculation.

  70. biology

    The answer to which of these scientific questions would MOST likely explain why all life on Earth is based on carbon? A. How many carbon isotopes are stable? B. How much carbon is found in Earth’s crust? C. What are the naturally occurring states of

  71. can you help me with one science question Ms. Sue

    3. How would the carbon cycle be affected if all producers were removed? (1 point) Carbon compounds in animals would not be broken down to release carbon dioxide back into the atmosphere. Carbon would not have a way to enter the bodies of living things.

  72. Chem

    Living organisms give a Carbon-14 decay rate of 15.3 counts/min for each gram of carbon in the sample. A sample of bristle cone pine wood has a decay rate of 3.20 counts/min per gram of carbon. Calculate the age of the wood from the radiochemical evidence.

  73. Chemistry

    An archeological artifact was subjected to radiocarbon dating. The artifact showed a carbon-14 decay rate of 13.8 disintegrations/ min per gram of carbon. Carbon-14 has a half-life of 5715 years, and currently living organisms decay at the rate of 15.3

  74. Physical Science

    Diamond is a covalently bonded substance made of pure carbon. Each carbon atom has six total electrons so this means carbon shares ________ electron(s) with other carbon atoms. A) one B) two C) four D) six Help Please!

  75. Science

    Which of the following determines the type of biome classification that will be made for a particular region? Climate Size Mineral deposits Number of human settlements Think about how the amount of energy changes as you move stepwise from producers to

  76. Environmental Science

    1. How are carbon emissions related to the carbon that accumulates in the atmosphere? 2.How is carbon absorption related to the carbon that accumulates in the atmosphere? 3.What happens to carbon in the atmosphere when carbon emissions are equal to carbon

  77. biology

    14 points Save A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and

  78. Science

    Choose the explanation that does the following: (1) identifies the element used in carbon dating and (2) explains why the element is used. A. iodine-131; iodine is present in the thyroid glands, is radioactive, and has a very long half-life B. nitrogen-14;

  79. Chemistry

    An artifact has a carbon-14 to carbon-12 ratio that is one-fourth the carbon-14 to carbon-12 ratio of a similar modern object. How old is the artifact? (The half-life of carbon-14 is 5,715 years.)

  80. chemistry

    A sample of carbon dioxide has a mass of 47.4 g. How many carbon atoms are present?

  81. Radioactivity

    1. A granite rock is thought to be about 2 billion years old. why is it not possible to determine the age of the Rock using carbon-14 dating? 2. A hair sample has 80% of its original carbon-14 present. what is the age of the sample? 3. A bone fragment has

  82. Chem URGENT!!

    Which bond is most polar? F-Cl O-P O-S F-F Si-O Which species has the shortest carbon/oxygen bond? carbon monoxide carbon dioxide carbonate anion all carbon/oxygen bonds have same length Plz Help me with this....I need to see if I answered it right I put

  83. Chemistry

    How many atoms of carbon are present in 49 g of a compound that is 54 . 1% carbon, by weight?

  84. Chemistry

    A piece of wood found in an ancient city has a carbon-14 to carbon-12 ratio that is one-eighth the carbon-14 to carbon-12 ratio of a tree growing nearby. How old is the piece of wood? (The half-life of carbon-14 is 5,715 years.)

  85. Chemistry

    1. Hydrogen gas combines with oxygen gas to yield water. if 15 g O2 is present in the reaction, compute how much water will be produced. 2. Ten (10)grams methane gas combines with oxygen gas to form water and carbon dioxide. How much water is produced from

  86. Math

    Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react w/ nitrogen to produce radioactive carbon-14. Radioactive carbon-14 enters all living tissue through carbon dioxide. As long as it is alive, carbon-14 is maintained in the

  87. chemistry

    How many carbon(C) atoms are present in 30. mol of carbon? 1.8*10^25

  88. Calculus

    The amount of carbon-14 still present in a sample after t years is given by the function where C0 is the initial amount. Estimate the age of a sample of wood discovered by an archeologist if the carbon level in the sample is only 18% of its original

  89. Chemistry

    Calculate the number of moles of carbon atoms present in 2.2 g of ethanol (C2H6O). For this question, I would just need to find the molar mass of carbon, right? Not the molar mass of all of ethanol? So it would just be 2.2 g/ 24.02 g/mol which would equal

  90. physics

    The mass of a carbon atom is 2 x 10 ^ -26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? I got 2.5 x 10^-21 which is correct. The second question states: Two carbon atoms are joined by a spring-like carbon-carbon bond. The

  91. Chem

    which substance cannot be decomposed by a chemical change? carbon dioxide, methane, carbon monoxide, or carbon

  92. calculus

    A wooden artifact recovered from a tomb contains 29% of the carbon-14 that is present in living trees. The half life of carbon-14 is 5730 years. How long ago was the artifact made?

  93. physics

    The half-life of carbon-14 is 5730 years. How much of a 50 g sample of carbon-14 is present after 11,460 years?

  94. Chemistry

    If 100.0 g of carbon-14 decays until only 25.0 g of carbon is left after 11,460 y, what is the half-life of carbon-14?

  95. biology

    If you inject carbon nanotubes into the body, can we produce antibodies against it? some ideas: - my answer is yes and no... the carbon nanotubes are too large for the t-cell to destroy it; therefore, they won't have an affect. -plus our whole body is made

  96. calculus BC

    Carbon-14 decay (radiocarbon dating) is used in archaeology to measure the age of ancient pottery. Carbon-14 has a half-life of 5830 years. How old is a pot in which 20% of the Carbon-14 has decayed?

  97. Chemistry

    How many atoms of carbon are present in 31.4 g of a compound that is 16.2% carbon, by weight? Answer in units of atoms.

  98. CHEMISTRY

    How many atoms of carbon are present in 12.9 g of a compound that is 36 .7% carbon, by weight? Answer in units of atoms.

  99. Pre-calc

    A wooden artifact from an ancient tomb contains 50 percent of the carbon-14 that is present in living trees. How long ago, to the nearest year, was the artifact made? (The half-life of carbon-14 is 5730 years.)

  100. chemistry

    Carbon is able to form large numbers of organic compounds because carbon can A.form 4 bonds B.form single, double and triple bonds C.form chains, rings, spheres and sheets D.the carbon-carbon bond is very stable E.all answers are correct

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