Which substance can not be decomposed by ordinary chemical means? how? 1. methane 2. mercury 3. ethanol 4. ammonia

15,852 results
  1. Science~Ms. Sue

    If you are describing methane as a gas that easily catches fire, you are describing a ____. A. state of matter*** B. physical property C. chemical property D. chemical formula I think it's A

  2. Chemistry

    13) Mercury is an environmental pollutant because it can be converted by certain bacteria into the very poisonous substance dimethyl mercury, (CH3)2Hg. This compound ends up in the food chain and accumulates in the tissues of aquatic organisms,

  3. chemistry

    A chemist determined by measurements that 0.0850 moles of mercury participated in a chemical reaction. Calculate the mass of mercury that participated in the chemical reaction. Round your answer to 3 significant digits.

  4. Chemistry

    Write balanced chemical equations for all transferals of the compounds from organic to aqueous phases and for all precipitation reactions. **Note: If a compound does not move from one layer to another, no reaction has occurred, and no equation can be

  5. Chemistry please help

    Elemental mercury was first discovered when a mercury oxide was decomposed with heat, forming mercury metal and oxygen gas. When a 0.204-g sample of the mercury oxide is heated, 0.189 g of mercury metal remains. a)what is mole ratio of mercury to oxygen in

  6. science

    The total energy of motion in the molecules of a substance is called? ?is the average amount of energy of motion in the molecules of a substance. A ? Is a thin glass tube with a bulb on one end that contains a liquid usually mercury or a colored alcohol.

  7. CHEMISTRY FORMULA

    How would you write the chemical formula for Mercury(I) nitrate. i have Hg(NO3)2 since the charge of nitrate is -2 and Mercury's is 1. However, upon checking online i found that the correct formula is Hg2(No3)2. I don't understand where the subscript 2 of

  8. Chemistry

    A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of

  9. chemistry

    Gaseous methane CH4 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 0.481 g of methane is mixed with 2.9 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the

  10. Chemistry

    Are the following physical or chemical: a. dew is dried by the sun a dark cloth is faded by the sunlight c. grape juice is converted to wine d. soap is dissolved in water a.physical b.physical c.chemical d.chemical Physical changes are those in which the

  11. Chem

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

  12. chemistry

    Consider the following reagents: zinc, copper, mercury (density: 13.6 g/mL), silver nitrate solution, nitric acid solution. a. Given a 500-mL Erlenmeyer flask and a balloon can you combine two or more of the foregoing reagents to initiate a chemical

  13. Chemistry

    Which substance can not be decomposed by ordinary chemical means? how? 1. methane 2. mercury 3. ethanol 4. ammonia

  14. Intergrated Science A

    Which answer choices best indicate that a substance has experienced a chemical change? Select all that apply. when the substance changes temperature when the substance changes shape when the substance changes volume when a new substance is formed

  15. science

    'the scale of a mercury-in-glass thermometer is linear. one such thermometer has a scale extending from -10 degrees Celsius to 110 degrees Celsius. the length of the scale is 240mm.' what is linear? what is meant when the question said the scale is linear?

  16. chemistry

    The chemical substance in natural gas is a compound called methane. Its molecules are composed of carbon and hydrogen and each molecule contains four atoms of hydrogen and one atom of carbon. In this compound, 0.33597g of hydrogen is combined with 1g of

  17. physics

    mercury rotates about its own axis once every 58.6 Earth days. a satellite orbits mercury once every murcurian day. how high is this satellite above mercury's surface? mass of mercury = 3.2x10^23 kg. the radius of mercury is 2400km.

  18. chemistry

    a.Write the balanced chemical equation for the reaction of methane and sulfur. (Type your answer using the format CO2 for CO2. Use the lowest possible coefficients.) 1CH4 + 4S --> 1CS2 + 2H2S (b) Calculate the theoretical yield of carbon disulfide when

  19. Chemistry

    The enthalpy of vaporization of mercury is 59.1 kJ/mol. The normal boiling point of mercury is 357*C. What is the vapor pressure of mercury at 25*C?

  20. 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?

  21. chemistry

    THE HEAT OF COMBUSTION OF METHANE IS -50.38 KJ /MOL . HOW MANY MOLES OF METHANE MUST BE BURNT IN ORDER TO PRODUCE 137KJ MM[METHANE]=16.04NG/MOL

  22. chem

    Mercury(II) Oxide decomposes upon heating, producing elemental mercury. This reaction has an enthalpy value of 90.8 kJ/mol. How much heat is required to produce 2000 lbs of mercury?

  23. Science

    Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction.

  24. Chem

    A 76.00-pound flask of mercury costs $159.00. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? What is the price of one gram

  25. Chemical Formula

    How would you write the chemical formula for Mercury(I) nitrate. I have Hg(NO3)2 since the charge of nitrate is -1 and Mercury's is 1. However, upon checking online i found that the correct formula is Hg2(No3)2. Given that the charge for mercury in this

  26. chem

    Write the chemical formula for mercury(I) iodate

  27. Chemistry

    The freezing point of mercury is -38.8°C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0°C to -38.8°C and then frozen to a solid? (The

  28. Chemistry

    A 76.00-pound flask of mercury costs $132.00. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values.

  29. Chemistry

    The densities of gases A, B, and C at STP are 1.25g/L, 2.87 g/L, and .714 g/L. Calculate the molar mass of each substance. Indentify each substance as ammonia, sulfur dioxide, chlorine, nitrogen, or methane.

  30. Science help

    A student combined water, sugar, and salt into a beaker. Which of the following statements are true? a. The individual substances can be separated by physical means.** b. The individual substances cannot be separated by physical means. c. A new substance

  31. 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.

  32. Chemistry

    A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of a laboratory that measures 15.2 m long, 6.6 m wide, and 2.4 m high. (a) Calculate the mass of mercury vapor (in grams) in the room at 20°C. The vapor pressure of mercury

  33. chemistry

    The freezing point of mercury is -38.8°C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0°C to -38.8°C and then frozen to a solid? (The

  34. Chemistry

    If the amount of mercury in a polluted lake is 0.4 µg Hg/mL, what is the total mass in kilograms of mercury in the lake? (The lake has a surface area of 100mi^2 and an average depth of 20 ft.) I'll probably be able to solve this once I know what it's

  35. science

    A chemical reaction in which to or more substance undergo a chemical union to form more complex substance is a what reaction?

  36. 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?

  37. chemistry

    Whenever organic matter is decomposed under oxygen free conditions, methane is one of the products. Thus enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry (dHrxn for the combustion of

  38. Chemistry

    One proposed design for a Mars rover uses a methane gas fuel cell as its power supply. The methane fuel can be made on Mars using a chemical reaction that has been known for over 100-a the Sabatier methanation reaction: C02(g) + 4H2(g) CH4(g) +2H2O(g)

  39. science

    2 what happens during a physical change new substance are formed the identity of the substance is change A chemical reaction occurs the form of a substance change but its identity. 3when enough heat is added to liquid water it boils and bubbles of water of

  40. Chemistry

    The freezing point of mercury is -38.8°C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0°C to -38.8°C and then frozen to a solid? (The

  41. Chemistry

    If 3.15g of mercury oxide are thermally decomposed to mercury and oxygen, what mass of oxygen Will be produced?

  42. 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

  43. science

    What is something a scientist could add to or subtract from an unknown substance that will always reveal information about the physical and/or chemical properties of the substance? light heat** vinegar iodine is that right?🤠

  44. Chemistry

    I looked and could not find anything on iron smelting? Could you explain to me why it is a chemical process? Iron ore is a chemical compound, it has to be decomposed into iron + other. Surely you jest!!! I went to www.google.com and typed in Iron smelting

  45. Chemical / Physical Changes Quiz check my answers

    1. A ____________________ occurs when two or more substances interact forming a new substance. A. Physical change B. Chemical change **** C. Ecosystems D. Physical reaction 2. Is iron rusting a Physical or Chemical Change? A. Physical Change B. Chemical

  46. science

    What happens when a candle is alight is the subject. Explained both changes using the Big Idea of Energy? Can anyone help please or explain? I don't understand the question. Can you repost and clarify please? What happens when a candle is alight (on one

  47. chemistry

    Which of the following is true of a substance with a pH of 11.0? A. The substance is an acid. B. The substance is a base. C. The substance is neutral. D. The substance is a transition metal. I think A

  48. chemistry

    if 3.15g of mercury are thermally decomposed to mercury and oxygen what mass of mercury will be produced and how many oxygen molecules will be produced [hg=208,o=16]

  49. Chemistry - Liquid Methane?

    "The planets Uranus and Neptune are so far from the Sun that temperatures are low enough for atmospheric methane, CH4, to condense and form clouds. How is it possible for methane, a nonpolar substance, to exist in this liquid state?" I want to say it's

  50. Chemistry

    A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of

  51. Language Arts

    Read the excerpt from Wonder. I know I'm not an ordinary ten-year-old kid. I mean, sure, I do ordinary things. I eat ice cream. I ride my bike. I play ball. Stuff like that makes me ordinary. I guess. And I feel ordinary. Inside. But I know ordinary kids

  52. chemical

    The vapor pressure of mercury at 77¢K is 0.0018 mmHg. The atomic weight of mercury is 200.6 g/mole. If the mercury vapor were allowed to reach equilibrium at this temperature in an enclosed space, what would be the mercury vapor concentration in the

  53. Chemistry

    3. A hypothesis is a testable statement.- T 4. Weight is a measure of the quantity of matter.- F 6. Potential energy is energy of motion.- F? 7. Liquids do not have a definite shape or volume.- F 8. The ability to burn is a chemical property.- T 10.

  54. science

    how many half-lives have passed if 87.5% of a substance has decomposed? how many if 99.999% has decomposed?

  55. Chemistry

    It has been proposed that wood alcohol, CH3OH, a relatively inexpensive fuel to produce, be decomposed to produce methane. Methane is a natural gas, commonly used for heating homes. is a decomposition from wood alcohol to methane and oxygen

  56. Chemistry

    Label the following changes as CHEMICAL or PHYSICAL change 1. Fat reacting with sodium hydroxide 2. Chemical A originally is buoyant in water; after it mixed with HCI, the new substance now sinks in water Label the following reactions as exothermic or

  57. chemistry

    Compare the chemical composition of methane and ethanol to carbon dioxide. Which one can be said to be the complete oxidation of glucose? I thought is was methane but I got it wrong can you explain please.

  58. Inference check my answers

    Excerpt from Wonder By J R Palacio I know I’m not an ordinary ten-year-old kid. I mean, sure, I do ordinary things. I eat ice cream. I ride my bike. I play ball. I have an XBox. Stuff like that makes me ordinary kids run away screaming in playgrounds. I

  59. 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

  60. 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

  61. chemisrty

    When a substance changes from one phase to another, which of the following occurs? the substance loses or gains heat the average kenetic energy of the substance changes the temperature of a substance changes the molecular motion of a substance changes

  62. Science

    If you are describing methane as a gas that easily catches fire, you are describing a ____. A. state of matter*** B. physical property C. chemical property D. chemical formula I think it's A

  63. science

    The total energy of motion in the molecules is called POTENTIAL ENERGY. TEMPERATURE is the average amount of energy of motion in the molecules of a substance. A THERMOMETER is a thin glass tube with a bulb on one end that contains a liquid,usually mercury

  64. biology

    Methyl mercury is a toxic substance that can harm the nervous system. Some fish are contaminated with high levels of methyl mercury. In many places, these fish are an important food source. Experiments are being conducted to determine how many meals of

  65. CHEMISTRY: URGENT

    30cm^3 of a mixture of methane and ethane were mixed with 100cm^3 of oxygen at ordinary temperature and pressure and exploded. After cooling the residual gases occupied 61.5cm^3. Find the percentage by volume of each gas in the mixture, methane (CH4) and

  66. chemistry

    Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes, leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 215 ng of mercury / mL, what is

  67. Chemistry

    In the lab, 5.8 L of methane gas is burned with excess oxygen gas at SATP. How much carbon dioxide gas is produced? **Based on the balanced chemical equation the ratio of methane gas to carbon dioxide is 1:1, this being said, does it make sense that as 5.8

  68. physics

    If water rises in a capillary tube 5.8cm above the free surface of the outer liquid what will happen to the mercury level in the same tube when it is placed in the ditch of mercury.calculate the difference in level between the mercury surface inside the

  69. chemistry

    Oops I left a part of the question out: 2. Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes, leading to irreversible inactivity of these enzymes. If the amount of mercury in a

  70. Science

    Plz correct me!! A student combined water, sugar, and salt in a beaker. Which of the following statements is true? (1 point) The individual substances can be separated by physical means. The individual substances cannot be separated by physical means.* A

  71. science, biology

    what evidence shows that the burning of methane is a chemical reaction?

  72. chemistry

    The density of mercury is 13.54 g/cm3. Suppose you need 40 gm of mercury for an experiment. What volume of mercury do you need?

  73. physical sciences

    The density of mercury is 13.54 g/cm3. Suppose you need 40 gm of mercury for an experiment. What volume of mercury do you need?

  74. basic chemistry

    a substance that cannot be broken down into susbtances by ordinary chemical means is

  75. Chemistry

    A mass of 37.5 grams of mercury oxide is decomposed by heating. The reaction is 2HgO > 2Hg + O2. A. How many moles of mercury oxide is decomposed? B. How many moles of oxygen are prepared? C. How many grams of oxygen are prepared?

  76. chemistry

    In a methane fuel cell, the chemical energy of the methane is converted into electrical energy instead of heat that would flow during the combustion of methane. Using the half-reactions and reduction potentials given below a) Write a net equation for the

  77. chemistry

    In a methane fuel cell, the chemical energy of the methane is converted into electrical energy instead of heat that would flow during the combustion of methane. Using the half-reactions and reduction potentials given below a) Write a net equation for the

  78. Chemistry

    An ordinary mercury-in-glass thermometer is calibrated. In the ice water bath, the mercury level is 2.45 cm above the bulb. In boiling water at 1.00 atm pressure the mercury level is 17.75 cm above the bulb. What is the Celsius temperature when the level

  79. chemistry

    In 1774 Joseph Priestly conducted one of his most famous experiments which lead to a method for the preparation of oxygen. The experiment involved heating a sample of mercury II oxide with a large lens. The equation for this reaction is shown below:

  80. English

    Choose the best answer 1. What do you get if you mix common bacteria and vinegar. The word common means a. multiple b. ordinary - the answer c. lower-class d. poisonous 2. It is a serious question. The answer is you get bacteria that eat toxic waste and

  81. Chemistry

    How many half-lives have passed if 87.5% of a substance has decomposed? How many if 99.999% has decomposed? For 87.5% decomposition 1/8 is left. (1/8) = (1/2)^3 Three half lives is the answer Fot 99.999% decomposition, 10^-5 is left. Solve 10^-5 = (1/2)^n

  82. 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

  83. Chemistry

    A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of

  84. Chem please help

    What is the purpose of a calorimeter? A. To determine the temperature of a chemical reaction B. To determine the energy changes of a chemical reaction C. To identify the specific temperature of an unknown substance D. To measure the average kinetic energy

  85. chemistry

    explai9n why methane is a non polar substance. please help

  86. please check

    the meaning of HUMDRUM is a) morose c) exciting b) ordinary d) disruptive my answer: b) ordinary INTERMINABLE most nearly means a) brief c) internal b) fruitful d) endless my answer: d) endless TRIVIAL is best defined as a) minor c) weighty b) important

  87. Biology

    Substance X is converted to substance Y in a chemical reaction. What role would a catalyst play in this scenario? A. It would increase the solubility of substance X into the solvent needed to speed up the reaction. B. It would speed up the reaction by

  88. biology

    Substance X is converted to substance Y in a chemical reaction. What role would a catalyst play in this scenario? A. It would increase the solubility of substance X into the solvent needed to speed up the reaction. B. It would speed up the reaction by

  89. chemistry

    Use chemical formulas to generate the stoichiometric factor needed to express the results of a gravimetric analysis in terms of the substance on the left if the weighting form is the substance on the right: Sought Weighted I Mg Mg2P2O7 II UO2 U3O6

  90. chemistry

    A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. What is the price of one gram of mercury?

  91. Minoxidil

    So, I'm doing a research project for my chemistry class, and one of the parts that I have to answer is the chemical reaction of the substance that I'm researching. But there's a problem. I've searched every single website regarding minoxidil, but I cannot

  92. chemistry

    if you had 120 grams of sugar and all of it decomposed,how many moles of water were decomposed?

  93. chem

    How many atoms of mercury are present in 3.2 cubic centimeters of liquid mercury? The density of mercury is 13.55 g/cc.

  94. chemistry

    If the temperatures of separate 34 g samples of gold, mercury, and carbon are to be raised by 10.0°C. How much heat must be applied to each substance?

  95. Calculus

    A chemical substance is draining from a conical filtering system at a rate of 100 cubic centimeters per minute into a cylindrical storage tank below. The conical filter and cylindrical tank each have a diameter of 60 centimeters, and the height of the cone

  96. Chemistry

    Methane is formed in landfills by the action of certain bacteria on buried organic matter. If a sample of methane collected from a landfill has a volume of 500. mL at 744. torr and 22. °C, how many grams of methane are in the sample?

  97. Chemistry

    Methane is formed in landfills by the action of certain bacteria on buried organic matter. If a sample of methane collected from a landfill has a volume of 200. mL at 741 torr and 27.2 °C, how many grams of methane are in the sample?

  98. chemistry

    Methane is formed in landfills by the action of certain bacteria on buried organic matter. If a sample of methane collected from a landfill has a volume of 100. mL at 754 torr and 21.2 °C, how many grams of methane are in the sample?

  99. science (PLEASE HELP)

    Why is condensation on the beaker resulted from burning methane a chemical reaction?

  100. Physics

    A glass bottle full of mercury has 500g on being heated through 35 degree, 2.43g of mercury are expelled. calculate the mass of mercury remaining in the bottle (cubic expansivity of mercury,=1.8*10"-4) (linear expansivity of glass =8.0*10"-6)

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