• Freezing Point?

    A student uses a home freezer in an experiment to find the freezing point of rubbing alcohol. The temperature plateaus at -10 degrees celsius but the alcohol does not freeze. How can you explain this result?
    A student uses a home freezer in an experiment to find the freezing point of rubbing alcohol. The temperature plateaus at -10 degrees celsius but the alcohol does not freeze. How can you explain this result?
    4 answers · 5 days ago
  • Chemistry Question?

    Best answer: You are taking chem and can't do simple math?

    this is just proportions.

    35.0 g nitrogen, 5.05 g hydrogen, and 60.0 g of oxygen. How many grams of nitrogen are there in a 191-g sample

    35+5.05+60 = 100.05 g

    35/100.05 = x/191
    x = 35•191/100.05 = 66.8 g
    Best answer: You are taking chem and can't do simple math?

    this is just proportions.

    35.0 g nitrogen, 5.05 g hydrogen, and 60.0 g of oxygen. How many grams of nitrogen are there in a 191-g sample

    35+5.05+60 = 100.05 g

    35/100.05 = x/191
    x = 35•191/100.05 = 66.8 g
    4 answers · 5 days ago
  • Chemistry help!?

    The accepted SI unit for energy is the____ , but another common unit is the____ .
    The accepted SI unit for energy is the____ , but another common unit is the____ .
    4 answers · 1 week ago
  • What size is indigo?

    4 answers · 1 week ago
  • What is the answer to this problem with the correct number of significant figures? (9427+55−7.5)×(7.8×10^6)?

    I got 73901.1 x 10^6 and it says i m close. Then I typed in 7.4 x 10^6 but it says that s wrong also, what am I doing wrong?
    I got 73901.1 x 10^6 and it says i m close. Then I typed in 7.4 x 10^6 but it says that s wrong also, what am I doing wrong?
    6 answers · 2 weeks ago
  • How to become good in chemistry?

    I suck at chemistry and I want to be good at it so I can study in America but how do I become good? Right now I’m learning about moles but I can’t do the math it’s too hard or I don’t understand. So how do I become good? At chemistry
    I suck at chemistry and I want to be good at it so I can study in America but how do I become good? Right now I’m learning about moles but I can’t do the math it’s too hard or I don’t understand. So how do I become good? At chemistry
    7 answers · 2 weeks ago
  • Which of the following statements is false? Why?

    Best answer: True/false a). Solutions are always homogeneous mixtures. ... TRUE .... That's the definition of a solution. It is a homogeneous mixture b). The terms “atom” and “element” can have different meanings. ... TRUE .... Atoms are the particles of elements, whereas an element is one of the unique, naturally... show more
    Best answer: True/false

    a). Solutions are always homogeneous mixtures. ... TRUE
    .... That's the definition of a solution. It is a homogeneous mixture
    b). The terms “atom” and “element” can have different meanings. ... TRUE
    .... Atoms are the particles of elements, whereas an element is one of the unique, naturally occurring "building blocks" of compounds.
    c). Elements can exist as atoms or molecules. .... TRUE
    .... There are the common diatomic elements: H2, N2, O2, F2, Cl2, Br2, I2 plus P4 and S8, and the list keeps going.
    d). Compounds can exist as atoms or molecules. .... FALSE
    .... You can't have an atom of a compound. The smallest particle of a compound is a molecule.
    e). At least two of the above statements (A-D) are false .... FALSE
    ..... There's only one which is false.
    4 answers · 1 week ago
  • Which of the following is decomposition reactions?

    Best answer: Reaction types..... What you really need to know is how to identify all of the basic reaction types. Each has a distinctive format that makes it easy. 1. synthesis (combination) .... only one product 2. decomposition .... only one reactant 3. single replacement .... element + compound --> element + compound 4.... show more
    Best answer: Reaction types.....

    What you really need to know is how to identify all of the basic reaction types. Each has a distinctive format that makes it easy.
    1. synthesis (combination) .... only one product
    2. decomposition .... only one reactant
    3. single replacement .... element + compound --> element + compound
    4. double replacement .... two compounds on each side, where (a) there is the formation of a precipitate, or (b) there is an acid/base reaction (usually a simple Arrhenius A/B reaction).
    5. complete combustion of a hydrocarbon .... hydrocarbon burns in O2 to make CO2 and H2O

    Of your choices, only (D) has a single reactant, and it is the decomposition reaction. Just because some are balanced, doesn't help you identify the reaction type.

    You can find general descriptions of these at my website, along with a sample worksheet.
    https://c7chemistry.wikispaces.com/file/...
    https://c7chemistry.wikispaces.com/file/...
    4 answers · 1 week ago
  • What is mass?

    4 answers · 1 week ago
  • Calculate the kinetic energy of a 116. mg raindrop moving at a speed of 6.9 m/s. Round your answer to 2 significant digits. ?J?

    Best answer: KE = 1/2 * m * speed^2

    To get the energy in J, you want the mass in kg and the speed in m/sec.

    0.0028 J
    Best answer: KE = 1/2 * m * speed^2

    To get the energy in J, you want the mass in kg and the speed in m/sec.

    0.0028 J
    4 answers · 1 week ago
  • Calculate the pressure exerted by 1.00 mol of CO2 in a 1.00 L vessel at 300 K, assuming that the gas behaves ideally.?

    Best answer: Your teacher is an idiot. "Assuming the gas behaves ideally" would mean NOT using the Van der Waals equation! The Van der Waals equation accounts for some of the departures from ideal behavior. Oh well, sorry you have to be taught by a moron. Anyway, the Van der Waals equation says [p + a(n/V)^2]*(V/n... show more
    Best answer: Your teacher is an idiot. "Assuming the gas behaves ideally" would mean NOT using the Van der Waals equation! The Van der Waals equation accounts for some of the departures from ideal behavior. Oh well, sorry you have to be taught by a moron.

    Anyway, the Van der Waals equation says
    [p + a(n/V)^2]*(V/n - b) = RT,
    and one must first look up the "a" and "b" for the particular gas.
    Internet says a and b for CO2 are 3.592 L^2-atm/mol^2 and 0.04267 L/mol.
    So you have
    [p + (3.592)(1.00/1.00)^2 atm] * (1.00/1.00 - 0.04267) L/mol = (0.08206 L atm/molK)(300K) =>
    (p + 3.592 atm)(0.95733) = (0.08206 atm)(300) =>
    (p + 3.592 atm) = (25.715 atm) => p = 22.1 atm.

    To see that this APPROXIMATELY makes sense, consider that 1 mole of ideal gas occupies 22.4 liters at STP. So if the gas is confined to 1 liter, the pressure should be about 22 atmospheres! (The departure from ideal gas behavior is not a whole lot.)
    4 answers · 2 weeks ago
  • Chemistry question?

    which of the following pairs is related by an inverse relationship? a. pressure and temperature b. volume and pressure c. temperature and volume d. moles and volume
    which of the following pairs is related by an inverse relationship? a. pressure and temperature b. volume and pressure c. temperature and volume d. moles and volume
    5 answers · 2 weeks ago
  • What is a CBC/Chemistry ?

    4 answers · 2 weeks ago
  • Radioactive Radon-222 gas (222Rn) occurs naturally as a product of uranium decay. The half-life of 222Rn is 3.8 days.?

    Suppose a flask originally contained 8.0×1013 atoms of 222Rn. How many atoms of 222Rn will remain after one month (30. days)?
    Suppose a flask originally contained 8.0×1013 atoms of 222Rn. How many atoms of 222Rn will remain after one month (30. days)?
    4 answers · 2 weeks ago