posted by .

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 point and boiling point and HOW i can use it to determine when a substance is liquid. Feel free to give me examples.

2. When a substance absorbs heat from its surroundings it could:
A) condense or melt.
B) solidify or condense.
C) evaporate or condense.
D) evaporate or melt.
I'm guessing it is 'evaporate or melt'? Correct me if I am wrong, along with an explanation.

3. When wax melts, the wax particles:
A) change shape to fit the surface they are on.
B) gain energy and spread out alot.
C) become softer.
D) Gain energy and move more freely.
I'm caught between B) and D).. but leaning towards D) more. Again, any explanations would be great!

Thank you very much.

  • Chemistry -

    First, note the correct spelling of celsius.
    It's tough to draw pictures on the board. Here's about the best I can do for #1, oxygen.

    _______25 C room tempeature

    oxygen vapor|
    ............v (I tried to draw an arrow pointing down.)

    _______-183 boiling point


    ________-218 melting point

    Therefore, colder than -218 is solid, between -218 and -183 is liquid, and above -183 is vapor.
    I think if you will draw a diagram something like this for the type question you will always know where you are on the temperature scale.

  • Chemistry -

    2. When a substance ABSORBS heat, it moves UP (from a referencer point BELOW) so a solid could melt, a liquid could vaporize. Your answer is correct.

    3. I don't like any of the answers but your answer is the best listed. There is some truth to A (it does change shape and fits the surface), B(it does gain energy--I don't know about spreading out a lot), C (they do become softer), and D. D is the best overall description and it is general.

  • Chemistry -


  • Chemistry -

    how much energy would be required to change 24.7g of ice to liquid water?the heat of fusion for water is 6.01 kj/mol?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    How much heat is required to vaporize 1.00 L of CCl4 at its normal boiling point?
  2. 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. …
  3. Calculus

    The celcius scale is devised so that 0 degrees celcius is the freezing point of water ( at 1 atmosphere of pressure) and 100 degrees celcius is the boiling point of water ( at 1 atmosphere of pressure) . If you are more familiar with …
  4. 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?
  5. 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 ?
  6. 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 …
  7. 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!! …
  8. Organic chemistry

    A 200.0g sample of glucose(180.16g/mol, Kmp=1.86 degrees celcius/m, mp=146 degrees celcius)is contaminated with 5.000g of table salt, sodium chloride(58.44g/mol, mp=801 degrees celcius). What would the expected melting point of the …
  9. 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?
  10. Chemistry (Urgent)

    Ksp of PbI2 at 25 degrees celcius and 15 degrees celcius is 7.5×10^-8 and 7.5×10^-9 respectively. (Pb=207 I=127) 1) write an expression for the equilibrium of PbI2 2)write an equation for the Ksp of PbI2 3)calculate the solubility …

More Similar Questions