1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
natta225 [31]
3 years ago
9

describe in general terms an experiment to determine the molal freezing point depression constant kf of water. Assume the availa

bility of deionized water and solid NaNO3
Chemistry
1 answer:
Dvinal [7]3 years ago
6 0
A solution (in this experiment solution of NaNO₃) freezes at a lower temperature than does the pure solvent (deionized water). The higher the solute concentration (sodium nitrate), freezing point depression of the solution will be greater.
Equation describing the change in freezing point: 
ΔT = Kf · b · i.
ΔT - temperature change from pure solvent to solution.
Kf - the molal freezing point depression constant.
b -  molality (moles of solute per kilogram of solvent).
i - Van’t Hoff Factor.
First measure freezing point of pure solvent (deionized water). Than make solutions of NaNO₃ with different molality and measure separately their freezing points. Use equation to calculate Kf.

You might be interested in
Two different compounds are formed by the elements nitrogen and oxygen. The first compound, compound P1, contains 64.17% by mass
xz_007 [3.2K]

Answer:

Explanation:

To solve the problem, we must know the kind of compounds we are dealing with.

For the first compound, P1 and second compound P2:

                                N                       O                         N                     O

Mass percent       64.17                 35.73                  47.23               52.79

Atomic mass          14                      16                         14                    16

Number of

moles            64.17/14            35.73/16            47.23/14    52.79/16      

                            4.58                  2.23                     3.37                  3.30

Simplest

ratio                 4.58/2.23            2.23/2.23             3.37/3.30         3.3/3.3

                              2                           1                             1                        1

                             

P1 compound is N₂O

P2 compound is NO

These are the compounds,

   In N₂O = 28:16

          NO = 14:16

This is the ratio of nitrogen to a fixed mass of oxygen for the two compounds.

7 0
3 years ago
The particles that make up a rock are constantly in motion. However a rock does not visibly vibrate. Why not?
nadya68 [22]
Well, these particles happens to be small, like REALLY small. So microscopically small they aren't picked up or observed my the naked eye. also the vibrations are in an atomic scale which is also VERY tiny This goes for all solids too.
7 0
3 years ago
What is the name of the molecule shown? Will give brainliest if its right.
nadezda [96]

D. Pentane. Pentane has 5 Carbon and 12 Hydrogen, like the molecule shown.

8 0
3 years ago
How many electrons does it take to fill the outer energy level of most atoms
Orlov [11]
Depends on the element it can by up to 3, 8, or maybe 16.
5 0
3 years ago
A gas is at 35.0°c and 3.50 l. what is the temperature at 7.00 l?
Degger [83]

Answer:

363C

Explanation:

V = KT  and T = V/K

3.5=k(35+273) = 308k

k=3.5/308 =0.011

new T=7.0/0.011=636K = 636-273 =363C

4 0
2 years ago
Other questions:
  • Given: 2LiBr + I2 → 2LiI + Br2 Calculate the mass of bromine produced when 9.033 × 1023 particles of iodine (I2) react completel
    8·1 answer
  • Which of the following represents six molecules of water? 6HO 2 6H 2O 1 6H 2O H 6O
    10·2 answers
  • Science question down below
    14·1 answer
  • Which list of radioisotopes contains an alpha emitter, a beta emitter, and a positron emitter?
    15·2 answers
  • Consider the biochemical pathway: A + E1 –> B + E2 –> C (Note that A, B, and C are molecules in the pathway, E1 is enzyme
    12·1 answer
  • When exchanging information<br><br> with anyone involved in the<br><br> collision, you should
    13·1 answer
  • What is the volume in milliliters of 7.26 g of acetone? (Acetone has a density of 0.7857 g/cm^3)
    5·2 answers
  • Viscous a chemical or physical property
    7·1 answer
  • In order to determine if 2 atoms are cooper what must be the same for each
    13·1 answer
  • A chemistry student needs 30.0 g of acetic acid for an experiment. He has available 1.2 kg of a 7.58% w/w solution of acetic aci
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!