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
Pepsi [2]
4 years ago
15

Urea is a common fertilizer with the formula CO(NH2)2 that is sometimes used as a chemical de-icer for icy road surfaces in the

winter months. Adding a solute to a solvent causes the freezing point to be lowered and allows the solvent to remain liquid at lower temperatures. The value of Kf for water is 1.86°C/m, and its normal freezing point is 0.00°C. Urea is a nonvolatile nonelectrolyte solute. What molality of urea is required to lower the freezing point of ice water by 1.13°C?
Chemistry
1 answer:
nordsb [41]4 years ago
4 0

Answer:

The answer to your question is  molality = 0.61

Explanation:

Freezing point is the temperature at which a liquid turns into a solid if a solute is added to a solution, the freezing point changes.

Data

Kf = 1.86 °C/m

molality = ?

ΔTc = 1.13°C

Formula

ΔTc = kcm

Solve for m

m = ΔTc/kc

Substitution

m = 1.13 / 1.86

Simplification and result

m = 0.61

You might be interested in
During a phase change, the temperature of a substance _____.
adell [148]

Answer: remains constant.


Justification:


1) The phase changes are:


i) Boiling: pass from liquid to gas (absorbs heat energy)

ii) Condensation: pass from gas to liquid (release heat energy)

iii) Melting: pass from solid to liquid (absorb heat energy)

iv) Freezing: pass from liquid to solid (release heat energy)

v) Sublimation: pass from solid to gas (absorbs heat energy)

vii) Deposition: pass from gas to solid (release heat energy)


2) When a phase change occurs, whichever it is, the heat energy related with the process, either absortion or release, is used, to overcome the intermolecular forces (in the case of heat energy absortion) or to create stronger intermolecular forces (in the case of heat energy release).


Because of that, the heat energy exchange does not change the temperature of the substance.

8 0
3 years ago
Read 2 more answers
What does a base release when it is placed in water?
Alexxx [7]

Answer:

D - Hydroxide Ion (OH-)

Explanation:

A base provides either hydroxide ions (OH–) or other negatively charged ions that combine with hydrogen ions, reducing their concentration in the solution and thereby raising the pH. In cases where the base releases hydroxide ions, these ions bind to free hydrogen ions, generating new water molecules.

3 0
3 years ago
Science-DNA Codes. Fill out the chart.
MissTica

Answer: (not sure)

T - A  

T - A

T - A

A - T

C - G

G - C

C - G

C - G

A - T

im not sure about the amoni acid produced but

AAA produces -> Lys.

ACG produces -> Thr.

and i don't know about the last one

7 0
3 years ago
Read 2 more answers
Drag the labels onto the table to indicate which type(s of gated ion channels are found in each membrane associated with a chemi
dsp73

According to a source, the most probable answer to this query is that chemical synapses makes use of these gated ion channels to transfer neurotransmitter for cell signaling. Thank you for your question. Please don't hesitate to ask in Brainly your queries. 
3 0
3 years ago
Which of these counts as a single electron domain?
Schach [20]

Answer:

double bond to an atom

a lone pair

a single bond to an atom

Explanation:

3 0
3 years ago
Other questions:
  • If 75 g of metal at 100.0∘C is transferred into 80.0 mL of water at 20.0∘C initially. The water is then raised to 25∘C. What is
    15·1 answer
  • The specific heat capacity of aluminum is 0.215 cal/g°
    10·1 answer
  • I’m so confused on this one!
    14·1 answer
  • Calculate the vapor pressure at 25° C of a
    10·1 answer
  • Will give brainliest for first answer pls help!!!!
    14·2 answers
  • What does the word atomos mean and why is it not an accurate name
    12·1 answer
  • Movement of the ___<br> creates the London dispersion forces.
    13·1 answer
  • PLEASE HELP WILL GIVE BRAINLIEST
    6·1 answer
  • In the ground state an atom of which element has seven valence electrons.
    11·1 answer
  • The picture shows two containers filled with a gas.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!