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
Sonbull [250]
3 years ago
11

The surface tension of water is 7.28 ✕ 10−2 J/m2 at 20°C. Predict whether the surface tension of heptane would be higher or lowe

r than that of water at the same temperature. Explain your answer.

Chemistry
1 answer:
stira [4]3 years ago
3 0

Answer:

Lower  

Explanation:

Surface tension occurs because molecules at the surface do not have molecules above them, so they cohere more strongly to their neighbours.

The stronger cohesive forces make it more difficult to move an object through the surface than when it is beneath the surface.

The attractive forces in water are strong because of hydrogen bonding.

A hexane molecule is nonpolar, so the only attractions are the weak London dispersion forces.

The cohesive forces at the surface are much lower than those in water, so the surface tension of hexane is lower than that of water at the sane temperature.

You might be interested in
Which of the following do scientists use to form a hypothesis?
Debora [2.8K]

Explanation:

The scientific method involves making observations and asking questions. Scientists form hypotheses based on these observations and then develop controlled experiments to collecting and analyze data. Using this data, they are able to draw conclusions and form questions for new scientific research.

:)ᴍᴀʀᴋ ᴀꜱ ʙʀᴀɪɴʟɪꜱᴛ

3 0
2 years ago
Cuántos moles hay en 17.5 gramod de ZnCl2​
Aliun [14]

Explanation:

Zn=65

Cl2= 35+35=70

65+70=135g

1 mole ZnCl2 = 135g

x mole = 17.5g

17.5g × 1 mole/ 135g= 0.129 moles en 17.5g de ZnCl2

4 0
3 years ago
What is the molarity of a solution of 4.50 g
Andrews [41]

Answer:

M = 0.23 M

Explanation:

Given data:

Molarity of solution = ?

Mass of NH₄Br = 4.50 g

Volume of solution = 213 mL (213 mL× 1L /1000 mL = 0.213 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Number of moles of NH₄Br:

Number of moles = mass/molar mass

Number of moles = 4.50 g / 97.94 g/mol

Number of moles = 0.05 mol

Molarity:

M = 0.05 mol/ 0.213 L

M = 0.23 M

7 0
2 years ago
How many moles of oxygen react with 0.23 moles of NH3
Elina [12.6K]
0.025 is how many moles of oxygen to react with NH3
                                                 
4 0
3 years ago
Read 2 more answers
Help me please (~ ̄. ̄)~​
Stels [109]
4) All Are correct. :P
6 0
2 years ago
Read 2 more answers
Other questions:
  • Roberto examines two molecular models. He sees that the atoms are the same in each model and are attached in the same order in e
    11·2 answers
  • Some people consider the earth to be _____ because of its dynamic processes or cycles.
    7·2 answers
  • Given a molecular formula, how would you calculate the molecular weight of a compound
    7·1 answer
  • 25. Which of the following statements is true for
    9·1 answer
  • Tidal power plants work best in small estuaries or intels that border the ocean. True or false?
    10·1 answer
  • What gases occur in the same percentages throughout the layers of the atmosphere?
    9·1 answer
  • For which of the following molecules or ions does the following description apply? "The bonding can be explained using a set of
    12·2 answers
  • Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about
    13·1 answer
  • Which describes the boundary where earthquake activity occurs along rift valleys? divergent boundary in the ocean divergent boun
    11·2 answers
  • FREE POINTS<br><br> DONT FORGET TO GIVE A HEART ON MY ACCOUNT HELPS
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!