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
hram777 [196]
3 years ago
10

A food web is

Chemistry
1 answer:
Allushta [10]3 years ago
8 0
A food web is a graphic representation of all possible energy pathways through an ecosystem.
You might be interested in
Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure of 1000 kPa by an internally reversible compress
ElenaW [278]

Answer:

(a) W_{isoentropic}=8.125\frac{kJ}{mol}

(b) W_{polytropic}=7.579\frac{kJ}{mol}

(c) W_{isothermal}=5.743\frac{kJ}{mol}

Explanation:

Hello,

(a) In this case, since entropy remains unchanged, the constant k should be computed for air as an ideal gas by:

\frac{R}{Cp_{air}}=1-\frac{1}{k}  \\\\\frac{8.314}{29.11} =1-\frac{1}{k}\\

0.2856=1-\frac{1}{k}\\\\k=1.4

Next, we compute the final temperature:

T_2=T_1(\frac{p_2}{p_1} )^{1-1/k}=300K(\frac{1000kPa}{100kPa} )^{1-1/1.4}=579.21K

Thus, the work is computed by:

W_{isoentropic}=\frac{kR(T_2-T_1)}{k-1} =\frac{1.4*8.314\frac{J}{mol*K}(579.21K-300K)}{1.4-1}\\\\W_{isoentropic}=8.125\frac{kJ}{mol}

(b) In this case, since n is given, we compute the final temperature as well:

T_2=T_1(\frac{p_2}{p_1} )^{1-1/n}=300K(\frac{1000kPa}{100kPa} )^{1-1/1.3}=510.38K

And the isentropic work:

W_{polytropic}=\frac{nR(T_2-T_1)}{n-1} =\frac{1.3*8.314\frac{J}{mol*K}(510.38-300K)}{1.3-1}\\\\W_{polytropic}=7.579\frac{kJ}{mol}

(c) Finally, for isothermal, final temperature is not required as it could be computed as:

W_{isothermal}=RTln(\frac{p_2}{p_1} )=8.314\frac{J}{mol*K}*300K*ln(\frac{1000kPa}{100kPa} ) \\\\W_{isothermal}=5.743\frac{kJ}{mol}

Regards.

8 0
3 years ago
Which element ends in 4d2
Tju [1.3M]

Answer:

Zr (Zirconium)

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2

3 0
2 years ago
In liquids, the attractive intermolecular forces are ________. In liquids, the attractive intermolecular forces are ________. st
Fantom [35]

Answer:

strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other.

Explanation:

In liquids, the attractive intermolecular forces are <u>strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other</u>.

Intermolecular forces are the forces of repulsion or attraction.

Intermolecular forces lie between atoms, molecules, or ions. Intramolecular forces are strong in comparison to these forces.

<u />

5 0
2 years ago
Which element forms an ionic bond when combined with Cl
Shtirlitz [24]
Potassium or any other metals.
3 0
3 years ago
30. How many types of chemical reactions are there?
Nadusha1986 [10]

Answer:

B. Five

Hope this helps........

8 0
3 years ago
Read 2 more answers
Other questions:
  • How many grams of silver chloride can be prepared by the reaction of 105.0 ml of 0.22 m silver nitrate with 105.0 ml of 0.13 m c
    9·1 answer
  • A 64.4-g sample of potassium chloride was added to 200.0 g of water at 20 degrees C. Is the solution saturated, unsaturated, or
    8·1 answer
  • Do you think sodium carbonate is an acid or base?
    15·1 answer
  • In a reaction 4 NH3 + 5 O2 → 4 NO + 6 H2O, 1 mole of ammonia reacts with 2 moles of oxygen. Which of these is correct after the
    12·1 answer
  • Plz help me.. plzzzzzzzz
    8·1 answer
  • The systematic names for water, ammonia, and methane are dihydrogen monoxide, H2O; trihydrogen nitride, NH3; and tetrahydrogen c
    7·1 answer
  • What is the mass of HCl that would be required to completely react with 5.2 grams of Mg
    13·2 answers
  • 2. You have a rock with a<br> volume of 15cm3 and a<br> mass of 45 g. What is its<br> density?
    11·1 answer
  • Which choice describes an organism found in the under story of a rain forest?
    15·1 answer
  • Which quantity is held constant for Boyle's law, Gay-Lussac's law, and Charles's law?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!