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sweet-ann [11.9K]
4 years ago
15

Which of the following is not an adaptation of California thrashers to life in the chaparral biome? a. a long, curved beak for s

cratching at the ground b. nesting in late March c. a preference for walking over flying d. nocturnal activity Please select the best answer from the choices provided A B C D
Chemistry
2 answers:
dedylja [7]4 years ago
5 0

Answer:

D

Explanation:

Edge 2020

BaLLatris [955]4 years ago
4 0

Answer:

D

Explanation:

i think option D

hope this helps

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Which one of the following properties is NOT a chemical property? (5 points)
telo118 [61]

Answer:

a

Explanation:

Density is a physical property.

8 0
3 years ago
15A.4(a) What is the temperature of a two-level system of energy separation equivalent to 400 cm−1 when the population of the up
maksim [4K]

Answer:

T = 525K    

Explanation:

The temperature of the two-level system can be calculated using the equation of Boltzmann distribution:

\frac{N_{i}}{N} = e^{-\Delta E/kT}  (1)

<em>where Ni: is the number of particles in the state i, N: is the total number of particles, ΔE: is the energy separation between the two levels, k: is the Boltzmann constant, and T: is the temperature of the system </em>         

The energy between the two levels (ΔE) is:

\Delta E = hck    

<em>where h: is the Planck constant, c: is the speed of light and k: is the wavenumber</em>      

\Delta E = 6.63\cdot 10^{-34} J.s \cdot 3\cdot 10^{8}m/s \cdot 4 \cdot 10^{4}m^{-1} = 7.96 \cdot 10^{-21}J  

Solving the equation (1) for T:

T = \frac{-\Delta E}{k \cdot Ln(N_{i}/N)}  

<em>With Ni = N/3 and k = 1.38x10⁻²³ J/K, </em><em>the temperature of the two-level system is:</em><em> </em>

T = \frac{-7.96 \cdot 10^{-21}J}{1.38 \cdot 10^{-23} J/K \cdot Ln(N/3N)} = 525K                                  

I hope it helps you!

3 0
3 years ago
How many grams do 3.6 x10^20 atoms of silicon weigh?
creativ13 [48]
First, we divide the number of atoms of silicon given in the problem above by Avogadro's number 6.6022 x10^23. This will give us the number of moles of silicon. Then, we multiply the number of moles by the molar mass of silicon. 
number of moles = (3.6 x 10^20 atoms/6.022x10^23 atoms) = 5.97x10^-4 moles
Then, multiplying by the molar mass
                  (5.97x10^-4 moles)(28.0855 g/mol) = 0.017 grams
4 0
3 years ago
Which of the following correctly explains how air exerts pressure on us?
juin [17]
The answer is A.

The molecules in the air located.......below.
6 0
3 years ago
Please help me I will give you the brain thing and extra points. 2
oee [108]
I think it’s A but, don’t come at me if I’m wrong. Btw I read over it multiple times so this isn’t a random guess. Good luck tell me if you got it right
7 0
3 years ago
Read 2 more answers
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