Which of the following is not a specific adaptation?

Which best describes a punnett square that is used to make predictions about one trait?

FromTheMoon [43]

The description that you are probably looking for is a Monohybrid Cross.

4 0

4 years ago

A line in the Brackett series of hydrogen has a wavelength of 1945 nm. From what state did the electron originate?

fiasKO [112]

Rydberg Eqn is given as:
1/λ = R [1/n1^2 - 1/n2^2]
Where λ is the wavelength of the light; 2626 nm = 2.626×10^-6 m 
R is the Rydberg constant: R = 1.09737×10^7 m-1 
From Brackett series n1 = 4 
Hence 1/(2.626×10^-6 ) = 1.09737× 10^7 [1/4^2 – 1/n2^2] 
Some rearranging and collecting up terms: 
1 = (2.626×10^-6)×(1.09737× 10^7)[1/16 -1/n2^2] 
1= 28.82[1/16 – 1/n2^2] 
28.82/n^2 = 1.8011 – 1 = 0.8011 
n^2 = 28.82/0.8011 = 35.98 
n = √(35.98) = 6

4 0

3 years ago

Read 2 more answers

How many moles are in 2.22 g of NaF

Tanzania [10]

2.22 g of NaF*1mol/41.97g of NaF =0.0529 moles

7 0

4 years ago

Find the enthalpy of neutralization of HCl and NaOH. 87 cm3 of 1.6 mol dm-3 hydrochloric acid was neutralized by 87 cm3 of 1.6 m

olga nikolaevna [1]

Explanation:

The reaction equation for the given reaction will be as follows.

$HCl + NaOH \rightarrow NaCl + H_{2}O$

Each mole of both HCl and NaOH gives one mole of water.

Also, it is given that 1 liter of NaOH and HCl solution contains 1.6 mol $dm^{-3}$ of NaOH (HCl).

It is known that 1 $cm^{3}$ = 0.001 liter. So, 87 $cm^{3}$ = 0.087 liter.

Hence, number of moles of water obtained from the given reaction are as follows.

0.087 liter × 1.6 mol = 0.1392 moles

No. of moles = $\frac{mass}{molar mass of water}$

0.1392 moles = $\frac{mass}{18 g/mol}$

mass = 2.5056 g

Now, volume of water present before the reaction is $2 \times 0.087$ liter = 0.174 liter or 0.174 Kg (as density is 1 $Kg/cm^{3}$ ) or 174 g (as 1 kg = 1000 g).