An organic molecule is likely to contain all of these elements except: Answer C H O Ne N

Which are always the first waves of an earthquake to be detected

Marrrta [24]

p waves (primary waves)

the fastest and can travel through solids, liquids, or gasses

8 0

3 years ago

Choose all the answers that apply.

g100num [7]

The cell membrane is made up of phospholipids, embedded with proteins, and controls the transfer of materials into and out of the cell.

3 0

3 years ago

Read 2 more answers

A student prepared an equilibrium solution by mixing the following solutions:A.2.00 mL of 0.00250 M Fe(NO3)3B.5.00 mL of 0.00250

Crank

Explanation:

$Molarity=\frac{\text{Moles of solute}}{\text{Volume of solution Liter}}$

A. 2.00 mL of 0.00250 M $Fe(NO_3)_3$

Moles of ferric nitrate = n

Volume of ferric nitrate = 2.00 ml = 0.002 L ( 1 mL=0.001 L)

Molarity of ferric nitrate = 0.00250 M

$n=0.00250 M\times 0.002 L=0.000005 mol$

B. 5.00 mL of 0.00250 M $KSCN$

Moles of KSCN = n'

Volume of KSCN = 5.00 ml = 0.005 L ( 1 mL=0.001 L)

Molarity of KSCN = 0.00250 M

$n'=0.00250 M\times 0.005 L=0.0000125 mol$

C. 3.00 mL of 0.050 M $HNO_3$

Moles of nitric acid = n''

Volume of nitric acid = 3.00 ml = 0.003 L ( 1 mL=0.001 L)

Molarity of nitric acid = 0.050 M

$n=0.050 M\times 0.003 L=0.00015 mol$

After mixing A, B and C together and their respective initial concentration before reaction.

After mixing A, B and C together the volume of the solution becomes = V

V = 0.002 L=0.005 L+0.003 L= 0.010 L

Concentration of ferric nitrate :

$[Fe(NO_3)_3]=\frac{0.000005 mol}{0.010 L}=0.0005 M$

Concentration of ferric ions :

$[Fe^{3+}]=1\times [Fe(NO_3)_3]=0.0005 M$

Concentration of nitrate ions from ferric nitrate:

$[NO_3^{-}]=3\times [Fe(NO_3)_3]=0.0015 M$

Concentration of KSCN :

$[KSCN]=\frac{0.0000125 mol}{0.010 L}=0.00125 M$

Concentration of $SCN^-$ ions:

$[SCN^-]=1\times [KSCN]=0.00125 M$

Concentration of potassium ions:

$[K^+]=1\times [KSCN]=0.00125 M$

Concentration of nitric acid :

$[HNO_3]=\frac{0.00015 mol}{0.010 L}=0.015 M$

Concentration of hydrogen ion :

$[H^+]=1\times [HNO_3]=0.015 M$

Concentration of nitrate ions from nitric acid :

$[NO_3^{-}]=1\times [HNO_3]=0.0015 M$

Concentration of nitrate ion in mixture = 0.0015 M + 0.0015 M = 0.0030 M

$Fe^{3+}+SCN^-\rightleftharpoons Fe(NCS)^{2+}$

given concentration of $Fe(NCS)^{2+}$ at equilbrium = $3.6\times 10^{-5} M = 0.000036 M$

initially :

0.0005 M 0.00125 M 0

At equilibrium

(0.0005-0.000036) M (0.00125-0.000036) M 0.000036 M

0.000464 M 0.001214 M 0.000036 M

The expression of an equilibrium constant will be given as;

$K_c=\frac{[Fe(NCS)^{2+}]}{[Fe^{3+}][SCN^{-}]}$

$=\frac{0.000036 M}{0.000464 M\times 0.001214 M}=63.91$

The value for the equilibrium constant is 63.91.

6 0

3 years ago

Which of the following statements about nuclear reactions is true?

Anit [1.1K]

Answer: They follow Einstein's equation, which allows for the conversion of mass to energy.

The statement that is true about nuclear reactions is that they follow Einsteins equation which allows the conversion of mass to energy.

Explanation:

Einstein’s mass-energy equation gives the idea that energy and mass are two inter-convertible forms of the same thing. This equation clearly answers the question about the large amount of energy produced by produced in nuclear reaction even though they don’t involve very heavy atoms. It is given by

$E=mc^2$

Energy released by a mass is equal to mass times the square of speed of light c. 

Value of speed of light $c=3 \times 10^8 .$ 

 $c^2=9 \times 10^1^6$ which is a large value.

Thus high amount of energy can be produced by even a small mass. It is the mass of the reacting species in a nuclear reaction that gets converted to energy and the sum of mass and energy in the overall reaction is always conserved. 

3 0

4 years ago

Electrophiles for the electrophilic aromatic substitution reactions have to be very strong to react with the stable aromatic rin

Leokris [45]

Answer: The nitronium ion is a strong electrophile

Explanation:

The detailed mechanism of the reaction is shown in the images attached. The flow of electrons has been shown with arrows. HNO3 is first protonated by H2SO4 this protonated specie H2NO3+ now forms H2O and NO2+.

3 0

4 years ago