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Degger [83]
3 years ago
13

Why do you think elements must be heated before they emit colored light?

Chemistry
1 answer:
Mademuasel [1]3 years ago
4 0
The colored light emitted is energy and in order to emit energy the element should first obtain energy. The energy absorbed by the substance can be in the form of radiation, heat or electricity. Hope this answers the question. Have a nice day.
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Xas shown in table 15.2, kp for the equilibrium n21g2 + 3 h21g2 δ 2 nh31g2 is 4.51 * 10-5 at 450 °c. for each of the mixtures li
Agata [3.3K]
According to the balanced equation of this reaction:
N2(g) + 3H2(g) ↔ 2NH3(g)
and when we have Kp = 4.51 x 10^-5 so, in the Kp equation we will substitute by the value of the P for each gas to compare the value with Kp = 4.51x10^-5

a) when we have 98 atm NH3, 45 atm N2, 55 atm H2 by substitution in Kp equation:
Kp= [p(NH3)]^2 / [p(N2)]*[p(H2)]^3 = [98]^2 / [45]*[55]^3
                                                        = 1.28x10^-3 
So here the value is higher than the value of the given Kp.
so the reaction will go leftwards toward the reactants ( to reduce the value of Kp) to reach the equilibrium. 
b) When 57 atm NH3, 143 atm N2, No H2 so like a) by substitution:
Kp = [57]^2 / [143] = 22.7
So the reaction will go leftwards toward the reactants to reduce the value of Kp to reach equilibrium.
c) when 13 atm NH3, 27 atm N2, 82 H2
Kp = [13]^2 / [27]*[82]^3 = 1.135 x 10^-5 So this value is lower than the Kp which is given.
 so, the reaction will go towards the right toward the products to increase the value of Kp to reach the equilibrium.  
8 0
3 years ago
How much copper is present in a cube that measures 3.20cm on each side, if the density of copper is 8.96 g/mL
Ainat [17]

Answer:

290.32 g

Explanation:

First we <u>calculate the volume</u> of the cube:

  • Volume = (3.20 cm)³ = 32.768 cm³

Now we <u>convert cubic centimeters to mililiters</u>:

  • 32.768 cm³ * 1 mL / 1 cm³ = 32.768 mL

Finally we <u>calculate the mass</u>, using the <em>equation for density</em>:

  • Density = mass / Volume
  • mass = Density * Volume
  • mass = 8.86 g/mL * 32.768 mL = 290.32 g
7 0
3 years ago
The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium h
7nadin3 [17]

Answer:  

0.022 M

Explanation:

The molarity is the number of mol solute divided by the volume of solution in liters. Since we are told there is only one acidic hydrogen in KHP  the reaction is a 1 to 1 with sodium hydroxide, We then calculate the moles of sodium hydroxide required to react with the  moles of KHP and proceed to calculate the molarity of the NaOH solution:

mol KHP:  0.1082 g  x  1 mol/204.22 g = 0.00053 mol KHP

0.00053 mol KHP x 1 mol Naoh/1 mol KHP = 0.00053 mol NaOH

Molarity of the solution :  0.00053 mol NaOH / 0.02346 L = 0.022 M

note: The volume of sodium hydroxide needed to be converted to liters by definition of molarity.

4 0
3 years ago
Plz help me out with this <br>10 points ​
grin007 [14]

Answer:

you can tell diorite is an intrusive igneous rock because it has a coarse-grained texture

6 0
3 years ago
Read 2 more answers
Balance the following equation<br>Al + O₂ - ALO₃​
baherus [9]

Answer:

2Al + 3O₂ ===> 2ALO₃

Explanation:

2Al + 3O₂ ===> 2ALO₃

6 0
4 years ago
Read 2 more answers
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