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Schach [20]
3 years ago
6

III. For the following four sections: If you are given the formula, name the

Chemistry
1 answer:
serious [3.7K]3 years ago
5 0

Answer:

15.Potassium oxide

16.Calcium chloride

17.Aluminium sulphide

18.CaS

Explanation:

15.K is the chemical symbol of Potassium and generally the name of the non-metal at the end of a formula has the suffix '-ide' and since O is oxygen, the name becomes Potassium oxide.

16. The same applies here. Ca is Calcium and Cl is Chlorine but since its the non-metal at the end, it ends in -ide. So Calcium chloride.

17.The same applies here too. Al is Aluminium and S is Sulphur so Aluminium sulphide.

18. Calcium's symbol is Ca and that of Sulphur is S and that gives the formula CaS.

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The rate constant for the second-order reaction !s 0. 54 m-1 s-1 at 300°c. how long (in seconds) would 1t take for the concentra
Jlenok [28]

The answer is 3.63. seconds.

Second order reaction is the reaction in which the rate of reaction depends on either the concentration of two reactant species or on the two times the concentration of single reactant species.

What is the integrated rate law for the second-order reaction?

  • The integrated rate law that relates the concentration, time and rate constant for the second-order reaction is:

\frac{1}{[A]} =\frac{1}{[A]_{0} } +kt

Where

\[\begin{array}{l}{\rm{[A]  -  concentration\ of\ reactant\ A\ at\ time\ t}}\\{{\rm{[A]}}_0}{\rm{ -  initial\ concentration\ of\ reactant\ A}}\\{\rm{t - time}}\\{\rm{k  -  rate\ constant}}\end{array}\]

  • Now, in the given question,

k = 0.54 m^{-1}. s^{-1}

[NO_{2} ]= 0.62\ M

[NO_{2} ]_{0} = 0.28\ M

  • Thus, using the rate law, the time is calculated as-

\frac{1}{0.28\ M} =\frac{1}{0.62\ M } +(0.54 m^{-1}.s^{-1})  t\\\\(0.54 m^{-1}.s^{-1})  t= \frac{1}{0.28\ M} -\frac{1}{0.62\ M } = 1.959 \\\\

Therefore,

t =\frac{1.959}{0.54} = 3.63\ seconds

  • Hence, the it would take 3.63 seconds for the concentration of NO_{2} to decrease from 0.62 M to 0.28 M if the reaction is second order.

To learn more about second order reaction visit:

brainly.com/question/17217385

#SPJ4

3 0
1 year ago
Prior to hosting an international soccer match, the local soccer club needs to replace the artifical turf on their field with gr
GuDViN [60]

Answer:

It will cost $68,620.5 to the club to add the grass turf to their field.

Explanation:

length of the field = l = 0.102 km = 0.102 × 1000 m

( 1km = 1000 m)

Width of the field w = 0.069 km = 0.069 × 1000 m

Area of the field , A= l × w

A=0.102\times 1000 m\times 0.069\times 1000 m=7,038 m^2

Cost of grass turfing = 9.75 \$/m^2

Cost of grass turfing on field of 7,038 m^2 :

=7,038 m^2\times 9.75 \$/m^2=\$68,620.5

It will cost $68,620.5 to the club to add the grass turf to their field.

4 0
3 years ago
Thermal energy added to a substance that is not changing state causes the substance’s temperature to
tatyana61 [14]

Answer:

increase

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction. Conductors include metal, steel, aluminum, copper, frying pan, pot, spoon etc.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

Hence, thermal energy added to a substance that is not changing state causes the substance’s temperature to increase because it would absorb energy in the form of heat.

6 0
2 years ago
Determine the enthalpy for this reaction: Al(OH)3(s)+3HCl(g)→AlCl3(s)+3H2O(l)
ivanzaharov [21]
<span>Important information to solve the exercise :
Substance ΔHf (kJ/mol):
HCl(g)= −92.0 </span><span>kJ/mol
Al(OH)3(s)= −1277.0 </span><span><span>kJ/mol
</span> H2O(l)= −285.8 </span><span>kJ/mol
AlCl3(s) =−705.6 </span><span>kJ/mol

</span><span>Al(OH)3(s)+3HCl(g)→AlCl3(s)+3H2O(l)
    reactants                         products

products- reactants:</span><span>

(−705.6) + (3 x −285.8) - ( −1277.0 ) - (3 x −92.0 ) = - 10.0 </span>kJ per mole at 25°C
<span>
</span>






6 0
2 years ago
Which of the following is not part of our solar system?
andreyandreev [35.5K]

Answer:

none of the above

Explanation:

4 0
2 years ago
Read 2 more answers
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