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son4ous [18]
3 years ago
14

Pleaseeee help me only 29 and 30

Chemistry
1 answer:
stepladder [879]3 years ago
3 0

Answer:

29: a. unbalanced

b. unbalanced

c. unbalanced

30. a. coefficient b. subscript c. formula unit d. element e. reactant f. product

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In Niels Bhor's model of the atom, electrons move
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Bohrs model says that electrons move in fixed shells (which have fixed distances) around the nucleus of an atom. 
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A study of the decomposition reaction 3RS2  3R + 6S yields the following initial rate dat
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Missing question: What is the rate constant for the reaction?
<span>[RS2](mol L-1) Rate (mol/(L·s))
0.150                0.0394
0.250                0.109
0.350                0.214
0.500                0.438</span>
Chemical reaction: 3RS₂ → 3R + 6S.
Compare second and fourth experiment, when concentration is doubled, rate of concentration is increaced by four. So rate is:
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3 years ago
Calculate the final Celsius temperature when 634 L at 21 °C is compressed to 307 L.
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Answer:

- 130.64°C.

Explanation:

  • We can use the general law of ideal gas:<em> PV = nRT.</em>

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

  • If n and P are constant, and have two different values of V and T:

<em>V₁T₂ = V₂T₁</em>

<em></em>

V₁ = 634.0 L, T₁ = 21.0°C + 273 = 294.0 K.

V₂ = 307.0 L, T₂ = ??? K.

<em>∴ T₂ = V₂T₁/V₁ </em>= (307.0 L)(294.0 K)/(634.0 L) = <em>142.36 K.</em>

<em>∴ T₂(°C) = 142.36 K - 273 = - 130.64°C.</em>

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3 years ago
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Answer:

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Explanation:    

Ammonia is a hydride of nitrogen with the chemical formula NH₃. It is a colorless gas with a characteristic pungent smell. According to the VSEPR theory, it has a trigonal pyramidal structure.  

In water, ammonia acts as a Lewis base due to the presence of lone pair on the nitrogen atom. Lewis bases are electron pair or lone pair donors.      

8 0
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Which 3 elements had complete out shells? (you will probably need to use the periodic table)
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The inert gases like neon,argon ,krypton have complete shells
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