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hoa [83]
3 years ago
5

A bus travels 20km in 30 min what is the average speed of the bus

Chemistry
2 answers:
Mamont248 [21]3 years ago
8 0

Answer:

average speed=distance/time

speed=20/30

speed=2/3

STatiana [176]3 years ago
5 0

Answer:

40km/h

Explanation:

v=20km/0.5h=40km/h.

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The rate constant for a certain reaction is k = 5.40×10−3 s−1 . If the initial reactant concentration was 0.100 M, what will the
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Answer : The concentration after 17.0 minutes will be, 4.05\times 10^{-4}M

Explanation :

The expression for first order reaction is:

[C_t]=[C_o]e^{-kt}

where,

[C_t] = concentration at time 't'  (final) = ?

[C_o] = concentration at time '0' (initial) = 0.100 M

k = rate constant = 5.40\times 10^{-3}s^{-1}

t = time = 17.0 min = 1020 s (1 min = 60 s)

Now put all the given values in the above expression, we get:

[C_t]=(0.100)\times e^{-(5.40\times 10^{-3})\times (1020)}

[C_t]=4.05\times 10^{-4}M

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3 years ago
What is wrong with this model of the atom.
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A. The neutrons and electrons are in the wrong place.

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We are told that the forward reaction is exothermic, meaning heat is removed from the reacting substance to the surroundings.

According to Le Chatelier's principle,

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