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baherus [9]
3 years ago
9

Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the followi

ng reactions would be fastest and which would be slowest?(a) Ea = 45kJ/mol; E = -25 kJ/mol(b) Ea = 35kJ/mol; E = -10 kJ/mol(c) Ea = 55kJ/mol; E = 10 kJ/mol
Chemistry
1 answer:
babymother [125]3 years ago
5 0

b is fastest, having the lowest activation energy (35 kJ) and is an exothermic reaction, releasing energy in the form of heat

c is slowest, having the highest activation energy (55 kJ) and is an endothermic reaction, taking in energy from its surroundings

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gtnhenbr [62]

Explanation:

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Physical changes results in the change of the state of the substance which can be reversed.

However, both chemical and physical changes results in change of state of matter and both process results in change in energy.

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3 0
1 year ago
< please help!!! >
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Answer:

n = 0.573mol

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PV = nRT => n = PV/RT

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T = 0°C = 273K

n = (1.5atm)(8.56L)/(0.08206Latm/molK)(273K) = 0.573mol

8 0
3 years ago
Why must a new flu vaccine be manufactured annually?
mafiozo [28]

Answer:

D or A

<em>But I do know...</em>

It's because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them.

7 0
2 years ago
5. A fireplace fire heating a room on a cold day is an example of what type of heat
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I think the answer is C- radiation

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