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laiz [17]
3 years ago
11

A vaccum cleaners has 120j 45j are used how effucent is the cleaner

Chemistry
2 answers:
navik [9.2K]3 years ago
8 0
J=75 HOPE THIS HELPS!
Nostrana [21]3 years ago
5 0
J=75. Because he has already used 45 of his/her 120
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katrin2010 [14]

Answer:

A. releases a large amount of heat

Explanation:

A reaction is said to be spontaneous if it can proceed on its own without the addition of external energy. A spontaneous reaction is not determined by the length of time, because some spontaneous reactions are completed after a long period of time. They are exothermic in nature. An example is the conversion of graphite to carbon which takes a long period of time to complete. Spontaneous reactions are known to increase entropy in a system. Entropy is the rate of disorder in a system.

In the combustion of fire, energy is released to the surroundings as there is a decrease in energy. This is an example of a spontaneous reaction because it is an exothermic reaction, which causes an increase in entropy and a decrease in energy.

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3 years ago
5. What type of clouds can be found in the mesosphere?
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I really hope this helps! I wish you the best of luck!

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2. Which substance will form a solution with water? (Select all that app
cupoosta [38]

Answer:

sugar and salt, as they can dissolve in water. Sugar and salt have a high solubility in water. So, sugar and salt can form a solution with water.

Explanation:

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2 years ago
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Galina-37 [17]

Answer:

C.

Explanation:

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H2O is a compound because its a main constitute of earths hydrosphere

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