Your speed is increased by 5 m/s in 2 seconds, so your acceleration is 5/2=2.5 m/s/s, or 2.5 metres per second squared.
Answer:
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Melting butter is a physical change. The statement that best describes what is happening is that the butter contains a new arrangement of atoms.
The answer is b, because all of the other compounds are covelent
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.
