Why is respiration an exothermic reaction? A. a large amount of energy is released into its surroundings B. the heat content, q, of the reaction is positive C. a large amount of energy is required to activate the reaction D. there is no exchange of energy between the system and the surrounding
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During the respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as as carbon-dioxide and water.
The overall reaction is
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
The reaction is exothermic reaction because C=O and O-H bonds in the products are so much more stable than the bonds in the reactants.
Bond energy is the average needed to break a bond.
Some bond energies are:
C-C = 347 kJ/mol
C-H = 413kJ/mol;
C-O = 358 kJ/mol;
O-H = 467 kJ/mol;
O=O = 495 kJ/mol;
C=O = 799 kJ/mol
Final answer:
Respiration is an exothermic reaction because it releases more energy than it absorbs in the form of heat to its surroundings. All such reactions require an initial energy input, known as 'activation energy', to start the reaction. In an exothermic reaction, the heat content 'q' is negative, showing the transfer of thermal energy from the system to its surroundings.
Explanation:
Respiration is an "exothermic reaction", which means it is a chemical reaction that releases energy in the form of heat to its surroundings. This is achieved through the catabolism of foods in your energy bar, which is an example of an exergonic reaction. This reaction absorbs some of the chemical energy stored in the food, turns it into molecules your body can use, and releases the excess energy into the surroundings. However, all chemical reactions, including exothermic and endothermic reactions, require a small amount of energy to activate them.
During an exothermic reaction, there is a net release of energy despite this initial energy input. The energy given off is more than the energy absorbed. This process represents the concept of 'activation energy', an energy barrier that needs to be overcome for the reaction to proceed. Therefore, the heat content, often represented as 'q', is negative in an exothermic reaction, indicating that the system gives off thermal energy to the surroundings, making the surrounding environment warmer.
Learn more about Exothermic Reactions here:
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Answer : Acceleration will be
Explanation : For finding the acceleration one can use Newton's second law of motion and the formula is;
F = m . a
Where, F - Force;
m - mass of the object
a - acceleration.
We can rearrange the equation to find the acceleration;
a = F/m;
Given F - 25 N and m - 0.3 kg
Hence, a = 25 / 0.3 =
Therefore, when the 0.3 kg ball is hit with a force of 25 N then the acceleration will be .
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Answer:
its acceleration must be 0.
Explanation:
According the second Newton's law, the net force applied in a object is equal to the mass of the object multiplied by its acceleration:
In this case, the net force is
What makes sense since both forces have the same value and opposite directions.
Since the mass of the object can't be zero, the acceleration is the one that must be 0 in order fulfill the equation of the second newton's law.
Another option is that, since both forces are opposite, the wheelbarrow could be at rest. Though this is correct, this is not always true.
In conclusion, the only statement that always is true about the wheelbarrow's motion is that its acceleration must be 0.
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In air
The speed of sound is slowest in air because sound depends on the medium it goes through and it is made from the vibrations passed on by particles in the medium to the next. In the air, the particles are the most far apart compared to the other two medium.
hope this helps! Giving me brainliest answer would be appreciated
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Explanation:
When a meteoroid enters the earth's atmosphere at high speed, a streak of light called meteor is observed. This light effect is produced by the ionization of air molecules in the upper atmosphere (at altitudes from 76 to 100 km). Most of these are the size of a grain of sand.
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2.0000 * 10^4=20000
20.000 * 10^3=20000
200.00 * 10^2=20000