6. Heat of combustion is the heat released by the complete combustion of one mole of a substance.- T?
7. Catalysts are not consumed during a reaction.- F
8. In nature, processes tend to occur that lead to a higher energy state.- F
9. Concentration does not have an effect on a reaction.- F
17. Nuclear binding energy is released when a nucleus is formed.- T
18. Nuclei with an even number of protons and neutrons tend to be unstable or radioactive.- F
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-MC
To verify the accuracy of these statements, we can use reliable sources such as textbooks or reputable scientific websites. Additionally, we can use our knowledge of the topics to assess the statements.
6. Heat of combustion is the heat released by the complete combustion of one mole of a substance. - True
The heat of combustion refers to the energy released when a substance undergoes complete combustion. This can be determined experimentally by measuring the heat change during the reaction. Alternatively, it can be calculated using the standard enthalpy of formation of the reactants and products.
7. Catalysts are not consumed during a reaction. - False
Catalysts are substances that speed up chemical reactions by providing an alternative reaction pathway with lower activation energy. While catalysts are not consumed in the reaction, they can undergo physical or chemical changes, and may be deactivated or destroyed over time.
8. In nature, processes tend to occur that lead to a higher energy state. - False
In nature, processes tend to occur that minimize energy or attain a lower energy state. This is known as the principle of minimum potential energy. For example, objects tend to fall towards the ground to reach a lower gravitational potential energy state.
9. Concentration does not have an effect on a reaction. - False
Concentration plays a significant role in determining the rate of a reaction. Increasing the concentration of reactants generally increases the chance of effective collisions between particles, leading to a faster reaction rate. The effect of concentration on a reaction can be explained using the collision theory.
17. Nuclear binding energy is released when a nucleus is formed. - True
Nuclear binding energy refers to the energy required to break apart the nucleus of an atom. When a nucleus is formed through nuclear reactions, such as fusion or fission, energy is released due to the conversion of mass into energy according to Einstein's famous equation, E=mc².
18. Nuclei with an even number of protons and neutrons tend to be unstable or radioactive. - False
Nuclei with an even number of protons and an even number of neutrons tend to be more stable compared to nuclei with odd numbers of protons and neutrons. Nuclei with an odd number of protons or neutrons can be stable, but they can also be unstable or radioactive depending on their specific nuclear properties.