Among the given options, burning a magnesium ribbon results in a chemical change. It is because the burning process changes magnesium into a new substance, magnesium oxide.
The process that results in a chemical change among the given options is D) burning magnesium ribbon. A chemical change is a process where one or more substances are altered into one or more new and different substances. In the case of burning magnesium ribbon, the magnesium reacts with the oxygen in the air to create a new substance, magnesium oxide. This is a characteristic of a chemical change, which is very different from physical changes caused by tearing tin foil, melting an iron bar, or crushing an aluminum can. These actions alter the physical state or shape of the matter, but not its internal structure or chemical composition.
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Answer:
28 grams
Explanation:
Molar mass of Nitrogen = 14 u
Mass = Mole * Molar Mass
= 2 * 14
= 28 g
- When [S] << Km, the reaction is second order and V0 depends on [S] and [Et].
- Their kcat is a second order rate constant.
- The lower their Km, the better they recognize their substrate, but the lower their reaction rate.
- When [S] << Km, V0 depends on [S] and [Et].
Answer:
1. True. 2. True. 3. Not true. 4. True. 5. True
Explanation:
1. Yes, because if the amount of substrate i much greater than of competitive inhibitor then the probability of substrate to bind to ferment is much higher than of inhibitor (if we have noncompetitive inhibitor it damages the structure of active site and the substrate concentration does not have a role in reaction rate).
2. Yeah, because then the michaelis-menten equation will transform into [tex} V0=(kcat*[E]*[S])/Km [/tex] and it is a second order equation.
3. No, because it is measured in sec-1 and that means it is 1 rate constant.
4. True, if the lower Km the better is binding and due to that rate is slower because it's harder for substrate to unbind.
5. The same as question two.
(2) increases
(3) remains the same
An electron in an atom moves from a ground state to an excited state when the electron energy increases
Excitation in physics is the addition of a number of discrete energies (called excitation energies) to a system — such as the nucleus of an atom, atom, or molecule — so as to produce a change, usually from the lowest energy state (ground state) to one of the higher energies (excited state).
In nuclear, atomic and molecular systems, excited states do not continue to be distributed but instead have certain discrete energy values. Thus, external energy (excitation energy) can be absorbed in discrete quantities.
Excitation energy is stored in excited atoms and the nucleus that emits light is usually seen from atoms and as gamma radiation from the nucleus because they return to the ground state. This energy can also be lost by collisions.
In the nucleus, energy is absorbed by protons and neutrons which are transferred to an excited state. Within a molecule, energy is absorbed not only by electrons, which are very enthusiastic for higher energy levels but also by whole molecules, which are highly excited for the discrete states of vibration and rotation.
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Electron moves brainly.com/question/496960
Excitation brainly.com/question/496960
Details
Class: High School
Subject: Chemistry
Keywords: electron, excitation, energies
The emission spectrum of hydrogen shows discrete, bright, colored lines. The characteristic that the Bohr model supported with observation is that electrons cannot exist in location other than in specific orbits.
According to characteristics of Bohr's atomic model;