All atoms of the same element must have the same number if protons, however the number of neutrons can vary, giving different isotopes of the element.
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The list of choices that you provided suggests profound silence, which is not too popular among scientists.
Answer A material that decreases the rate of a reaction. The amount of energy that reactants must absorb before a chemical reaction will start also called free energy of activation. What role does activation energy pay in chemical reactions? Activation energy is the energy absorbed before it can start a chemical reaction.
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0.5 M = 1 second. =. 1.0 M= 2 seconds
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for every 0.5 of a meter you add a second
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Frequency is of light depends upon the body that emits it. While wavelength depends on the medium through which it travels in vacuum the product of wavelength and frequency is the same while in other mediums the light of higher wavelength travels faster besed on refractive index. So light velocity depends on both frequency and wavelength.
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