Answer: II. The catalyst provides a new pathway in the reaction mechanism.
III. The catalyst speeds up the reaction.
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and more molecules convert to products.
The catalyst itself does not take part in the chemical reaction and gets regenerated as such at the end of the reaction without getting consumed.
<span>The answer should be false, because mass should not have to do with how bright a star is
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I'm not 100% sure on this one, but I think it's C.
Sorry, I'm not really good with Chemistry.
Hope this helps :)
Answer:
The answer is
<h2>184.54 g</h2>
Explanation:
The mass of a substance when given the density and volume can be found by using the formula
<h3>mass = Density × volume</h3>
From the question
density of iron = 7.92 g/mL
volume = final volume of water - initial volume of water
volume = 49.10 - 25.80
Volume = 23.3 mL
It's mass is
mass = 7.92 × 23.3 = 184.536
We have the final answer as
<h3>184.54 g</h3>
Hope this helps you
Its a mixture because nitrogen gas is air. Air is homogeneous mixture
