2.91 is the amount of atoms
Matter needs to be in the state called a plasma. The sun is made of plasma, for example. A plasma is when the electrons have been stripped from the atoms.
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There is no way to know which reaction requires which catalyst. However, if you apply copper to a reaction where it does act as a catalyst, the rate of reaction will be much faster as it lowers the activation energy for successful collisions.
Answer:
Double displacement reaction
Explanation:
Cuz both the anions and cations from reagents flipped on product side.
Science, Economics, Statistics, Finance, and many other areas of life where we are measuring things to a certain level of accuracy.