Answer: precipitate
Explanation: Chemical change is a change in which the chemical composition of the atoms changes. The following changes are seen when chemical reaction takes place:
1) Release or absorption of heat
2) Formation of solid or a precipitate
3) Change in color
4) Production of gas
Explanation:
Involves combining of nuclei: Nuclear fusion
Nuclear fusion is a radioactive reaction in which small atomic nuclei combines into larger ones with the release of a large amount of energy. The energy released is used to furnish a series of chain reactions.
Produces dangerous radioactive waste: Nuclear fission
Nuclear fission is used in powering most nuclear power plants. The products of these reactions are radioactive in nature. They are very dangerous to human health and the environment at large.
Have high activation energies: Nuclear fusion
The activation energy is the energy barrier that must be overcome before a reaction starts. Nuclear fusion reactions require very high amount of energy input to overcome the activation needed to start the reaction.
Releases large amounts of energy: Nuclear reactions
Both nuclear fusion and fission releases large amount of energy.
Occurs in the stars: Nuclear fusion
Nuclear fusion occurs in stars and they involve the combination of atomic nuclei to form larger ones.
Drives chemical plants: Nuclear fission
Chemical plants uses electricity and nuclear power plants can produce electricity through nuclear fission.
Learn more:
Nuclear reactions brainly.com/question/9566647
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Atomic number is 57, and the atomic mass is 138.90547 u + 0.00007 u
Answer:
It is required 0.3 molecules of O2 to produce 0.6 molecules of H2O
Explanation:
The water´s formation reaction is: 2H2 + O2 --> 2H2O
This reaction shows the molecular O2:H2O ratio: 1:2.
Then, if we want to know how many molecules of O2 are required to produce 0.6 of H20, it is necessary calculate as it showed next:
0.6 molecules H2O * (1 molecula O2 / 2 molecules H2O)= 0.3 molecule O2
