Bonjour est ce qu'une personne poirrait m'aider à faire cet exercice. Je n'y arrive vraiment pas
merci d'avance​

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.