1. which of the following are compounds?\no₂\nnacl\npotassium\nwater\nsilicon dioxide\n2. in a chemical…

1. which of the following are compounds?\no₂\nnacl\npotassium\nwater\nsilicon dioxide\n2. in a chemical reaction, what are the substances called that start the reaction?\nproducts\nstarters\nreactants\noriginal\nother:

1. which of the following are compounds?\no₂\nnacl\npotassium\nwater\nsilicon dioxide\n2. in a chemical reaction, what are the substances called that start the reaction?\nproducts\nstarters\nreactants\noriginal\nother:

Answer

Brief Explanations:

  1. A compound is a substance made up of two or more different elements chemically combined. $O_2$ is an element (oxygen molecule), potassium is an element. $NaCl$ (sodium - chloride), water ($H_2O$), and silicon dioxide ($SiO_2$) are compounds as they consist of different elements.
  2. In a chemical reaction, the substances that start the reaction are called reactants. Products are the substances formed after the reaction, and "Starters", "Original" are not the correct terms in this context.

Answer:

  1. B. $NaCl$, D. Water, E. Silicon dioxide
  2. C. Reactants