which of the following atoms are involved in this reaction? * 2na + cl₂ → 2nacl\na. sodium and calcium\nb…

which of the following atoms are involved in this reaction? * 2na + cl₂ → 2nacl\na. sodium and calcium\nb. chlorine and oxygen\nc. sodium and chlorine\nd. sodium and carbon\n\na reaction shows 2 iron atoms reacting with 3 oxygen atoms. what is the * 10 points product?\na. feo\nb. fe₂o\nc. fe₂o₃\nd. fe₃o₂\n\na student observes bubbling, a temperature change, and a color change. * 10 points what conclusion can be made?\na. a chemical reaction has occurred\nb. the substance is dissolving\nc. the material has melted\nd. light is being absorbed\n\nwhat is required to balance the following equation? * 10 points _h₂+_o₂→_h₂o\na. 1,1,1\nb. 1,2,2

which of the following atoms are involved in this reaction? * 2na + cl₂ → 2nacl\na. sodium and calcium\nb. chlorine and oxygen\nc. sodium and chlorine\nd. sodium and carbon\n\na reaction shows 2 iron atoms reacting with 3 oxygen atoms. what is the * 10 points product?\na. feo\nb. fe₂o\nc. fe₂o₃\nd. fe₃o₂\n\na student observes bubbling, a temperature change, and a color change. * 10 points what conclusion can be made?\na. a chemical reaction has occurred\nb. the substance is dissolving\nc. the material has melted\nd. light is being absorbed\n\nwhat is required to balance the following equation? * 10 points _h₂+_o₂→_h₂o\na. 1,1,1\nb. 1,2,2

Answer

Explanation:

Step1: Analyze first reaction

In the reaction $2Na + Cl_2\rightarrow2NaCl$, the elements involved are sodium (Na) and chlorine (Cl).

Step2: Analyze second reaction

2 iron (Fe) atoms reacting with 3 oxygen (O) atoms gives the product with the formula $Fe_2O_3$ as we combine the atoms in the ratio they react.

Step3: Analyze third reaction

Bubbling, temperature change and color - change are signs of a chemical reaction.

Step4: Analyze fourth reaction

The balanced equation for $H_2 + O_2\rightarrow H_2O$ is $2H_2+O_2\rightarrow2H_2O$, so the coefficients are 2, 1, 2.

Answer:

  1. C. Sodium and chlorine
  2. C. $Fe_2O_3$
  3. A. A chemical reaction has occurred
  4. None of the above (the correct coefficients are 2, 1, 2)