Which of the following represents a compound?

Na
CO2
Со
Mn

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Na chemical reaction, activation energy increases the of the reactants. this outcome causes the particles to collide, which results in the of new products.

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions