Which of the following is evidence of a chemical reaction? (a) Dropping potassium metal into water gives a violet flame. (b) Dropping chromium metal into acid produces gas bubbles.

Please answer all parts of the question. Thank you! 1. For each of the following, write the balanced net ionic equations. Show your work! (a) Solutions of nickel (III) nitrate and cesium hydroxide are mixed (b) A solution of hydrochloric acid is added to a solution of potassium carbonate. (c) Chlorine gas is bubbled through a solution of lithium iodide.

Does a reaction occur when aqueous solutions ofpotassium acetate and sodium carbonate are combined? If a reaction does occur, write the net ionic equation.

true or false(a) if a substance is oxidised, it is gaining electrons.(b) if an ion is oxidised, its oxidation number increases.