To burn a piece of paper, why must the paper touch the flame?

As you move from right to left on the periodic table the atomic radius fill in the blank

During trial 2, what allowed you to determine that aluminum was the limiting reactant? check all that apply. all of the copper dissolved. all of the aluminum dissolved. the solution turned clear. the number of grams of copper(ii) chloride used in the reaction was greater than the number of grams of aluminum. the molar ratio of copper(ii) chloride to aluminum was greater than 3: 2, the equation’s molar ratio.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5