A snail takes 36 minutes to cross a highway. How many minutes would it take the snail to cross the same highway 7 times?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.

In a ball-and-stick molecular model, what do the sticks represent?