A student measures the length of two pieces of paper as 8.21 in and 8.0 in. What is the total length? Be sure to use sig. figs. in
your answer. Do not include the unit.

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope

What relationship exists between an enzyme and a catalyst?

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above