1. What is the law of conservation of mass? 2. How is the law of conservation of mass related to balancing equations?

3. What is a balanced chemical equation?

4. Balance the following combustion reaction, and draw a corresponding picture of the correct number of
particles.

C2​H4​ + O2​ → CO2​ + H2​O

5. I have ten moles of iron atoms in the reactant side of a reaction. Do I have enough information to determine
how many moles of iron atoms I will have following the reaction? If so, how many moles of iron atoms will I
have at the end of a reaction? If not, what else do I need to know?

6. I have three moles of Methane (CH4​) on the reactant side of the reaction. Do I have enough information to
determine how many moles of products I will have following a reaction? If not, what else do I need to know?

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

c. 4.54 x 10–12 j happens to be correct