Directions: II. Read each sentence. After each sentence, write why
commas have
been used.
Example A: Hey, what are you doing after school?
Answer: set off dialogue
1. After school,she needs to walk home do her homework and
washdishes.
2. I want to go to the movies, but I have to finish my homeworkfirst.
3. Once he gets to the baseball gamegJohn is going to relax eat andtalk.
4. Hey, do you think they will arrive ontime?
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Answer:
The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first-order reaction is a constant that is related to the rate constant for the reaction: t1/2 = 0.693/k. Radioactive decay reactions are first-order reactions.
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