1). Recreational facilities should allow people to do amusing and relaxing activities.



2). The people of a community can meet certain needs more efficiently by working together.

3). Local courts, judges, and law enforcement officers help maintain peace and order in a community.

4). Many recreational facilities are not maintained at public expense.

5). People may form communities to work together in order to improve the quality of life for everyone.

6). Services such as providing water, a sewage system, and trash removal can only be performed by the local government.



Directions: Please highlight, change the color, or bold the best answer.

7). One place that provides recreation is

a. an office building.

b. a skating rink.

c. a movie theater.

d. both B and C are correct

8). Trash collection is an example of a

a. government ordinance.

b. recreational activity.

c. crossroad.

d. public utility.

9). People live in communities to

a. live and work with others.

b. live in privacy.

c. raise their own crops.

d. none of the above

10). Communication helps people

a. share knowledge.

b. respect one another.

c. make good decisions.

d. all of the above

Experiment: effect of solution concentration on reaction rate you have learned that as the concentration of reactants increases, there will most likely be a greater number of collisions, and hence increase the rate of a reaction. in this experiment, you will see a demonstration of this, with a twist. there will be three reactions going on in this experiment. objectives determine how solution concentration can affect the rate of a reaction. the first reaction will be a reaction of the iodide ion (i-1) with hydrogen peroxide (h2o2) in an acidic solution. this reaction produces a slightly orange solution. in our experiment, we will add some orange food coloring to make this solution more orange. 2 h+ (aq) + 2 i- (aq) + h2o2 (aq) ⟶ i2 (aq) + 2 h2o (l) the next reaction will be between the iodine and starch i2 + starch ⟶ i2-starch complex (blue-black) so, when starch is added to the iodine solution made from the first reaction, the solution will turn black immediately, so it is difficult to find the rate of reaction. in order to be able to time this reaction, you will slow it down with another reaction. adding ascorbic acid will react with the iodine, reducing the concentration of the iodine available to react with the starch. c6h8o6 (aq) + i2 (aq) ⟶ 2i- (aq) + c6h6o6 (aq) + 2 h+ (aq) when the ascorbic acid is used up, the remaining iodine molecules can react with the starch and form the black color. the more ascorbic acid you add, the slower the reaction to form the iodine-starch complex will be. use your data and observations to complete the assignment. analysis and conclusions submit your data and the answers to these questions in the essay box below. what was your hypothesis? plot your data as drops of ascorbic acid vs. time. as the concentration of ascorbic acid was increased, did the rate of the formation of the iodine-starch complex increase or decrease? explain your answer in terms of the chemical reactions involved. was your hypothesis correct? make a general rule about the effects of concentration of reactants on reaction rates. for practice, the molecular formula for ascorbic acid is c6h8o6, and you used 6 g in this experiment, calculate the molarity of the ascorbic acid. now calculate the concentration in moles per drop (assume 1 ml = 20 drops).