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Before Class Exploration_U7
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1. The chemical reaction we are investigating in this simulation is represented with the chemical equation R(g) + GB(g) ---> RG(g) + B(g). Looking at the Sample Region (the container on left in the Figure below, describe the shape and color of the reactants R and BG. Also identify each as an atom or a molecule. *
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2. Look in the right portion (the Control Bar region) of Figure below, how many moles of R and GB are represented in the reaction window initially (before starting the reaction)?
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3a. In Question 4 you will watch a movie of the reaction, before watching the movie make a prediction. If we assume the reaction goes to completion how many mole of the products, RG and B are formed? (Remember the chemical equation in Q1 that describes this reaction.)
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3b. Predict how many moles of R and BG will remain after the reaction reaches completion? (Remember the chemical equation in Q1 that describes this reaction.)
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3c. What is your reasoning for your predictions in Question 3a and 3b?
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4a. After starting the movie below watch the reaction as it occurs in the Sample region. Watch the number of moles of reactants and products. Also watch the concentration chart recording (lower right). When you feel the reaction is complete enter the moles of the reactants and the products. (NOTE: be sure to make the correct assignment when you read the values of the moles in the Control Bar region and enter their respective values below.)
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4 (movie). Shifting Reaction : R(g) + BG(g) --> RG(g) + B(g) NOTE: After starting the movie below the reaction between R and BG will not begin until Enable Reaction button is clicked.
4. b) Based on the moles of reactants, R and BG, and products, RG and B, how do your predictions in Question 3 compare? c) Did you ever see a point where your prediction of the amounts of reactants and products occurred?
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5. The reaction you watched in the movie in Question 4 is an example of a reversible reaction. Reversible reactions have three characteristics: i) at the microscopic level the reaction goes in both directions, left to right and right to left; ii) the reaction continuously occurs; iii) there are amounts of all species present, i.e. no reactant ever has zero amount. Watch another movie below. Is the reaction, 2R(g) --> R₂(g), that you observe in the movie reversible? or irreversible?
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5 (movie). This movie depicts the reaction 2R(g) --> R₂(g)
6. Watch another movie below. Is the reaction, BG(g) --> B(g) + G(g), that you observe in the movie reversible? or irreversible?
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6 (movie). This movie depicts the reaction BG(g) --> B(g) + G(g)
7. If there is one question you would like to have answered in class, what would that question be?
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8. Is there anything about the questions that you feel you do not understand? List your concerns/questions.
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