Question

model 2 – results of alka-seltzer experiment

	trial 1	trial 2	trial 3	trial 4	trial 5
volume of vinegar (ml)	100.0	100.0	100.0	100.0	100.0
room pressure (kpa)	84	84	84	84	84
initial temp (°c) (vinegar solution)	23.5	23.5	23.5	23.5	23.5
final temp. (°c) (final mixture)	22.6	21.5	20.4	19.2	18.1

1. which trial in the model 2 data table corresponds to the reaction illustrated in model 1?

1. consider the five trials that produced the data in model 2.

a. what variable was purposefully changed in the experiment?
b. what variable changed as a result of changing the variable listed in part a?

1. what variable(s) shown in the model 2 data table remained constant among all the trials?

Explanation:

Question 5

To determine which trial in Model 2 corresponds to the reaction in Model 1, we analyze the final temperature. Model 1 likely shows a reaction with a certain temperature change, and we match it to the trial with the corresponding final temperature trend. Assuming Model 1 has a reaction leading to a final temperature, we check the table. Trial 1 has a final temp of 22.6°C, which might correspond. (Note: Since Model 1 details aren't fully given, but from the table, we infer based on typical reaction temp changes. If Model 1's reaction has a final temp matching Trial 1, then Trial 1 is the answer. Alternatively, if Model 1's reaction is the one with the highest initial - final temp difference, Trial 5 has the lowest final temp, but likely the question relates to the reaction's temp change. However, with the given table, the most probable trial corresponding (assuming Model 1's reaction is the one with the first trial's temp or a specific trend) is Trial 5? Wait, no, the initial temp is 23.5°C. Trial 1: 22.6 (decrease of 0.9), Trial 2:21.5 (decrease 2), Trial 3:20.4 (decrease 3.1), Trial 4:19.2 (decrease 4.3), Trial 5:18.1 (decrease 5.4). If Model 1's reaction has a certain temp change, but since the question is about which trial corresponds, maybe the last trial (Trial 5) if the reaction progresses over trials. But likely, the answer is Trial 5. Wait, the question says "Which trial in the Model 2 data table corresponds to the reaction illustrated in Model 1?". Since Model 1's reaction (not shown) but from the table, Trial 5 has the lowest final temp, so if Model 1's reaction is the most progressed (more Alka - Seltzer, but wait, number of Alka - Seltzer tablets: Trial 1:1, Trial 2:2, Trial 3:3, Trial 4:4, Trial 5:5. Oh! Wait, the first column: Number of Alka - Seltzer Tablets. Trial 1:1, Trial 2:2, Trial 3:3, Trial 4:4, Trial 5:5. So as the number of tablets increases, final temp decreases. So if Model 1's reaction has, say, 5 tablets, then Trial 5. But the question is which trial corresponds. So the answer is Trial 5.

In an experiment, the variable purposefully changed is the independent variable. Looking at the table, the "Number of Alka - Seltzer Tablets" changes from 1 to 5 across trials, while other variables like volume of vinegar, room pressure, initial temp of vinegar solution are constant. So the variable purposefully changed is the number of Alka - Seltzer tablets.

The variable that changes as a result of the independent variable (number of Alka - Seltzer tablets) is the dependent variable. From the table, the "Final Temp. (°C) of Final Mixture" changes (decreases) as the number of tablets increases. So the dependent variable (changed as a result) is the final temperature of the final mixture.

Answer:

Trial 5

Question 6a