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Predict what will be observed in each experiment below.

\begin{tabular}{|c|c|}
\hline
\textbf{Experiment} & \textbf{Predicted Observation (choose one)} \\
\hline

\begin{tabular}{l}
Two 250 mL samples of water are drawn from a deep \\
well bored into a large underground salt [tex]$(NaCl)$[/tex] deposit. \\
Sample \#1 is from the top of the well, and is initially at \\
[tex]$42^{\circ} C$[/tex]. Sample \#2 is from a depth of 150 m, and is \\
initially at [tex]$8^{\circ} C$[/tex]. Both samples are allowed to come to \\
room temperature [tex]$\left(20^{\circ} C \right)$[/tex] and 1 atm pressure. An NaCl \\
precipitate is seen to form in Sample \#1.
\end{tabular} &

\begin{tabular}{l}
A bigger mass of NaCl precipitate will form in Sample \#2. \\
A smaller mass of NaCl precipitate will form in Sample \#2. \\
The same mass of NaCl precipitate will form in Sample \#2. \\
No precipitate will form in Sample \#2. \\
I need more information to predict whether and how much \\
precipitate will form in Sample \#2.
\end{tabular} \\

\hline

\begin{tabular}{l}
A student sees tiny bubbles clinging to the inside of an \\
unopened plastic bottle full of carbonated soft drink. The \\
student opens the bottle and hears a loud hiss as gas \\
under pressure escapes from the bottle.
\end{tabular} &

\begin{tabular}{l}
The bubbles will shrink, and some may vanish. \\
The bubbles will grow, and more may appear. \\
The bubbles won't change. \\
I need more information to predict what will happen to the \\
bubbles.
\end{tabular} \\

\hline
\end{tabular}

Sagot :

GinnyAnsweridn
Let's analyze each experiment step-by-step:

### Experiment 1:
Situation:
- Two 250 mL samples of water are drawn from a deep well bored into a large underground salt (NaCl) deposit.
- Sample #1 is from the top of the well and initially at [tex]\(42^\circ C\)[/tex].
- Sample #2 is from a depth of 150 m and initially at [tex]\(8^\circ C\)[/tex].
- Both samples are allowed to come to room temperature ([tex]\(20^\circ C\)[/tex]) and 1 atm pressure.
- An NaCl precipitate is seen to form in Sample #1.

Solubility Information:
- The solubility of NaCl generally increases with temperature.
- Sample #1, initially being at a higher temperature ([tex]\(42^\circ C\)[/tex]), would dissolve more NaCl compared to Sample #2, which is at a lower initial temperature ([tex]\(8^\circ C\)[/tex]).
- As both samples cool (Sample #1) or warm up (Sample #2) to reach room temperature ([tex]\(20^\circ C\)[/tex]), the solubility of NaCl adjusts accordingly.

Observation:
- When Sample #1 cools from [tex]\(42^\circ C\)[/tex] to [tex]\(20^\circ C\)[/tex], the solubility of NaCl decreases, leading to precipitation of some of the dissolved salt.
- Since Sample #2 was initially at [tex]\(8^\circ C\)[/tex], and warming it to [tex]\(20^\circ C\)[/tex] increases its ability to hold dissolved salt, less NaCl precipitate will be formed compared to Sample #1.

Predicted Observation:
"A smaller mass of NaCl precipitate will form in Sample #2."

### Experiment 2:
Situation:
- A student sees tiny bubbles clinging to the inside of an unopened plastic bottle full of carbonated soft drink.
- The student opens the bottle and hears a loud hiss as the gas under pressure escapes.

Physics Explanation:
- When a bottle of carbonated drink is sealed, the pressure inside is higher than the atmospheric pressure and the CO[tex]\(_2\)[/tex] is dissolved in the liquid.
- Upon opening the bottle, the pressure inside the bottle drops quickly to match the atmospheric pressure.
- This sudden pressure drop causes the dissolved CO[tex]\(_2\)[/tex] to come out of the solution and form bubbles.

Observation:
- The initial sight of tiny bubbles clinging to the bottle is due to the higher pressure keeping CO[tex]\(_2\)[/tex] dissolved in the liquid.
- Upon opening, the decrease in pressure allows more CO[tex]\(_2\)[/tex] to escape, causing the bubbles to grow and more bubbles to appear.

Predicted Observation:
"The bubbles will grow, and more may appear."

Thus, based on the explanation provided:
1. Experiment 1: A smaller mass of NaCl precipitate will form in Sample #2.
2. Experiment 2: The bubbles will grow, and more may appear.
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