Instructions Read the text and answer the questions Goals Answer all questions
| In an endothermic reaction, heat is absorbed from the environment and used in the reaction. In an exothermic reaction, heat is produced by the reaction. We're going to use a temperature sensor to test some reactions to find out if they're endothermic or exothermic.
There are also endothermic and exothermic processes that aren't chemical reactions. One example is an ice cube melting. When it melts, the water undergoes a state change from a solid to a liquid and absorbs heat from the environment. But because it's always just water there's no chemical change. What's another example of an endothermic process or chemical reaction? Why is the endothermic?
What's an example of an exothermic process or chemical reaction? Why is the exothermic?
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Goals Arduino Connected
| In the next section you'll use the temperature sensor to read the temperature in the palm of your hand and in a
container of ice water. Connect a temperature sensor to digital pin 2 on your Arduino, and connect your Arduino
to the computer.
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Instructions Read the text. Record a plot of the temperature over time. Goals Record a plot of the temperature over time
| In the following sections we'll use the temperature sensor to gather some data during a reaction. Below you'll see
an empty plot, the current reading from the sensor, and controls for recording data. Using a cup of ice water,
and the heat from your hand, record a few plots of changing temperature over time.
Start Recording will start plotting data from the sensor. Stop Recording will stop the
data collection. While it's stopped you can zoom in or out on the plot using the buttons on the top right, then
drag the plot around to see different parts. Clear Data will clear the plot so you can record a new run.
When you're familiar with how to use the temperature sensor, you can move to the next section. |
Instructions Follow the procedure to record a plot of the temperature over time. Answer the questions. Goals Answer all questions
| First, gather the following materials:
Important Make sure you're wearing gloves, splash-proof goggles, and lab aprons. Procedure:
Was this an endothermic or exothermic reaction? Why?
What was the minimum temperature the reaction reached?
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Instructions Follow the procedure to record a plot of the temperature over time. Answer the questions. Goals Answer all questions
| First, gather the following materials:
Important Make sure you're wearing gloves, splash-proof goggles, and lab aprons. Procedure:
Was this an endothermic or exothermic reaction? Why?
What was the maximum temperature the reaction reached?
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Instructions You have completed the lesson. You may scroll up to review the lesson. |