A student is using a thermometer to measure an endothermic reaction. What should her temperature data show?(1 point)ResponsesThe temperature of the starting materials and ending materials do not change.The temperature of the starting materials and ending materials do not change.The reaction beaker feels warm when she picks it up.The reaction beaker feels warm when she picks it up.The temperature of the materials goes up as the chemical reaction progresses.The temperature of the materials goes up as the chemical reaction progresses.The temperature of the materials goes down as the chemical reaction progresses.

Answer 1

In an endothermic reaction, the system absorbs heat from the surroundings, which typically results in a decrease in temperature of the reaction mixture. Therefore, the student's temperature data should show:

The temperature of the materials goes down as the chemical reaction progresses.

This is the correct response because in an endothermic reaction, energy is absorbed, leading to a temperature drop observed in the materials being measured.

Answer 2

Determine whether each process is endothermic or exothermic.(3 points)Endothermic Exothermica fire (the system is the fire)a car engine (the system is the engine)a melting ice sculpture (the ice is the system

Answer 3

Here’s a classification of each process as endothermic or exothermic:

1. A fire (the system is the fire): Exothermic

   • Fires release heat and light as a result of combustion, making it an exothermic process.

2. A car engine (the system is the engine): Exothermic

   • A car engine produces heat as fuel combusts, resulting in energy being released to do mechanical work. This is also an exothermic process.

3. A melting ice sculpture (the ice is the system): Endothermic

   • Melting ice requires the absorption of heat from the surroundings, which makes this process endothermic.

To summarize:

• Fire: Exothermic
• Car engine: Exothermic
• Melting ice sculpture: Endothermic