Student Exploration: Reaction Energy
Vocabulary: calorimeter, chemical bond, endothermic, enthalpy, exothermic, Hess’s law
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Two magnets are stuck together
...
Student Exploration: Reaction Energy
Vocabulary: calorimeter, chemical bond, endothermic, enthalpy, exothermic, Hess’s law
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Two magnets are stuck together. What might you have to do to get them to separate?
Pull them apart
2. Suppose you held two magnets a short distance apart, then let go. What would happen?
They would connect
3. Think about the magnets in terms of energy. In which case do you increase the potential
energy of the magnets? In which case do you increase the kinetic energy of the magnets?
Gizmo Warm-up
Just like magnets, atoms of different elements are
attracted together to form chemical bonds. Breaking
these bonds requires energy. When a new bond forms,
energy is released and temperatures rise. In the Reaction
Energy Gizmo™, you will explore how the energy of
chemical bonding relates to temperature changes that
occur during chemical reactions.
To begin, check that Reaction 1 and Forward are selected. In this reaction, hydrogen (H2) and
oxygen (O2) react to form water (H2O). The reaction takes place inside a device called a
calorimeter. Inside the calorimeter, a small chamber holds the reactants. The rest of the
calorimeter is filled with water.
1. Click Play ( ). What happens? When I clicked play, all of the separate H2 and O2
molecules formed to create H2O.
2. How does the temperature change? The temperature is increased while the molecules are
reacting to form water, and the increase in temperature slows once the molecules are all
bonded to create the H2O molecules. The temperature raises from 21.0 Degrees Celsius to
26.0 Degrees Celsius while the molecules were bonding.
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