Lesson 4: Chemistry exothermic endothermic

Open Ended

800,000,000

40%

3rd biggest

Guess what any of these numbers mean?

Open Ended

What can chemical potential energy be transformed into?

Multiple Choice

Understanding Check: You mix two reactants in a test tube. It feels cooler than it did before. It is an...

• exothermic reaction.

• endothermic reaction.

Drag and Drop

The chemical reaction of 2K_(s) + Cl_2(g) → 2KCl_(s) which explodes is an ​

Placeholder

. The product KCl has a ​

Placeholder

energy level.

Drag these tiles and drop them in the correct blank above

exothermic reaction

lower

endothermic reaction

higher

equal

Drag and Drop

Based on this energy-level diagram for the chemical reaction O₂ + N₂ → 2NO, it is an ​

Placeholder

and would feel ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

endothermic reaction

cold

exothermic reaction

hot

room temperature

Open Ended

In endothermic reactions, there is an increase in energy of the system. What happens to the energy of the surrounding?

Multiple Choice

Although many individual reactions are part of photosynthesis, the following chemical equations can be used to represent the overall process.

Photosynthesis:

6 H₂O + 6 CO₂ + energy → 6O₂ + C₆H₁₂O₆

• exothermic reaction

• endothermic reaction

Drag and Drop

When steel wool reacts with vinegar, heat is ​

Placeholder

in an ​

Placeholder

.

When baking soda reacts with vinegar, heat is ​ ​

Placeholder

in an ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

released

exothermic reaction

absorbed

endothermic reaction