Memory Anchor:

• Students can identify the number of elements in a compound from its formulae. -
• Students can identify the number of atoms in a compound from its formulae
Chemical reactions result from the rearrangement of atoms.DESIRABLE:
• No particles are created or destroyed in a chemical reaction.
• Therefore the equation needs to be balanced.
Photosynthesis is an endothermic chemical reactions because it takes energy to build bigger molecules.Respiration is an exothermic chemical reactions because it releases energy when bigger molecules are split.

Super Challenge:

Stretch:

Challenge:

Key Questions:

1. What is the symbol equation for photosynthesis?
   • The symbol equation for photosynthesis is: CO<SUB>2</SUB> plus H<SUB>2</SUB>O -> C<SUB>6</SUB>H<SUB>12</SUB>O<SUB>6</SUB> With a wavy arrow showing the light Energy.
2. What happens to atoms in chemical reactions?
   • Chemical reactions result from the rearrangement of atoms.
3. What happens to the numbers of each atom in a chemical reaction?
   • No Particles are created or destroyed in a chemical reaction. Therefore the equation needs to be balanced.
4. What makes photosynthesis an endothermic reaction?
   • Photosynthesis is an endothermic chemical reactions because it takes Energy to build bigger molecules.
5. What is the symbol equation for respiration?
   • The symbol equation for respiration is: C<SUB>6</SUB>H<SUB>12</SUB>O<SUB>6</SUB> -> CO<SUB>2</SUB> plus H<SUB>2</SUB>O With a wavy arrow showing the Energy leaving the reaction.
6. What makes respiration an exothermic reaction?
   • Respiration is an exothermic chemical reactions because it releases Energy when bigger molecules are split.