Question

endothermic reaction
define
a chemical reaction that
absorbs heat from its surroundings
with a positive change in
enthalpy
example:
$6co_2 + 6h_2o \xrightarrow{sunlight} c_6h_{12}o_6$
draw:
draw an example showing reactants

Explanation:

The required diagram is an energy level diagram for an endothermic reaction (photosynthesis, the given example). It shows reactants at lower energy, products at higher energy, with energy absorbed from the surroundings, and labels for activation energy, enthalpy change ($\Delta H > 0$), reactants ($6\text{CO}_2 + 6\text{H}_2\text{O}$), and products ($\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$, the full balanced reaction).

Answer:

Energy
    |
    |        Products: C₆H₁₂O₆ + 6O₂
    |          ●
    |         / \
    |        /   \ Activation Energy
    |       /     \
    |      /       \
    |     /         \
    |    ● Reactants: 6CO₂ + 6H₂O
    |
    ─────────────────────────────────── Reaction Progress
    ↑
    ΔH = Positive (Heat Absorbed)

(Note: This is a simplified representation; in a formal diagram, the axes are clearly labeled: y-axis = "Potential Energy", x-axis = "Reaction Progress", and the upward arrow for ΔH is drawn between reactant and product energy levels.)