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Leaves changing colour

xCO₂+xH₂O -> Cx(H₂O)+xO₂

This is an example of a single replacement reaction as the Carbon bonds with the water (H₂O) and the oxygen is replaced. The synthesis of chlorophyll which provides the bright colour in leaves requires warm temperatures to synthesize (which in fall it does not have) therefore leading to this chemical reaction that causes the leaves to change colour.

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Gas stove
CH₄ + 2 O₂ ----> CO₂ + 2 H₂O
This is an example of a combustion reaction. In a gas stove, the methane reacts with oxygen molecules from the air to make carbon dioxide and water. The products contain less chemical energy in their bonds than do the reactants. The excess energy is given off as heat and light.

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Baking cookies. When the baking soda (sodium bicarbonate) is heated, it causes a chemical reaction 2NaHCO ₃ –> Na ₂ CO ₃ + H ₂ O + CO ₂ where the combustion brings out carbon dioxide and makes bubbles in the cookies (makes the cookies a bit “fluffy” in a sense). This could also count as decomposition since the compound is breaking up into simpler compounds.

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Photosynthesis

The balanced equation for photosynthesis is:

6CO2  + 6H₂O + Sunlight (energy) ———> C₆H₁₂O6  + 6O2

The reactants of photosynthesis are carbon dioxide, water, and sunlight energy and the products of photosynthesis are glucose and oxygen.

This is a synthesis equation because similar parts such as CO2 and H2O combine to make a more complex compound of glucose.

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baking soda and vinegar:
HC₂H₃O₂(aq) + NaHCO₃(aq)  → NaC₂H₃O₂(aq) + H₂O() + CO₂(g). This is a double displacement or metathesis reaction. when these ingredients are mixed together they produce carbon dioxide gas. this reaction forms the "bubbles" in the volcano, and also helps baked goods rise.

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fireworks
symbol equation: 2KNO3 + S + 3C → K2S  + N2 + 3CO2
word equation: potassium nitrate +  sulfur + carbon (in charcoal form) → potassium sulfide + nitrogen gas +  carbon dioxide
combustion reaction
depending on the chemical used, the fireworks explode with different colours

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Caramelization: C125H188O80.

This occurs at 356 degrees Fahrenheit, and is the last chemical reaction to during baking.

The brown colors are produced by three groups of polymers: caramelans (C₂₄H₃₆O₁₈), caramelens (C₃₆H₅₀O₂₅), and caramelins (C₁₂₅H₁₈₈O₈₀).
This reaction occurs:

high heat causes sugar molecules to break down and release water, which turns into steam

Diacetyl, which gives caramel its butterscotch flavor

esters and lactones are produced

Production of furan molecules

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Hot ice experiment:

CH3COONa + H2O → H3O + NaCH2COO

This equation is used for the "hot-ice experiment", where the compound can remain a liquid before its freezing state. It's known as hot ice because of its crystal state.

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rust
iron and oxygen make iron (III) oxide, more commonly known as rust.

The equation of turning iron and oxygen into iron (III) oxide is: 4Fe + 3O2 → 2Fe2O3. This is a synthesis reaction, and you can see it occur in many different places since it's what happens when iron is exposed to oxygen.

You can see it on the chains of swing sets, as well as cheap jewelry, which is why it's better to get jewelry that uses other metals instead, since iron rusts really easily.

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The chemical reaction I'm doing is coffee. The molecular formula for coffee is C₂₅H₂₈N₆O7.  Most of the reason why people drink coffee is because it can keep them awake. When coffee is synthesized into the body it creates 3 different Chemicals, shown below.
Most of Caffeine is made into paraxanthine, (C7H8N4O2) which stimulates the central nervous system to keep you awake.