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Sap is odorless when it first comes out of trees. It is only 2% sucrose at first and to make it into sweet maple syrup, you have to make that percentage higher and the percentage of water lower. This is done through heat-an evaporator. The sap then has a sweet smell. This is a chemical reaction because  the aroma changes along with its chemical makeup-percentage of what's in it.

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2 H2O2 (aq) → 2 H2O (l) + O2 (g)
Elephant toothpaste is when sodium iodine reacts with hydrogen peroxide by removing an oxygen atom. This creates a substance that is similar to foam, therefore changes the chemical formula and substance as a whole.

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CH ₂ OH⁻(CHOH)₄-CHO + ½O ₂ → CH ₂ OH⁻(CHOH)₄⁻CO ₂ H
The Blue Bottle Demonstration is when you shake a solution filled with a solution of glucose, sodium hydroxide, methylene blue and distilled water. The oxygen goes into the methylene when you shake it causing it to oxidize. When you stop shaking, the oxygen leaves the methylene causing it to change back to not having a color. This is a chemical change because the oxygen atoms and methylene atoms bond causing a new color.

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6CO ₂ + 6H ₂ O → C ₆ H ₁₂ O ₆ + 6O ₂
Photosynthesis is when water and carbon dioxide molecules are converted through light energy that is captured by chlorophyll. This is a chemical reaction because when this happens, a new substance is formed called glucose and oxygen.

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3Fe(s)+4H2O(g)→Fe3O4(s)+4H2(g)

When you perform the thermite reaction on a block of ice, it causes an explosion. This is because when heat is applied to thermite, it oxidizes causing the explosion. This is a chemical reaction because the temperature changes throughout the entire experiment of both the thermite and the block of ice.

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IO ₃⁻ + 2 H ₂ O ₂ + CH ₂(CO ₂ H)₂ + H⁺ --> ICH(CO ₂ H)₂ + 2 O ₂ + 3 H ₂ O
This experiment is when potassium iodate, malonic acid, and hydrogen peroxide all chemically bond to make a dark black color. This is a chemical change because the substance is colorless at first, but then creates a new color by the end.

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CH ₃ COONa
This experiment is when you pour supercooled sodium acetate-sodium acetate that is still a liquid below its freezing point-onto any surface and it creates crystal shapes and other ice-looking solids. This is a chemical reaction because the liquid sodium acetate turns into a solid as its chemical formula changes.

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2 Mg(s) + CO2(g) → 2MgO(s) + C(s)
When magnesium is ignited, it causes a bright white and produces a fire. This is a chemical reaction because the magnesium turns into fire without oxygen and cannot be reversed back into the magnesium.

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When a fruit rots, it produces a very gross smell, when before it had a sweet and fresh smell. This is a chemical reaction because you cannot un-rot a fruit and the smell completely changes as well.

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C ₁₂ H ₂₂ O ₁₁(s) + 12 O ₂(g) → 12 CO ₂(g) + 11 H ₂ O(g)
This experiment is when sucrose mixed with sulfuric acid that produces carbon and steam. The carbon forms a steam that overflows out of the beaker creating a sort of a "black snake". This is a chemical reaction because  the chemicals bond creating a new substance.

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Carbon Sugar Snake Experiment (Chemistry)

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NH4NO3+heat →NH4NO3
Calcium Oxide reacts with water to produce Calcium Hydroxide and heat. This is a chemical reaction because the reactants produce heat-exothermic.

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The chemistry of cold packs - John Pollard

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2AgNO3+1Cu →2Ag+1Cu(NO3)
This experiment is when silver nitrate reacts with copper to produce silver and copper nitrate. Copper nitrate is a solid substance, proving that this is a chemical reaction.

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Chemistry Experiment - Copper and Silver Nitrate Redox Reaction - Mr Pauller