4Fe + 3O₂ + 6H₂O → 4Fe(OH)₃

Oxygen and water react with iron to form rust, which weakens metals.

Signals : Color change (silver to reddish-brown)

Sensor : Light Sensor

C H 3 C O O C 2 H 5 + N a O H → C H 3 C O O N a + C 2 H 5 O H.

Saponification is the hydrolysis of an ester to form an alcohol and the salt of a carboxylic acid in acidic or essential conditions

Signals: The water and soap mixed up turn into bubbles

Sensors: Ph levels

Burning food is a chemical reaction because when you accidentally burn the food, you scorch it and it turns some parts into ashes. 

• Color change (from the original food color to burnt black.)

• Temperature change (Turns hot)

Temperature sensor

Help you keep the food from burning because you can tell when the food is perfectly cooked.

2NaHCO₃ –> Na₂CO₃ + H₂O + CO₂

• When the sodium bicarbonate (baking soda) absorbs heat, a chemical reaction occurs

• Signals:cookie to have a light brown, shiny crus

• Sensore: Temperature Sensore

CH3COOH + NaHCO3 --> NaC2H3O2 + H2O + CO2

The acetic acid in vinegar reacts with sodium bicarbonate (baking soda), producing carbon dioxide gas, water, and sodium acetate.

Bubbling and fizzing as gas is produced.

C6​H12​O6​(s)+O2​(g)→C(s)+H2​O(l)+CO2​(g)+N2​(g)

Composting is the managed, aerobic (oxygen-required) biological decomposition of organic materials by microorganisms

Damp, moist consistency

Temperature and humidity sensor

wood reacts with oxygen in the air to produce heat, light, carbon dioxide, water vapor, and ash. 

CH4 + 2O2 → CO2 + 2H2O

The gas is burned, producing Carbon Dioxide and Water.

Temperature and Light sensors can be used to detect the chemical change from the fire.

CH4+4O2→CO2+H2O (plus heat!)

The burning of wood is a chemical change as it leads to the formation of new substances like carbon dioxide gas, water vapour, ash, etc. these substances have entirely different chemical composition than that of wood.

Chemical equation: C2 H4 + 3 O2 (g) —> 2 CO2 (g) + 2 H2O (I)

This equation shows the result of enzymatic reaction where it breaks down the  food particle by bacteria and fungi, which creates a spoiled appearance.

Its signal are observable by its looks and smells. Example, All fruit skin color became brown which slowly turns black and gives a foul smell.

Sensor: PH & Acid and Gas sensor.

4Cu(OH)2​+SO2​+O2​→Cu4​(OH)6​SO4​

Over long periods, especially in moist air containing carbon dioxide (CO₂) and sulfur dioxide (SO₂), copper develops a green patina, which protects it from further corrosion. This occurs in two main steps:

Chemical Equation: CH3COOC2H5+NaOH→CH3COONa+C2H5OH

Description: The process I choose is called saponification, the process of creating soap! Saponification works by converting fats, oils, or lipids (the acid) combining them

Signals: Sodium hydroxide makes the soap after heating.

Sensors: Sodium hydroxide sensor

Chemical equation: C6H12O6 + 6O2 = 6CO2 + 6 H2O

Description: When wood is set on fire, the Carbon present in the form of Methane or butane combusts in the presence of Oxygen to form water and Carbon dioxide.

Signals: Color change, temperature change

Sensors: Color sensor, temperature sensor

CH3COOH + NaHCO3 = CH3COONa + CO2 + H2O

Mixing baking soda (sodium bicarbonate) and vinegar (acetic acid) causes a chemical reaction that produces salt (sodium acetate) and water, as well as carbon dioxide gas.

-Chemical reaction

-Can detect when the reaction occurs

-Reaction detector

Chemical Equation: NaHCO3 + H+ → Na+ + CO2 + H2O

Description: Baking a cake produces an endothermic reaction that changes the sticky batter into a solid cake.

Signals: Temperature change

Sensor: Temperature sensor

6CO2 + 6H2O → C6H12O6 + 6O2

The process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Signals: Gas production

Sensor: Light sensor

C6H12O6 + 6O2 = 6CO2 + 6 H2O

wood in the presence of heat and oxygen is transformed into carbon dioxide, water vapour, and ash.

Sensors: Heat sensor

the process of creating soap

CH3COOC2H5+NaOH→CH3COONa+C2H5OH

signal: pH change and increasing temperature

sensor: Temperature and pH sensor

C6H12O6 + 6O2 = 6CO2 + 6 H2O.

Combustion wood is an example of a chemical reaction in which wood in the presence of heat and oxygen is transformed into carbon dioxide, water vapour, and ash.

Sensor: Heat sensor

C (s) + O2 (g) →CO2 (g)

A chemical process in which a substance reacts rapidly with oxygen and gives off heat.

• Smoke (gas release)

• Temperature change

• Thermal sensor

• optical sensors