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Copper+Sulfur=Copper Sulphide

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Sulphur dioxide+oxygen>Sulfur trioxide

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Sulfur+Carbon+Oxygen>Sulfur trioxide

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Dinotrogen tetrahydride+oxygen= Nitrogen + Water

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Copper +  Oxygen   ---------   Copper Oxide

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Copper +  Oxygen   ---------   Copper Oxide

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Sulfur + Oxygen  ------- Sulfur Dioxide

Decomposition Reaction

Calcium Carbonate---- Calcium Oxide + Carbon dioxide gas

Neutralization Reaction

Hydrochloric acid + Sodium hydroxide ---- Sodium Chloride + water

Displacement Reaction
Zinc + Hydrochloric acid ---- Zinc Chloride +  hydrogen gas

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Copper combines with oxygen and forms Copper Oxide.

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Copper combines with oxygen and forms Copper Oxide.

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Sulfur dioxide and oxygen combine to produce sulfur trioxide.

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Sulfur dioxide and oxygen combine to produce sulfur trioxide.

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Dinotrogen tetrahydride reacts with oxygen to produce nitrogen and water.

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Dinotrogen tetrahydride reacts with oxygen to produce nitrogen and water.

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Carbon dioxide and water are produced when methane burns in the presence of oxygen.

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Carbon dioxide and water are produced when methane burns in the presence of oxygen.

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The five basic types of chemical reactions are
1.Combination
Methane+oxygen>carbon dioxide+water
2.Decomposition: Hydrogen peroxide>water+hydrogen
3.Single-replacement
Potassium+water>Potassium hydroxide.
4.Double-replacement
metal oxide+acid>salt+water+heat
5.Combustion
Fuel+oxygen>carbon dioxide+water

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Physical changes of mixing sand and water.
mixing salt , sand and water is a physical change. Even though you mix salt and water and it dissolves it can be separated by boiling water and it would separate the salt and mixing in the sand was able to be filtered. No new substance was created during this lab making it a physical change.

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Chemical equations:
rusting of iron: 4Fe + 3O₂ + 6H₂O → 4Fe(OH)3
Word equations: iron + oxygen → iron oxide. magnesium + oxygen → magnesium oxide

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I learnt about Chemical changes and how  chemical changes can't be reversed.
Padlet wall is interesting but I still don't know what it is

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TYPES of CHEMICAL REACTIONS and EXAMPLES

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TYPES of CHEMICAL REACTIONS and EXAMPLES

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SYNTHESIS REACTION:
Combination of sodium (Na) and chlorine (Cl) to produce sodium chloride (NaCl). CH4+O2=CO2+H2O

2Na+Cl2=2NaCl.

DECOMPOSITION REACTION:
Breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen. Hydrogen peroxide----------- Hydrogen+ water

SINGLE REPLACEMENT REACTION:
The reaction between magnesium, Mg, and hydrochloric acid, HCI, forms magnesium chloride, MgCl2, and hydrogen, H2.

DOUBLE REPLACEMENT REACTION:
The reaction between silver nitrate and sodium chloride.

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Bursting of crackers is a chemical change because the explosive reactants are transformed into a gaseous products along with heat, light and sound which cannot be reversed. Hence, it is a chemical change.
2C2H6(g)+7O2(g) : 4CO2(g)+6H2O(g)+Heat energy

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I learned that chemical reactions produce a different substance aswell

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Bursting of crackers

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A process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
For Example:

Burning of coal, wood, paper, kerosene, etc.

Formation of curd from milk.

Electrolysis of water to form hydrogen and oxygen.

Rusting of iron.

Bursting of a cracker.

Cooking of food.

Digestion of food.

Germination of seeds.

Chemical Reactions. ... Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules.

Chemical reactions are the processes by which chemicals interact to form new chemicals with different compositions. Simply stated, a chemical reaction is the process where reactants are transformed into products. How chemicals react is dictated by the chemical properties of the element or compound- the ways in which a compound or element undergoes changes in composition.

Describing Reactions QuantitativelyChemical reactions are constantly occurring in the world around us; everything from the rusting of an iron fence to the metabolic pathways of a human cell are all examples of chemical reactions. Chemistry is an attempt to classify and better understand these reactions.The rusting of a chain is an example of a chemical reactionA chemical reaction is typically represented by a chemical equation, which represents the change from reactants to products. The left hand side of the equation represents the reactants, while the right hand side represents the products. A typical chemical reaction is written with stoichiometric coefficients, which show the relative amounts of products and reactants involved in the reaction. Each compound is followed by a parenthetical note of the compound’s state of 2: (l) for liquid, (s) for solid, (g) for gas. The symbol (aq) is also commonly used in order to represent an aqueous solution, in which compounds are dissolved in water.

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Top 10 Amazing Chemical Reactions that Should not be Tried at Home. Compilation

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I have learned that chemical change produces a new product.
I have learned that burning is a combustion reaction.
I love working on padlet wall.

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Exothermic reaction as heat energy is released.

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Exothermic reaction as heat energy is released.

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Methane + Oxygen = Carbon dioxide + Water

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A combustion reaction is a major class of chemical reactions, commonly referred to as "burning." In the most general sense, combustion involves a reaction between any combustible material and an oxidizer to form an oxidized product. It usually occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water. Good signs that you're dealing with a combustion reaction include the presence of oxygen as a reactant and carbon dioxide, water, and heat as products. Inorganic combustion reactions might not form all of those products but remain recognizable by the reaction of oxygen.

Combustion Doesn't Necessarily Mean Fire

Combustion is an exothermic reaction, meaning it releases heat, but sometimes the reaction proceeds so slowly that the change in temperature is not noticeable. Combustion doesn't always result in fire, but when it does, a flame is a characteristic indicator of the reaction. While the activation energy must be overcome to initiate combustion (i.e., using a lit match to light a fire), the heat from a flame may provide enough energy to make the reaction self-sustaining.

General Form of a Combustion Reaction

hydrocarbon + oxygen → carbon dioxide + water

Examples of Combustion Reactions

It's important to remember that combustion reactions are easy to recognize because the products always contain carbon dioxide and water. Here are several examples of balanced equations for combustion reactions. Note that while oxygen gas is always present as a reactant, in the trickier examples, the oxygen comes from another reactant.

Complete Versus Incomplete Combustion

Combustion, like all chemical reactions, does not always proceed with 100% efficiency. It's prone to limiting reactants the same as other processes. As a result, there are two types of combustion you're likely to encounter:

Complete Combustion: Also called "clean combustion," complete combustion is the oxidation of a hydrocarbon that produces only carbon dioxide and water. An example of clean combustion would be burning a wax candle: The heat from the flaming wick vaporizes the wax (a hydrocarbon), which in turn, reacts with oxygen in the air to release carbon dioxide and water. Ideally, all the wax burns so nothing remains once the candle is consumed, while the water vapor and carbon dioxide dissipate into the air.

Incomplete Combustion: Also called "dirty combustion," incomplete combustion is hydrocarbon oxidation that produces carbon monoxide and/or carbon (soot) in addition to carbon dioxide. An example of incomplete combustion would be burning coal (a fossil fuel), during which quantities of soot and carbon monoxide are released. In fact, many fossil fuels-including coal-burn incompletely, releasing waste products into the environment.

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A combustion reaction is a major class of chemical reactions, commonly referred to as "burning." In the most general sense, combustion involves a reaction between any combustible material and an oxidizer to form an oxidized product. It usually occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water.

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Physical change                 when we dissolve salt in water it is a physical change as we get back salt through evaporation to dryness. Chemical change           Burning a piece of paper is a chemical change as paper after burning convert into ash and is an irreversible process and a new product is formed that has different properties than its reactants.                   

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Physical change                 when we dissolve salt in water it is a physical change as we get back salt through evaporation to dryness. Chemical change           Burning a piece of paper is a chemical change as paper after burning convert into ash and is an irreversible process and a new product is formed that has different properties than its reactants.                   