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### What is a chemical equation?

Chemical Equation is a khung of describing a chemical reaction in which the name of each chemicalsubstance will be replaced by their chemical symbol.

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In the Chemical Equation, the arrow direction represents the direction in which a reaction occurs.For one-way reactions, we"ll show by an arrow from left to lớn right.So the substances on the left will be involved, & the one on the right will be the product.

### Balanced Equation Definition

A balanced equation is a chemical reaction equation in which the total charge & thenumber of atoms for each element in the reaction are the same for both the reactants & the components.In other words, the mass & charge on both sides of the reaction are equal.

### Examples of Unbalanced and Balanced Equations

The reactants and products of a chemical reaction are listed in an unbalanced chemical equation,but the quantities needed to lớn fulfil the conservation of mass are not specified.This equation, for example, is unbalanced in terms of mass for the reactionbetween iron oxide and carbon to size iron and carbon dioxide:

Fe2O3 + C → sắt + CO2

Since there are no ions on both sides of the equation, the charge is balanced (net neutral charge).On the reactants part of the equation (to the left of the arrow), there are two iron atoms,but only one on the products side (right of the arrow).You can say the equation isn"t balanced even though you don"t count the other atoms" quantities.On both the left and right sides of the arrow, the aim of balancing the equation is khổng lồ get the same numberof each kind of atom. This is accomplished by altering the compound coefficients (numbers placed in front of compound formulas).Subscripts (small numbers on the right of certain atoms, such as iron and oxygen in this case) are never altered.

The balanced equation is:

2 Fe2O3 + 3 C → 4 sắt + 3 CO2

### What is a substance in chemistry?

Observe, all that is visible, including our own bodies, are objects.There are natural objects such as animals, plants, rivers, soil ... Are artificial objects.

Natural objects consist of a number of different substances. Và artificial objects are made up ofmaterials.Every material is a substance or a mixture of some substances. For example: Aluminum, plastics,glass, ...

### What are their properties?

Each substance has certain properties: state or size (solid, liquid, gas) color, odor & taste.Calculation or insoluble in water ...Melting point, boiling point, specific gravity, electrical conductivity, etc.

And the ability lớn transform into other substances, for example, the ability to lớn decompose, run ...is the chemical properties.

### What is atom?

All substances are made up of extremely small, electrically neutral particles called atoms. Thereare tens of millions of different substances, but only over 100 types of atoms.

The atom consists of a positively charged nucleus and a shell made up of one or more negativelycharged electrons

### Most popular equation

Combination reaction

Also known as a synthesis reaction.One kind of frequently occurring combination reaction is the reaction of an element with oxygen to form an oxide. Under certain conditions, metals & nonmetals both react readily with oxygen. Once ignited, magnesium reacts rapidly và dramatically, reacting with oxygen from the air khổng lồ create a fine magnesium oxide powder.

C2H2 + CH3COCH3 → CHCC(CH3)2OH Hg + S → HgS sắt + S → FeS C2H2 + co + H2O → C2H3COOH Na2O + SO2 → Na2SO3 C + O2 → CO2 2Mg + O2 → 2MgO View All Combination reaction
Decomposition reaction

Many decomposition reactions involve heat , light, or electricity to đầu vào energy.Binary compounds are compounds which consist of only two elements. The simplest sort of reaction lớn decomposition is when a binary compound breaks down into its elements. Mercury (II) oxide, a red solid, decomposes to size mercury and oxygen gas when heated.Also, a reaction is regarded as a decomposition reaction even if one or more of the products are still a compound. A metal carbonate breaks down to form a metal oxide & carbon dioxide gas. Calcium carbonate for example decomposes into calcium oxide and carbon dioxide.

337,8" rel="canonical">NH4Cl → HCl + NH3 170" rel="canonical">2Cu(NO3)2 → 2CuO + 4NO2 + O2 Fe2(SO4)3 → Fe2O3 + 3SO3 H2CO3 → H2O + CO2 FeCl2 → Cl2 + fe 2HCl → Cl2 + H2 (NH4)2Cr2O7 → 4H2O + N2 + Cr2O3 View All Decomposition reaction
Oxidation-reduction reaction

An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Redox reactions are common và vital to lớn some of the basic functions of life, including photosynthesis, respiration, combustion, và corrosion or rusting.

HCl + K2S → H2S + KCl 2Ag + O3 → Ag2O + O2 3H2O + 3NH3 + Al(NO3)3 → Al(OH)3 + 3NH4NO3 3H2SO4 + K2Cr2O7 + SO2 → 3H2O + K2SO4 + Cr2(SO4)3 Cl2 + 2Li → 2LiCl Hg + S → HgS Cl2 + 2S → S2Cl2 View All Oxidation-reduction reaction
Single-replacement reaction

A + BC → AC + BElement A is a metal in this general reaction và replaces element B, a metal in the compound as well. If the replacement element is a non-metal, it must replace another non-metal in a compound, & it becomes the general equation.Many metals easily react with acids, and one of the reaction products when they do so is hydrogen gas. Zinc reacts to the aqueous zinc chloride and hydrogen with hydrochloride acid (see figure below).

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C6H5Cl + 2NaOH → C6H5ONa + H2O + NaCl sắt + H2SO4 → H2 + FeSO4 2Al + 3CuCl2 → 2AlCl3 + 3Cu CH3CH2CH2OH + C2H5COOH → H2O + C2H5COOCH2CH2CH3 NH3 + (CH3CO)2O → CH3COOH + CH3CONH2 CH3Br + KCN → KBr + CH3CN 2Mg + SiO2 → say đắm + 2MgO View All Single-replacement reaction