The physical properties of a substance Essay

A physical alteration is one that affects merely the physical belongingss of a substance. while a chemical alteration alters a substance at the molecular degree.

Physical Properties: A belongings that can be observed or measured without altering the chemical individuality of the substance.

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Physical belongingss can be categorized as either intensive or extended.


An component or compound’s responsiveness is its ability or capacity to respond. or bond. with another substance. As you continue through this class. you will detect and compare this peculiar chemical belongings in a assortment of scenarios.


One type of chemical reaction. called burning. involves the combustion of assorted compounds and elements. Some substances are more combustible. or able to be burned. than other substances.

Oxidation province:

The difference in the figure of negatrons associated with an atom as a pure component as compared with that atom in a compound. An element’s electronegativity value and other belongingss affect its oxidization province in different compounds.


Some compounds decompose into more than one different component or compound as bonds are broken. Hydrogen peroxide ( H2O2 ) . a chemical you may hold around your house. is stored in a dark container to decelerate down decomposition. which can be caused by heat and visible radiation.

hints that can bespeak that a chemical alteration has occurred include: production of fires. colour alteration. bubbling or fizzing. fume. production of heat or visible radiation. and formation of a substance in a different province ( for illustration. a solid from the commixture of two liquids )

Chemical equations: a representation. utilizing expressions and symbols. of a chemical reaction. Reactants: The substances that are present at the beginning and undergo a chemical reaction. Merchandises: The new substances that are formed or produced by a chemical reaction. ( reactants?products )

– ( aq ) for aqueous solution

Law of Conservation of Mass: Matter is neither created nor destroyed during an ordinary physical alteration or chemical reaction.

–To balance a chemical equation. we use whole Numberss. called coefficients. written in forepart of the reactants and merchandises. A coefficient in forepart of a expression indicates the figure of molecules or formula units that take portion in the chemical reaction. The coefficients can besides stand for the mole ratio in which the compounds combine and form. Double Replacement Chemical reaction: A type of reaction in which the ions of two compounds exchange topographic points in an aqueous solution to organize two new compounds.

–Double replacing reactions normally occur in aqueous solutions. Remember that aqueous agencies dissolved in H2O and is represented by the inferior ( aq ) in the chemical expression. Because the reactants are dissolved in H2O. they are able to travel and clash together to organize new merchandises.

–In a single-replacement reaction. one component replaces a similar component in a compound. Most individual replacing reactions occur in aqueous solution. The general signifiers for a individual replacing reaction are shown below. A + BY > AY + B

Z + AX > AZ + X

Synthesis reactions. sometimes called composing reactions. affect two or more reactants uniting to organize one new substance. This means that in a synthesis equation. you will see two or more reactants on the left side of the equation. and merely one merchandise formed on the right side of the equation. A general equation for synthesis reactions can be represented by the followers: A + B > AB

In this equation. A and B can stand for elements or compounds. and AB represents a compound made of two or more elements.

Types of synthesis reactions: Metallic element with a nonmetal. Two nonmetals. Metal oxide with H2O. Nonmetallic oxide with H2O

A decomposition reaction is the antonym of a synthesis reaction ; it starts with merely one reactant but ends with more than one merchandise. Most decomposition reactions require energy. normally in the signifier of heat or electricity. to be added in order for the reaction to happen. In a decomposition reaction. a individual compound undergoes a reaction that produces more than one merchandise. The undermentioned general equation illustrates decomposition reactions: AB > A + B

AB is a compound made of two or more elements. A and B are single elements or compounds.

Types of Decomposition Reactions: Binary compound. metal carbonate. metal chlorate. metal hydrated oxide. oxygen acids In a burning reaction. a compound or element reacts with O. let go ofing a big sum of energy in the signifier of visible radiation and heat. –they are exothermal. which means that energy is released by the reaction.

Many burning reactions involve the combustion of organic compounds called hydrocarbons. compounds incorporating the elements C and H. or other organic compounds. When a hydrocarbon is burned wholly. the merchandises of the burning reaction are normally carbon dioxide and H2O. Natural gas. propane. and wood all burn to bring forth C dioxide and H2O as the merchandises.

Not all burning reactions involve organic compounds made of C and H ( nonorganic compounds ) . which means that the merchandises are non ever carbon dioxide and H2O. Other substances. both compounds and elements. can fire in O. These reactions can frequently be categorized as synthesis reactions. but they are considered combustion reactions every bit good because a substance is responding with O and let go ofing energy.

Stoichiometry is the usage of dimensional analysis to cipher relationships between the sums of reactants and merchandises in chemical reactions. ( stoichion. which means component. and metron. which means measure. ) Restricting Reactant: The reactant that controls the sum of merchandise able to be produced by a chemical reaction because it is used up wholly. Excess reactant: the reactant that is non used up wholly in a chemical reaction. Theoretical Output: The maximal sum of merchandise that can be produced by a given sum of reactant ( s ) .

The mensural sum of a merchandise really obtained from a reaction is called the existent output.

Percent Output: The ratio of the existent output to the theoretical output. multiplied by 100 to do it a per centum.

percent output = ? 100 %


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