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Activity-2 1

The document discusses chemical reactions, including definitions of key terms like reactants and products. It provides examples of chemical reactions and asks the reader to identify the reactants and products in each reaction. It also explains symbols used in writing chemical equations and asks the reader to write equations for reactions given.

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LEIANNE MAE DE GUZMAN
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158 views2 pages

Activity-2 1

The document discusses chemical reactions, including definitions of key terms like reactants and products. It provides examples of chemical reactions and asks the reader to identify the reactants and products in each reaction. It also explains symbols used in writing chemical equations and asks the reader to write equations for reactions given.

Uploaded by

LEIANNE MAE DE GUZMAN
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Name: ____________________________________ Score: __________________

Section: ___________________ Date: ___________________


Activity No. 2.1
CHEMICAL REACTION
Chemical reaction. A process in which a substance is changed into one or more new substance/s.
Chemical equation. An equation that uses chemical symbols and formulas to represent a chemical reaction
Reactants are the substances that enter into a chemical reaction.
Products are the resulting substances.
Precipitate. An insoluble solid that separates from the solution.
Antoine Lavoisier. Theory of Oxidation
EVIDENCES OF CHEMICAL REACTIONS
1. Production of light
2. Evolution of gas
3. Temperature change
4. Change in intrinsic properties (color, odor)
5. Formation of precipitate
Part A. The following are chemical reactions.
1. Iron reacts with copper sulfate (CuSO4 ) and forms iron (II) sulfate (FeSO4 ) and copper.
2. Magnesium combines with oxygen gas (O2 ) to produce magnesium oxide.
3. Hydrogen peroxide (H2O2 ) in the presence of manganese dioxide (MnO2 ) produces water and oxygen
gas.
4. Acetic acid (CH3 COOH) and sodium bicarbonate (NaHCO3 ) produce sodium acetate with the release of
carbon dioxide (CO2 ) gas and water.
5. Copper sulfate (CuSO4 ) reacts with sodium hydroxide (NaOH) to produce insoluble copper (II)
hydroxide Cu(OH)2 and sodium sulfate (Na2 SO4 ) solution.

Fill in the table below with the Reactants and Products from the chemical reactions above. Below each
number, write the symbol or formula of the reactant and product.

Reaction Reactants Products

5
Part B. Symbols used in Chemical Equation

Symbol Meaning
+ To show combination of reactants or products
To produce; to form; to yield
(s)-solid (l)-liquid (g)-gas (aq)-aqueous, substance is
(s), (l), (g), (aq)
dissolved in water
Reversible reaction
Heat Indicates that heat is supplied to the reaction

A formula written above or below the yield sign indicates


Pt its use as a catalyst or solvent

Write the chemical reaction using these symbols to complete chemical equation.

Reaction Chemical Equation

A Chemical equation is a chemist’s shorthand for a chemical reaction. The


equation distinguishes between the reactants, which are the starting materials
and the products which are the resulting substance/s. It shows the symbols or
formulas of the reactants and products, the phases (solid, liquid, gas) of these
substances, and the ratio of the substances as they react.

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