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Chemical formula

Example: Balanced Chemical Equations with Subscripts Water: $$\ce{H2O}$$ Carbon dioxide: $$\ce{CO2}$$ Iron(III) hydroxide (Rust reaction): $$\ce{4Fe + 3O2 + 6H2O -> 4Fe(OH)3}$$ Copper(II) sulfate pentahydrate: $$\ce{CuSO4 * 5H2O}$$ Chemical Formulas in Chemistry Chemical formulas are the symbolic representations of chemical substances. They show the elements present in a compound and the ratio in which the atoms of these elements combine. Chemical formulas are essential for understanding the composition, structure, and behavior of compounds in chemical reactions. 1. What is a Chemical Formula? A chemical formula uses symbols of elements and numerical subscripts to represent the composition of a substance. For example, the formula for water is: $$ \ce{H2O} $$ This indicates that each water molecule is made up of 2 atoms of hydrogen and 1 atom of oxygen. 2. Types of Chemical Formulas Empirical Formula Molecular Formula Structural Formula...
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chemical equation and reaction

Fill in the Blanks: Chemical Equations and Reactions

1. The reaction in which two or more substances combine to form a single product is called a __________ reaction.


2. The chemical formula of quicklime is __________.


3. In a chemical reaction, the substances which react are called __________.


4. The chemical change in which heat is evolved is known as __________ reaction.


5. When iron nails are dipped in copper sulfate solution, a __________ displacement reaction occurs.


6. A reaction in which a compound breaks down into two or more simpler substances is called a __________ reaction.


7. The formation of a white insoluble solid in a reaction is called a __________ reaction.


8. The chemical equation must be balanced to satisfy the law of conservation of __________.


9. Rusting of iron is a __________ and __________ reaction.


10. The reaction between an acid and a base to form salt and water is called a __________ reaction.


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Answers:

1. Combination


2. CaO


3. Reactants


4. Exothermic


5. Single


6. Decomposition


7. Precipitation


8. Mass


9. Slow, oxidation


10. Neutralization
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