Given equation balanced equation type of reaction 1. fes + hcl → fecl2 + h2s a. fes + 2hci - feci2 + h2s b. 2. na + f2 → naf a. b. 3. hgo → hg + o2 a. b. answer questions 4 and 5 on a separate sheet of paper. 4. describe in words the reaction represented by the equation and include a description of the composition of each kind of molecule. 2 h2 + o2 → 2 h2o 5. use the law of conservation of mass to explain why the equation in question 4 is balanced. matching 6. chemical equation . 7. decomposition reaction 8. coefficient 9. product 10. reactant 11. synthesis reaction 12. replacement reaction 13. conservation of mass a. substance present after a reaction b. reaction in which substances combine to form a more complex compound c. principle that states that matter is not created or destroyed during a chemical reaction d. reaction in which one element replaces another in a compound e. substance present before a reaction f. number telling how many molecules of a substance are involved in a chemical reaction g. reaction in which compounds are broken down into simpler substances h. uses symbols and formulas to show chemical reactions

Answer :

1.  Given equation :

(a) Balanced Equation  :

(b) Type of Reaction  : Double-displacement reaction :  It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

2.  Given equation :

(a) Balanced Equation  :

(b) Type of Reaction  : Synthesis reaction : It is a type of reaction in which substances combine to form a more  complex compound.

3.  Given equation :

(a) Balanced Equation  :

(b) Type of Reaction  : Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

Answer 4 :

The given balanced chemical reaction is,

from the given reaction, we conclude that two moles of hydrogen gas molecule react with the one mole of oxygen gas molecule to give product as two moles of water molecule.

Answer 5 :

Law of conservation of mass : It states that in a chemical reaction, the mass of reactant molecules must be equal to the mass of product molecule.

Mass of reactant molecule =

Mass of product molecule =

The mass of reactant molecule is equal to the mass of product molecule.  This reaction follow law of conservation of mass. So, this reaction is balanced reaction.

Matching :

Answer 6 :

Chemical equation : Uses symbols and formulas to show chemical reactions.

Answer 7 :

Decomposition  reaction : Reaction in which compounds are broken down into  simpler substances.

Answer 8 :

Coefficient : Number telling how many molecules of a substance are  involved in a chemical reaction.

Answer 9 :

Product : Substance present after a reaction.

Answer 10 :

Reactant : Substance present before a reaction.

Answer 11 :

Synthesis reaction : Reaction in which substances combine to form a more  complex compound.

Answer 12 :

Replacement reaction : Reaction in which one element replaces another in a  compound.

Answer 13 :

Conservation of mass : Principle that states that matter is not created or destroyed during a chemical reaction.