faithdixon
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1.)Which is the correctly balanced equation?

A. Cl2 + NaI à NaCl + I2
B. 2Cl2 + NaI à 2NaCl + I2
C. Cl2 + 2NaI à 2NaCl + I2
D. Cl2 + 2NaI à NaCl + 2I2

2. The following is an example of which type of reaction?
CH3OH + O2 → CO2 + 2H2O + heat

A. combustion
B. endothermic
C. substitution
D. spontaneous

3.Which of the following equations is balanced?
A. H2+ O2→H2O
B. 2H2 + O2→2H2O
C. 4H2 + O2→H2O + O
D. H2 + O2→H2O + O2

Respuesta :

Yna9141
A. The correctly balanced equation is that in which the number of atoms of a certain element at the left-hand side is similar to that in the right hand side or the reactant side and product side, respectively. From the given equation, the answer would be,

       C. Cl2 + 2NaI --> 2NaCl + I2


B. In the given chemical reaction above, heat is emitted such that it appears in the product side of the equation. Hence, this is an example of a combustion reaction. 

C. Similar with the reasoning in letter A, the answer to this item is,
          B. 2H2 + O2 --> 2H2O

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