Question 1

Which of the following is the correct balanced equation for the reaction between hydrogen and oxygen to form water?

Accepted Answer

$$2\ \mathrm{H_2$} + 1\ \mathrm{O_2$} \rightarrow 2\ \mathrm{H_2O}$$

Question 2

When balancing the equation $$\mathrm{Na} + \mathrm{Cl_2$} \rightarrow \mathrm{NaCl}$$, what is the correct set of coefficients?

Accepted Answer

$$2\ \mathrm{Na} + 1\ \mathrm{Cl_2$} \rightarrow 2\ \mathrm{NaCl}$$

Question 3

Which of the following best describes the law of conservation of mass as it applies to balancing chemical equations?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 4

In the reaction $$\mathrm{Mg} + \mathrm{O_2$} \rightarrow \mathrm{MgO}$$, what is the correct balanced equation?

Accepted Answer

$$2\ \mathrm{Mg} + 1\ \mathrm{O_2$} \rightarrow 2\ \mathrm{MgO}$$

Question 5

A student is asked to balance the equation $$\mathrm{Al} + \mathrm{O_2$} \rightarrow \mathrm{Al_2O_3}. $$Which set of coefficients is correct?

Accepted Answer

$$4\ \mathrm{Al} + 3\ \mathrm{O_2$} \rightarrow 2\ \mathrm{Al_2O_3}$$

Question 6

Which of the following is the correct balanced equation for the reaction $$\mathrm{K} + \mathrm{Br_2$} \rightarrow \mathrm{KBr}$$?

Accepted Answer

$$2\ \mathrm{K} + 1\ \mathrm{Br_2$} \rightarrow 2\ \mathrm{KBr}$$

Question 7

If you are given the unbalanced equation $$\mathrm{Fe} + \mathrm{O_2$} \rightarrow \mathrm{Fe_2O_3}$$, what is the correct balanced form?

Accepted Answer

$$4\ \mathrm{Fe} + 3\ \mathrm{O_2$} \rightarrow 2\ \mathrm{Fe_2O_3}$$

Question 8

Which of the following is the correct balanced equation for the combustion of methane: $$\mathrm{CH_4$} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$?

Accepted Answer

$$1\ \mathrm{CH_4$} + 2\ \mathrm{O_2$} \rightarrow 1\ \mathrm{CO_2$} + 2\ \mathrm{H_2O}$$

Question 9

In a chemical reaction, why must the number of atoms of each element be the same on both sides of the equation?

Accepted Answer

Because atoms are neither created nor destroyed in a chemical reaction.

Question 10

Which of the following is the correct balanced equation for the reaction $$\mathrm{NaOH} + \mathrm{H_2SO_4} \rightarrow \mathrm{Na_2SO_4} + \mathrm{H_2O}$$?

Accepted Answer

$$2\ \mathrm{NaOH} + 1\ \mathrm{H_2SO_4} \rightarrow 1\ \mathrm{Na_2SO_4} + 2\ \mathrm{H_2O}$$

Question 11

A student is balancing the equation $$\mathrm{$$CaCO_3$$} \rightarrow \mathrm{CaO} + \mathrm{CO_2$}. $$What is the correct set of coefficients?

Accepted Answer

$$1\ \mathrm{$$CaCO_3$$} \rightarrow 1\ \mathrm{CaO} + 1\ \mathrm{CO_2$}$$

Question 12

Which of the following is a correct real-world application of balancing chemical equations?

Accepted Answer

Calculating the amount of reactants needed to produce a specific amount of product in industrial chemical manufacturing.

Question 13

If a reaction produces water as a product, which of the following formulas correctly represents water?

Accepted Answer

$$\mathrm{H_2O}$$

Question 14

Which of the following is the correct balanced equation for the reaction $$\mathrm{C_2H_6} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$?

Accepted Answer

$$2\ \mathrm{C_2H_6} + 7\ \mathrm{O_2$} \rightarrow 4\ \mathrm{CO_2$} + 6\ \mathrm{H_2O}$$

Balancing Chemical Equations – Step-by-Step Guidance

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