Q: What is the correct balanced equation for the combustion of methane ($$CH_4) in $$oxygen?

$$CH_4(g) + 2O_2(g$$) \rightarrow $$CO_2(g) + 2H_2O(g$$) + \text{energy}$$

Question 1

Which of the following is NOT a sign that a chemical reaction has occurred?

Accepted Answer

A change in physical state without new substances forming

Question 2

What is the correct balanced equation for the combustion of methane ($$CH_4) in $$oxygen?

Accepted Answer

$$CH_4(g) + 2O_2(g$$) ightarrow $$CO_2(g) + 2H_2O(g$$) + 	ext{energy}$$

Question 3

Which of the following best describes a double replacement reaction?

Accepted Answer

Two compounds exchange ions to form two new compounds

Question 4

Balance the following equation: $$\_\_\_Al(s) + \_\_\_FeO(s) \rightarrow \_\_\_Fe(s) + \_\_\_Al_2O_3(s). $$What are the coefficients (in order from left to right)?

Accepted Answer

2, 3, 3, 1

Question 5

Which reaction type is represented by the following equation? $$2HgO(s) \xrightarrow{\Delta} 2Hg(l) + O_2$(g)$$

Accepted Answer

Decomposition

Question 6

A student mixes solutions of sodium sulfate and barium chloride and observes the formation of a white solid. What type of reaction has occurred?

Accepted Answer

Double replacement

Question 7

Which of the following equations is balanced?

Accepted Answer

$$2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)$$

Question 8

Which of the following best describes what happens in a single replacement reaction?

Accepted Answer

One element replaces another in a compound

Question 9

What is the correct set of coefficients to balance the equation: $$Fe_2O_3(s) + C(s) \rightarrow Fe(s) + CO_2$(g)$$?

Accepted Answer

1, 3, 2, 3

Question 10

Which of the following is a combination reaction?

Accepted Answer

$$Ca(s) + Cl_2$(g) \rightarrow $$CaCl_2$$(s)$$

Question 11

A candle burns in air, producing carbon dioxide and water. What type of reaction is this?

Accepted Answer

Combustion

Question 12

Which symbol in a chemical equation indicates that the reactants are heated?

Accepted Answer

$$\Delta$$

Question 13

What is the correct balanced equation for the reaction of aluminum with sulfuric acid to produce aluminum sulfate and hydrogen gas?

Accepted Answer

$$2Al(s) + 3H_2SO_4(aq) \rightarrow Al_2$(SO_4$)_3(aq) + 3H_2(g)$$

Question 14

Which of the following is a sign that a chemical reaction has occurred when potassium iodide is added to lead nitrate?

Accepted Answer

A yellow solid forms

Question 15

Which of the following best describes the products of a combustion reaction involving a hydrocarbon?

Accepted Answer

Carbon dioxide and water

Question 16

In the reaction $$Zn(s) + 2HCl(aq) \rightarrow H_2$(g) + $$ZnCl_2$$(aq)$$, what type of reaction is occurring?

Accepted Answer

Single replacement

Question 17

Which of the following is the correct balanced equation for the reaction between sodium phosphate and magnesium chloride?

Accepted Answer

$$2Na_3PO_4(aq) + 3MgCl_2(aq) \rightarrow Mg_3$(PO_4$)_2(s) + 6NaCl(aq)$$

Question 18

Which of the following is a decomposition reaction?

Accepted Answer

$$2HgO(s) \xrightarrow{\Delta} 2Hg(l) + O_2$(g)$$

Question 19

Which of the following is the correct meaning of the symbol $$(aq) in a $$chemical equation?

Accepted Answer

Aqueous (dissolved in water)

Chemical Equations, Reactions, and Equilibrium: Study Notes

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