Question : 11.              In the figure shown, a chemical reaction occurring? A)No, because : 1335425

 

 

11.              In the figure shown, is a chemical reaction occurring?

A)No, because there are the same number of atoms in both images.

B)Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.

C)Yes, because the reactants are gases, but the product is a solid.

D)No, because there are oxygen atoms and nitrogen atoms in both images.

E)No, because both the reactants and products are colorless gases.

 

12.              In the figure shown, is a chemical reaction occurring?

A)No, because the Na+ and Cl? ions are simply being surrounded by the water molecules as the salt dissolves.

B)Yes, because the Na+ and Cl? ions are being removed from their ionic lattice as they are dissolved.

C)Yes, because the water molecules are reacting with the Na+ and Cl? ions to form a gas.

D)No, because there is no change occurring.

E)Yes, because a precipitate will be formed when the water and NaCl are mixed.

 

13.              In the figure shown, is a chemical reaction occurring?

A)No, because there are the same number of atoms in both images.

B)Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.

C)Yes, because the reactants are gases, but the product is a solid.

D)No, because there are oxygen atoms and carbon atoms in both images.

E)No, because both the reactants and products are colorless gases.

 

14.              Consider the following chemical equations.  Select the equations that represent chemical reactions, rather than physical changes.

I. CH4(g) + O2(g) ? CO2(g) + H2O(g)

II.  C2H5OH(l) ? C2H5OH(g)

III.  NaOH(s) ? Na+(aq) + OH?(aq)

A)I, II, and IIID)II and III only

B)I and II onlyE)I only

C)I and III only

 

15.              Consider the following chemical equations.  Select the equations that represent chemical reactions, rather than physical changes.

I. 2NO(g) + O2(g) ? 2NO2(g)

II.  CO2(s) ? CO2(g)

III.  Pb(NO3)2(aq) + 2AgCl(aq) ? PbCl2(s) + 2AgNO3(aq)

A)I, II, and IIID)II and III only

B)I and II onlyE)I only

C)I and III only

 

16.              Consider the following chemical equations.  Select the equations that represent chemical reactions, rather than physical changes.

I. KNO3(s) ? K+(aq) + NO3?(aq)

II.  2O3(g) ? 3O2(g)

III.  HCl(g) + NH3(g) ? NH4Cl(s)

A)I, II, and IIID)II and III only

B)I and II onlyE)II only

C)I and III only

 

17.              Write a complete, balanced equation for the reaction that occurs when sodium metal reacts with water to form hydrogen gas and aqueous sodium hydroxide.

A)Na(s) + H2O(l) ? NaOH(aq) + H(g)

B)Na(s) + H2O(l) ? NaOH(aq) + H2(g)

C)Na(s) + 2H2O(l) ? NaOH(aq) + 2H2(g)

D)Na(s) + 2H2O(l) ? 2NaOH(aq) + 2H2(g)

E)2Na(s) + 2H2O(l) ? 2NaOH(aq) + H2(g)

 

18.              Fireworks which give off bright flashes of white light often contain magnesium metal.  When the magnesium burns in the presence of oxygen, it forms solid magnesium oxide, and emits a bright white light.  Write a complete, balanced equation for this reaction.

A)Mg(s) + O2(g) ? MgO2(s)D)2Mg(s) + O2(g) ? 2MgO(s)

B)Mg(s) + O(g) ? MgO(s)E)4Mg(s) + O2(g) ? 2Mg2O(s)

C)Mg(s) + O2(g) ? MgO(s)

 

19.              Zinc metal will react with aqueous hydrochloric acid to produce aqueous zinc chloride and hydrogen gas.  Write a complete, balanced equation for this reaction.

A)Zn(s) + HCl(aq) ? ZnCl(aq) + H(g)

B)Zn(s) + HCl(aq) ? ZnCl(aq) + H2(g)

C)Zn(s) + 2HCl(aq) ? ZnCl(aq) + H2(g)

D)Zn(s) + 2HCl(aq) ? ZnCl2(aq) + H2(g)

E)2Zn(s) + 2HCl(aq) ? 2ZnCl(aq) + H2(g)

 

20.              When solid ammonium carbonate is heated, it decomposes to form ammonia gas, carbon dioxide gas, and water vapor, so that the solid completely disappears.  Write a complete, balanced equation for this reaction.

A)NH4CO3(s) ? NH3(g) + CO2(g) + H2O(g)

B)NH4CO3(s) ? NH2(g) + CO2(g) + H2O(g)

C)(NH4)2CO3(s) ? NH3(g) + CO2(g) + H2O(g)

D)(NH4)2CO3(s) ? NH3(g) + CO2(g) + 3H2O(g)

E)(NH4)2CO3(s) ? 2NH3(g) + CO2(g) + H2O(g)

 

 

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