Chem Chapter 7 Test

When the equation___Ca3N2 + ___H2O—> ___ Ca(OH)2 + ___ NH3 is balanced, the coefficient of H2O is:

Which of the following everyday substances doe NOT typically contain an acid? limes lemons soap vinegar

All of the following compounds are soluble in water EXCEPT: CaCL2 NH4Cl FeCl3 NaCl PbCl2

What type of reaction is the generic equation A + BC —> AC + B

What must be supplied for a decomposition reaction to happen? energy Heat Light Electrical current Any of the above

When the equation, ___N2 + ___H2—> ___ NH3 is balanced, the coefficient of hydrogen is

Which of the following compounds is SOLUBLE? Strontium carbonate Calcium carbonate Copper carbonate Potassium carbonate None of the above

Which of the following is NOT typically a sign of a chemical reaction? - emission of heat when chemicals are contacted with each other - emission of light when chemical are contacted with each other - absorbing heat when chemicals are contacted with each other -absorbing light when chemicals are contacted with each other -all of the above are signs of a chemical reaction

Which is a spectator ion from the following complete ionic equation: Ag+(aq) +NO3-(aq) + K+ (aq) + BR-(aq) —> AgBr(s) + K+(aq) + NO3-(aq)

As defined in the text, identify the "gas evolution" reactions among the following: 1. 2HCl(aq) + K2CO3(aq) —> H2O(l) + CO2(g) + 2KCl(aq) 2. CH4(g) + 2O2(g) — CO2(g) + 2H2O(l) 3. 2HCl(aq) +K2S(aq) —> H2S(g) + 2KCl(aq)

What is the molecular equation for the reaction of hydrochloride acid with potassium hydroxide?

What type of reaction is the generic equation AB—> A + B

Which of the following equations is NOT balanced properly? A)2NaHCO3-> Na2CO3 + CO2 +H2O B)2Cr + 6HCl —> 2CrCl3 + 3H2 C)Cr2(SO4)3 + 6KOH —> 2Cr(OH)3 + K2SO4 D)4Nh3 + 14O2 —> 4NO2 + 6H2O

Which of the following statements about balancing reactions is False? -When coefficients are added the type of compounds is changed in the chemical reaction. - Subscripts are multiplied by the coefficients to determine the number of atoms in a compound -If there is no coefficient or subscript, a one is implied -Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. -All of the above statements are true

Methane gas (CH4), on complete combustion in air, produces: 1. CO2 2. H2 3. H2O

What type of reaction occurs when a silver nitrate solution is mixed with sodium chloride solution?

What would be the formula of the precipitate that forms when Pb(NO3)2 (aq) and K2SO4 (aq) are mixed?

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) —> PbI2(s) + 2KNO3(aq) Which ion would NOT be present in the complete ionic equation? A) Pb 2+ B) I- C) K + D) NO3- E) all of the above ions are in the complete ionic equation.

Considering th following precipitation reaction: Pb(BO3)2(aq) + 2KI(aq) —> Pb I2(s) + 2KNO3(aq) Which ion(s) would NOT be spectator ions? A) Pb 2+, I - B) NO3 -, Pb 2+ C) K +, I - D) Pb 2+, NO3 - E) all the above ions are in the net iconic equation

When the equation, __ O2 + __C5H12 —> __CO2 + __H2O is balanced, the coefficient of O2 is:

Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. Which equation below best describes the balanced equation for this reaction? A) 2Na + H2O —> Na2OH(aq) + H(g) B) S+ H2O —> SOH(aq) + H(g) C) 2Na + 2H2O —> 2NaOH(aq) + H2(g) D) Na + H2O —> NaOH(aq) + H(g) E) Na + H2O —> NaOH(aq) + H2(g)

COnsidering the following précipitions reaction: Pb(NO3)2(aq) + 2KI(aq) —> PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be present in the net ionic question? A) K +, NO3 - B) K +, Pb 2+ C)K +, I - D) Pb 2+, NO3 - E) all the above ions are in the net ionic equation

When water is heated, bubbles form in th water. Is this evidence of a chemical reaction? Why?

In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products?

Several grams of sodium chloride are stirred into a glass of water and are no longer visible to the eye. Which of the following statements is FALSE? A) The sodium chloride solid has dissociated into its component ions. B) No precipitate has formed C)odium chloride is insoluble in water D) An aqueous solution has been prepared E) all of the statements are true

Which of the following is INSOLUBLE? A) magnesium sulfate B) magnesium iodide C) magnesium nitrate D) magnesium phosphate E) none of the above

When the equation, __NO2 + H2O + __O2 —>HNO3 is balanced, the coefficient of HNO3 is:

Identify the oxidation-reduction rections among the following: 1. Zn(s) + Cu 2+(aq) —> Zn 2+(aq) + Cu(s) 2. 2 Na(s) + Cl2(aq) —> 2NaCl(s) 3. 2 Mg(s) + O2(g) —> 2 MgO

What are the coefficients for the following reaction when it is properly balanced? __nitrogen monoxide + __ carbon monoxide —> __nitrogen + __carbon dioxide

Which of the following compounds s SOLUBLE? A) aluminum sulfate B) aluminum hydroxide C) aluminum sulfide D) aluminum carbonate E) none of the above

What type of reaction is the generic equation AB + CD —> AD + CB?

A reaction which forms a solid product is an example of a(n):

What type of reaction is the generic equation A + B —>AB?

Which of the following is NOT evidence that a chemical reaction occurred? A) émission of light when chemicals are contact with each other B) solid formation when chemicals are contacted with each other C) color change when chemicals are contacted with each other D) gas formation when the chemicals are contacted with each other E) all of the above are evidence of a chemical reaction

Which of the following compounds is INSOLUBLE? A) aluminum sulfide B) lithium carbonate C) potassium acetate D) magnesium bromide E) none of the above

When solid NaCl is stirred into water, which of the following is NOT true? A) individual sodium and chloride ions are present B) the solution will conduct electricity C) the NaCl will fail to dissociate D) the solution will taste salty E) non of the above

Identify the double displacement reactions among the following: 1. KCl(aq) + AgNO3(aq) —> AgCl(s) + KNO3(aq) 2. Na2SO4(aq) + BaCl2(aq) —> BaSO4(s) + 2NaCl(aq) 3. H2SO4(aq) + 2NaOH(aq) —> Na2SO4(aq) + 2H2O(l)

What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution?

Before a chemical equation can be rotten, one must know:

An aqueous solution is

A redox reaction has occurred when__

What are the coefficients for the following reaction when it is properly balanced? __O2 + __CH4 —> __CO2 + __H2O

A reaction hitch forms a gaseous product is an example of a(n)__

What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + __sodium hydroxide —> __sodium nitrate + __water=

What are the coefficients or the following reaction when it is properly balanced? __Na3PO4 +__Ba(NO3)2 —> __NaNO3 + __Ba3(PO4)2

When the equation, __O2 + __C6H14 —> __CO2 + __ H20 is balanced, the coefficient of O2 is:

WHat are the coefficients fo the flowing reaction when it is properly balanced? __HCl + __Mg —> __MgCl2 + __H2

What are the coefficients for the following reaction when it is properly balanced? __potassium iodide + __lead (II) acetate —> __lead(II) iodide + __potassium acetate

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) —> PbI2(s) + 2KNO3(aq) Which compound would not form ions in the omelette ionic equation? A) KNO3 B) KI C)PbI2 D) Pb(NO3)2 E) All compounds form ions in the complete ionic equation

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) —> PbI2(s) + 2KNO3(aq) What is the correct ionic equation? A) Pb 2+ + 2I - + PbI2(s) B) 2NO3 - + 2K + —> 2KNO3 C) Pb 2+ + 2NO3 - + 2K + + 2I - —> PbI2(s) + 2K + 2NO3 - D) Pb 2+ I2 - —> PbI2(s) E)none of the above

T/F: An aqueous solution is a homogenous mixture of a substance with water and should be designed with the (l) abbreviation

T/F: When compounds containing polyatomic ions dissolve, the polyatomic ions usually dissolve as intact units

T/F: Color change is evidence that a chemical reaction has occurred

T/F: Bubbles in water that appear during boiling show that a chemical reaction is occurring

T/F: Li +, Na +, K + and NH4 + compounds are soluble

T/F: Combustion reactions are a subcategory of oxidation-reduction reactions

T/F: The following reaction IS balanced: AgNO3 + 2NH4Cl —> AgCl + (NH4)2NO3

T/F: In an oxidation-reduction reaction, if on substance loses electrons, then another substance must gain electrons

T/F: Mixing two aqueous solutions will alway result in formation of a precipitate

T/F: An insoluble compound will completely dissolve in water