intro to chemistry chap 7

FALSE

A net ionic equation shows all ionic species that are present in solution.

barium chloride.

A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of:

TRUE

A precipitate will form when you mix solutions of potassium chloride and lead nitrate.

FALSE

A precipitation reaction occurs when water is formed as a product.

FALSE

A precipitation reaction will occur when sodium chloride is mixed with potassium nitrate.

combustion reaction

A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of a(n):

gas evolution reaction

A reaction which forms a gaseous product is an example of a(n)________.

precipitation reaction.

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

TRUE

A spectator ion is one that does not actively participate in a chemical reaction

TRUE

A strong electrolyte solution contains ionic compounds that completely dissociate in water.

FALSE

All ionic compounds dissolve in water

PbCl2.

All of the following compounds are soluble in water EXCEPT:

FALSE

An acid-base reaction always produces a salt plus carbon dioxide.

FALSE

An aqueous solution is a homogeneous mixture of a substance with water and should be designated with the (l) abbreviation.

water with another compound dissolved in it.

An aqueous solution is:

FALSE

An insoluble compound will completely dissolve in water.

FALSE

An oxidation-reduction reaction must involve reaction with oxygen.

1 and 3 only

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)

the symbols and formulas of all reactants and products.

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

FALSE

Bubbles in water that appear during boiling show that a chemical reaction is occurring.

TRUE

Carbon dioxide gas is a product when an acid reacts with a carbonate or a bicarbonate.

FALSE

Cl-, Br-, and I- are mostly insoluble.

TRUE

Color change is evidence that a chemical reaction has occurred.

TRUE

Combustion reactions are a subcategory of oxidation-reduction reactions.

FALSE

Combustion reactions emit heat and so can be classified as endothermic.

Pb2+ + 2NO3 - + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3 -

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation?

Pb2+ + 2I- → PbI2(s)

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation?

PbI2

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which compound would not form ions in the complete ionic equation?

All the above ions are in the complete ionic equation.

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?

K+ and NO3-

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be present in the net ionic equation?

Pb2+, I -

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be spectator ions?

TRUE

Decomposition reactions usually require energy to initiate the reaction.

TRUE

Evidence of a redox reaction is when a substance reacts with elemental oxygen.

FALSE

Evidence of a redox reaction is when one substance transfers protons to another substance.

All of 1, 2, and 3

Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2 Na(s) + Cl2(aq) → 2NaCl(s) 3. 2 Mg(s) + O2(g) → 2 MgO

2

If you had an aqueous mixture that contained Ag+, K+, and Pb2+ cations, how many different solids could precipitate if a chloride solution was added?

TRUE

In an oxidation-reduction reaction, if one substance loses electrons, then another substance must gain electrons.

(s)

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

: FALSE

It has been shown that the ozone molecule (O3) can be formed when a single oxygen atom (O) adds to a molecule of oxygen (O2), so this type of reaction is known as a double displacement reaction.

TRUE

Li+, Na+, K+ and NH4+ compounds are soluble.

1 and 3 only

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

TRUE

Mixing HNO3 (aq) and NaHCO3 (aq) will produce carbon dioxide gas as a product.

FALSE

Mixing two aqueous solutions will always result in formation of a precipitate.

TRUE

One of the characteristics of an acid-base reaction is that this type of reaction forms water.

FALSE

Precipitation reactions always occur when two aqueous solutions are mixed.

Sodium chloride is insoluble in water.

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?

2Na + 2H2O → 2NaOH (aq) + H2 (g)

Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. Which equation below best describes the balanced equation for this reaction?

SO4^2-

The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution?

: FALSE

The following equation IS balanced: 2 C4H10O + 13 O2 → 8 CO2 + 10 H2O

FALSE

The following equation IS balanced: CH4 + 2O2 → CO2 + H2O

TRUE

The following equation IS balanced: HNO3 + NaHSO3 → NaNO3 + H2O + SO2

FALSE

The following reaction IS balanced: AgNO3 + 2NH4Cl → AgCl + (NH4)2NO3

TRUE

The following reaction IS balanced: BaCl2 + H2SO4 → 2HCl + BaSO4

FALSE

The formation of a gas is evidence of a chemical reaction while the emission of light is not.

TRUE

The formation of a new solid or gas is evidence of a chemical reaction

TRUE

The key to predicting a precipitation reaction is the formation of an insoluble compound from soluble compounds.

FALSE

The net ionic equation for the reaction of sodium hydroxide plus hydrochloric acid is

TRUE

The reaction 2 KClO3 → 2 KCl + 3 O2 would be correctly classified as a decomposition reaction.

FALSE

The reaction of baking soda and vinegar to produce carbon dioxide gas is an example of a precipitation reaction.

: FALSE

The reaction of carbonate ion with magnesium ion to form solid magnesium carbonate is an example of an oxidation reduction reaction.

TRUE

We remove the spectator ions from the complete ionic equation to form the net ionic equation.

2, 1, 1, 1

What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___H2

2, 3, 6, 1

What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3)2 → ___NaNO3 + ___Ba3(PO4)2

2, 1, 1, 2

What are the coefficients for the following reaction when it is properly balanced? ___O2 + ___CH4 → ___CO2 + ___H2O

1, 1, 1, 1

What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water

2, 2, 1, 2

What are the coefficients for the following reaction when it is properly balanced? ___nitrogen monoxide + ___carbon monoxide → ___nitrogen +___carbon dioxide

2, 1, 1, 2

What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate

carbon dioxide

What is the gas produced when hydrochloric acid is reacted with ammonium carbonate?

HCl + KOH → H2O + KCl

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

H+ + OH- → H2O

What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide?

gas evolution

What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution?

no reaction

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

precipitation

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

acid-base neutralization

What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution?

oxidation-reduction

What type of a reaction occurs when potassium metal reacts with fluorine gas?

PbSO4

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

Cl-(aq) + Ag+(aq) → AgCl(s)

When a solution of MgCl2 and one of AgNO3 are mixed, the net ionic equation is:

TRUE

When balancing a chemical equation you may alter the coefficients but not the subscripts in the equation.

TRUE

When compounds containing polyatomic ions dissolve, the polyatomic ions usually dissolve as intact units.

The NaCl will fail to dissociate.

When solid NaCl is stirred into water, which of the following is NOT true?

6

When the equation __Ca3N2 + __H2O → __Ca(OH)2 + __NH3 is balanced, the coefficient of H2O is:

4

When the equation __NO2 + __H2O + __O2 → __HNO3 is balanced, the coefficient of HNO3 is:

3

When the equation, ___N2 + ___H2 → ___NH3 is balanced, the coefficient of hydrogen is:

8

When the equation, ___O2 + ___C5H12 → ___CO2 + ___H2O is balanced, the coefficient: of O2 is:

No, boiling water is a physical change

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

K+

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)

K+

Which is a spectator ion from the following complete ionic equation: H+(aq) + Br-(aq) + K+ (aq) + OH-(aq) → H2O(l) + K+(aq) + Br- (aq)

aluminum sulfide

Which of the following compounds is INSOLUBLE?

magnesium phosphate

Which of the following compounds is INSOLUBLE?

aluminum sulfate

Which of the following compounds is SOLUBLE?

potassium carbonate

Which of the following compounds is SOLUBLE?

4NH3 + 14O2 → 4NO2 + 6H2O

Which of the following equations is NOT balanced properly?

soap

Which of the following everyday substances does NOT typically contain an acid?

none of the above

Which of the following is NOT an acid?

All of the above are evidence of a chemical reaction

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

absorbing light when chemicals are contacted with each other

Which of the following is NOT typically a sign of a chemical reaction?

When coefficients are added the type of compounds is changed in the chemical reaction.

Which of the following statements about balancing reactions is FALSE?

All of the statements are true.

Which of the following statements about writing molecular, complete and net ionic equations is FALSE?

hydroxides

Which of the following types of compounds will NOT undergo a gas evolution reaction when acid is added?

H2 (g)

Which of the following would NOT be a product from mixing hydrochloric acid with a solution of sodium sulfite?