Chemical Reactions and Equations-Karteikarten | Quizlet

d

Which of the following is a product that can be formed by double-displacement reactions?

a. gas

b. precipitate

c. water

d. all of the above

d

Which of the following is NOT an example of a possible type of displacement reaction?

a. displacement of the metal in a compound by another metal.

b. displacement of the halogen in a compound by another halogen

c. displacement of the hydrogen in water by a metal species.

d. displacement of the hydrogen in water by a halogen

a

Which of the following is true about decomposition reactions?

a. Electricity may be used as the energy source.

b. Only two products can be formed.

c. Energy as heat must be added to start the reaction; then it must be removed.

d. both a and c

b

what type of chemical reaction results in a formation of a single product?

a. combustion

b. synthesis

c. decomposition

d. displacement

b

In the reaction

Zn(s) +H2SO4(aq) = ZnSO4(aq) +H2(g)

what element has been displaced?

a. Zn

b. H

c. S

d. O

c

In the activity series, the more active elements are found:

a. at the bottom.

b. in the middle.

c. at the top

d. both a and c

a

Which is true regarding the activity series?

a. It can be established through a series of experiments involving replacement reactions.

b. It is completely accurate in determining the outcomes of a chemical reaction.

c. it is useful for determining whether a decomposition reaction can occur.

d. more-reactive species fall to the bottom of the series.

a

What can you predict by using an activity series?

a. whether a certain displacement reaction can occur.

b. whether a chemical reaction will absorb energy.

c. the state of a product

d. the melting points of elements

b

if metal A is placed in an ionic solution containing metal B ions and no reaction occurs, then metal B is most likely:

a. a halogen

b. higher on the activity series.

c. not on the activity series.

d. a catalyst

d

If zinc replaces iron, iron replaces lead, and zinc replaces lead in a chemical reaction, the order of activity from most active to least active is:

a. lead, iron, zinc.

b. zinc, lead, iron.

c. iron, zinc, lead.

d. zinc, iron, lead.

a

A solution of calcium chloride, CaCl2, is mixed with flakes of an unknown metal. A reaction is observed. Which of the following is most likely to be true, given the outcome of this experiment?

a. the unknown metal is higher on the activity series than calcium.

b. Calcium is higher on the activity series than the unknown metal.

c. the unknown metal is higher on the activity series than chlorine.

d. the unknown metal has more electrons than calcium

c

Knowledge about what products are produced in a chemical reaction is obtained by

a. inspecting the chemical equation.

c. laboratory analysis.

b. balancing the chemical equation.

d. writing a word equation

d

A chemical reaction has NOT occurred if the products have

a. the same mass as the reactants.

b. more energy than the reactants.

c. less energy than the reactants.

d. the same chemical properties as the reactants

d

Which observation does NOT indicate that a chemical reaction has occurred?

a. formation of a precipitate

c. evolution of energy

b. production of a gas

d. change in total mass of substances

b

The word equation solid carbon + oxygen gas → carbon dioxide gas + energy, represents a chemical reaction

because

a. the reaction releases energy.

b. CO2 has chemical properties that differ from those of C and O.

c. the reaction absorbs energy.

d. CO2 is a gas and carbon is a crystal.

CO2 has chemical properties that differ from those of C and O.

c

In the unbalanced formula equation CO + O2 → CO2 + energy, energy

a. is absorbed.

c. is released.

b. can be considered a reactant.

d. Both a and b

b

The word equation for the formula equation shown is

C2H5OH + O2 → CO2 + H2O + energy

a. carbon dioxide + water → ethanol + oxygen + energy.

b. ethanol + oxygen → carbon dioxide + water + energy.

c. ethanol + oxygen + energy → carbon dioxide + water.

d. ethanol + oxygen + energy → carbon dioxide + water + energy

c

The state of matter for a reactant or a product in a chemical equation is indicated by a

a. coefficient before the formula.

c. symbol after the formula.

b. subscript after the formula. d. superscript after the formula

b

The reaction, C2H5OH + 3O2 ⎯⎯heat⎯→ 2CO2 + 3H2O, will occur most rapidly if

a. C2H5OH is a liquid and O2 is a liquid.

c. CO2 is a gas and H2O is a liquid.

b. C2H5OH and O2 are in close contact.

d. CO2 is a gas and H2O is a gas.

a

An insoluble solid produced by a chemical reaction in solution is called

a. a precipitate.

c. a molecule.

b. a reactant.

d. the mass of the product.

c

How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield

carbon dioxide and water?

a. oxygen

c. O2

b. O

d. O3

a

The products of the reaction, C2H5OH + 3O2 → 2CO2 + 3H2O have the same _____ as the reactants.

a. atoms.

c. molecules.

b. coefficients.

d. subscripts

b

After the correct formula for a reactant in an equation has been written, the

a. subscripts are adjusted to balance the equation.

b. formula should not be changed.

c. same formula must appear as the product.

d. symbols in the formula must not appear on the product side of the equation.

a

To balance a chemical equation, it may be necessary to adjust the

a. coefficients.

b. subscripts.

c. formulas of the products.

d. number of products.

b

A chemical equation is balanced when the

a. coefficients of the reactants equal the coefficients of the products.

b. same number of each kind of atom appears in the reactants and in the products.

c. products and reactants are the same chemicals.

d. subscripts of the reactants equal the subscripts of the products.

b

After the first steps in writing an equation, the equation is balanced by

a. adjusting subscripts to the formula(s).

b. adjusting coefficients to the smallest whole-number ratio.

c. changing the products formed.

d. making the number of reactants equal to the number of products.

B

A reaction of a hydrocarbon, in which carbon dioxide and water are produced, is classified as a

a. decomposition reaction.

b. combustion reaction.

c. double-displacement reaction.

d. synthesis reaction

d

In what kind of reaction do two or more substances combine to form a new compound?

a. decomposition reaction

b. ionic reaction

c. double-displacement reaction

d. synthesis reaction

c

The equation A + X → AX is the general equation for a(n)

a. combustion reaction.

b. ionic reaction.

c. synthesis reaction.

d. double-displacement reaction

a

In what kind of reaction does a single compound produce two or more simpler substances?

a. decomposition reaction

b. synthesis reaction

c. displacement reaction

d. ionic reaction

b

The reaction 2KClO3(s) → 2KCl(s) + 3O2(g) is a(n)

a. synthesis reaction.

b. decomposition reaction.

c. combustion reaction.

d. ionic reaction

a

In what kind of reaction does one element replace a similar element in a compound?

a. displacement reaction

b. combustion

c. decomposition reaction

d. ionic reaction

c

The equation A + BX → AX + B is the general equation for a

a. double-displacement reaction.

b. decomposition reaction.

c. displacement reaction.

d. combustion reaction.

c

The reaction Cl2(g) + 2KBr(aq) → 2KCl(aq) + Br2(l) is a(n)

a. synthesis reaction.

b. ionic reaction.

c. displacement reaction.

d. combustion reaction

c

What is the name of a list of elements arranged according to the ease with which they undergo certain

chemical reactions?

a. reactivity list

b. reaction sequence

c. activity series

d. periodic list

b

An element in the activity series can replace any element

a. in the periodic table.

b. below it on the list.

c. above it on the list.

d. in its group.

a

What can be predicted by using an activity series?

a. whether a certain chemical reaction will occur

b. the amount of energy released by a chemical reaction

c. the electronegativity values of elements

d. the melting points of elements

c

If metal X is lower than metal Y in the activity series, then metal X

a. replaces ions of metal Y in a solution.

b. is more active than metal Y.

c. is less active than metal Y.

d. forms positive ions more readily than does metal Y.

b

A precipitate forms in a double-displacement reaction when

a. hydrogen gas reacts with a metal.

b. positive ions combine with negative ions.

c. water boils out of the solution.

d. a gas escapes.

b

The production of a slightly soluble solid compound in a double displacement reaction results in formation of a ___

a. Gas

b. Precipitate

c. Combustion Reaction

d. Halogen

a

To balance a chemical equation it is permissible to adjust the __

a. Coefficients

b. Subscripts

c. Formulas of the products

d. Number of products

b

In a chemical equation, the symbol (aq) indicates that the substance is ____

a. Water

b. Dissolved in water

c. An acid

d. Insoluble

d

The tendency for a replacement reaction to occur increases as the ___

a. Interval between any two elements in the activity series decreases

b. Temperature decreases

c. Valence electrons are used up

d. Interval between any two elements in the activity series increases

a

The coefficients in a chemical equation ______

a. Indicate the number of moles of each substance that react

b. Show the number of grams of each substance that react

c. Are the molar masses of the substances

d. Show the valence electrons for each atom

b

If metal X is lower than metal Y in the activity series, then ___

a. X will replace ions of Y in solution

b. Y will replace ions of X in solution

c. Y will form oxides only indirectly

d. X will react with cold water

d

in a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds. This reaction is called a(n) ___

a. Synthesis reaction

b. Decomposition reaction

c. Single-replacement reaction

d. Double-replacement reaction

a

The use of a double arrow in a chemical equation indicates that the reaction ___

a. is reversible

b. requires heat

c. is written backward

d. has not been confirmed in the lab

c

You mix solution A with solution B in a beaker. Which of the following

observations does not help you prove that a chemical reaction has

occurred?

a. The beaker becomes warm.

b. You see gas bubble out of solution.

c. Solution A, solution B, and the mixture are all yellow.

d. None of the above; all help prove that a chemical reaction has

occurred.

d

In the reaction described by the word equation

sodium water → sodium hydroxide hydrogen gas

a. sodium hydroxide is a product.

b. sodium is a product.

c. water is a reactant.

d. Both (a) and (c)

a

Which of the following indicates that a chemical equation is balanced?

a. The numbers of atoms of each element are the same on both sides

of the equation.

b. All of the coefficients are the same.

c. The numbers of molecules on each side of the equation are equal.

d. The sums of the coefficients on each side of the equation are equal.

d

From a complete and correctly written chemical equation, you can

obtain the

a. chemical formulas of the reactants and products.

b. relative amounts of the reactants and products.

c. physical states of the reactants and products.

d. All of the above

d

To balance a chemical equation, you must

a. adjust the subscripts.

b. adjust the number of products.

c. adjust the number of reactants.

d. adjust the coefficients.

d

The formation of a solid product in a chemical reaction is represented

by the symbol

a. (aq). b. (g). c. (l). d. (s).

b

In the expression 3CO2, the numbers 3 and 2 are, respectively,

a. a subscript and a coefficient.

b. a coefficient and a subscript.

c. two subscripts.

d. two coefficients.

b

. What is the total number of molecules that is represented by the

following chemical equation?

NH4NO2 → N2 2H2O

a. 3 b. 4 c. 8 d. 16

a

In which type of reaction do two or more compounds react to form

one product?

a. synthesis

b. decomposition

c. combustion

d. single-displacement

d

Which of the following is true regarding single-displacement reactions?

a. Only one product is formed.

b. There is only one reagent.

c. It requires oxygen.

d. One element replaces another in a compound

d

Which of the following is true regarding double-displacement

reactions?

a. Two products are formed.

b. The ions of the two reactants must be exchanged.

c. A precipitate may form.

d. All of the above

d

. A mixture of propane and oxygen react to form carbon dioxide and

water. What type of chemical reaction is this?

a. synthesis

b. decomposition

c. double-displacement

d. combustion

b

What type of chemical reaction does the following chemical equation

represent?

2HCl(aq) Cr(s) → H2(g) CrCl2(aq)

a. composition

b. single-displacement

c. decomposition

d. double-displacement

d

Calcium carbonate, CaCO3, reacts to form calcium oxide, CaO, and

carbon dioxide, CO2. What type of reaction is this?

a. synthesis

b. replacement

c. combustion

d. decomposition

b

Metal X replaces the ions of metal Y from solution, but it cannot

replace the ions of metal Z from solution. The order these metals

should have in the activity series (from top to bottom) is

c

. In a single-displacement reaction, an element in the activity series

most likely can replace any element

a. above it on the list.

b. in the same group.

c. below it on the list.

d. in any other group.

b

. The activity series helps to predict

a. the amount of product formed by a chemical reaction.

b. whether or not a specific chemical reaction is possible.

c. the coefficients needed to balance a chemical equation.

d. the amount of energy needed to start a chemical reaction