Chem Test

The formation of a solid product in a chemical reaction is represented by the symbol

(s)

Which coefficients correctly balance the formula equationNH4NO2(s)® N2(g) + H2O(l)?

1,1,2

Which of the following equations represents the balanced equation for the reaction of iron and oxygen?

4Fe 3O2 2Fe2O3

When the equation Fe3O4 + Al ® Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?

9

The complete balanced equation for the reaction between zinc hydroxide and acetic acid is

C) Zn(OH)₂ + 2CH₃COOH -> Zn(CH₃COO)₂ + 2H₂O

Which of the following is true about decomposition reactions?

Electricity may be used as the energy source.

In the reaction Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g), what element has been displaced?

H

Which word equation represents the reaction that produces water from hydrogen and oxygen?

Hydrogen plus oxygen yields water.

In the chemical equation 2Mg(s) + O2(g) ? 2MgO(s),

Mg represents the regeant magnesium

.Using the activity series, determine which of the following reactions is possible.

Na(s) + H2O(l)

In the word equation, sodium oxide + water ® sodium hydroxide, the formula forsodium hydroxide is represented by

NaOH

A chemical formula written over the arrow in a chemical equation signifies

a catalyst for the reaction.

In the activity series, the more active elements are found

at the top.

The reaction 2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(l) is

combustion reaction.

The equation AX ® A + X is the general equation for a

decomposition reaction.

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

single displacement reaction

The Greek letter delta (D) above the arrow in a chemical equation means

the reactants are heated.

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

decomposition reaction

The reaction represented by the equation 2HgO(s) ® 2Hg(l) + O2(g) is a(n)

decomposition reaction.

The reaction represented by the equation 2KClO3(s) ® 2KCl(s) + 3O2(g) is a(n)

decomposition reaction.

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

displacement reaction

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

dissolved in water.

In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds?

double-displacement reaction

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

double-displacement reaction.

The reaction Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) is a

double-displacement reaction.

The reaction represented by the equation Pb(NO3)2(aq) + 2KI(aq) ® PbI2(s) + 2KNO3(aq) is a

double-displacement reaction.

The coefficients in a chemical equation

indicate the number of moles of each substance that react

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

is reversible.

What does CH4 represent in the balanced chemical equation shown below?C + 2H2 CH4

one molecule of CH4

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

precipitate

The reaction represented by the equation Cl2(g) + 2KBr(aq) ® 2KCl(aq) + Br2(l) is a(n)

single-displacement reaction.

The reaction represented by the equation Mg(s) + 2HCl(aq) ® H2(g) + MgCl2(aq) is a

single-displacement reaction.

What type of chemical reaction is represented by the following word equation?iron + oxygen iron(II) oxide

synthesis

What type of chemical reaction results in the formation of a single product?

synthesis

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

synthesis reaction.

Which coefficients correctly balance the formula equation CaO + H2O ® Ca(OH)2?

1, 1, 1

Which of the following equations represents a decomposition reaction?

2HgO(s) 2Hg(l) + O2(g)

Use the activity series to the right to answer the following questions.According to the activity series, which of the following single displacement reactions can occur?

3Ca(s) + Al2(SO4)3(aq)

What is the total number of molecules that is represented by the following chemical equation?NH4NO2 N2 + 2H2O

4

Which of the following is a product in the reaction described by the word equation below?iron + copper(II) sulfate iron(II) sulfate + copper

Both (a) and (b) - (iron (II) sulfate and copper)

In the reaction described by the word equation sodium + water sodium hydroxide + hydrogen gas

Both (a) and (c) - (sodium hydroxide is a product & water is a reactant.

Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?

C + O2 = CO2

If calcium is listed above magnesium in the activity series, and magnesium is listed above zinc, which of the following reactions is possible?

Ca(s) + MgCl2(aq)

Which of the following is true regarding the law of conservation of mass?

It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.

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

O2

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?

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

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

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

You have an unknown metal, X. You conduct two experiments. The results are shown in the table below. Procedure Result X(s) + NaCl(aq) no reaction X(s) + ZnCl2(aq) reaction of metal Which of the following statements is a logical conclusion based on the experimental data?

The unknown metal is higher on the activity series than zinc, but below sodium.

Which statement is true regarding the reaction represented by the following equation?Zn(s) + CdCl2(aq) ZnCl2(aq) + Cd(s)

Zinc must have a higher activity than cadmium.

When a solid produced by a chemical reaction separates from the solution it is called

a precipitate

From a complete and correctly written chemical equation, you can obtain the

all of the above

Which of the following may indicate that a chemical reaction has occurred?

all of the above

In a single-displacement reaction, an element in the activity series most likely can replace any element

below it on the list.

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

change in the total mass of substances

What is the small whole number that appears in front of a formula in a chemical equation?

coefficient

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

coefficients

Which set of coefficients will balance the equation below?NaOH + Cu(NO3)2 Cu(OH)2 + NaNO3

2,1,1,2

Which equation is not balanced?

2H2 + O2 --> H2O

Which reaction does not occur?

2HF(aq)+ Cl2(g) = F2(g) + 2HCl(aq)