Topic 2 Formulas & Equations Study Guide/Review Questions

In an experiment, 2.54 grams of copper completely reacts with sulfur, producing 3.18 grams of copper(I) sulfide. Determine the total mass of sulfur consumed.

0.64 g

Base your answer to the following question on the information below and on your knowledge of chemistry. The balanced equation below represents the reaction of glucose, C6H12O6, with oxygen at 298 K and 101.3 kPa. C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l) Determine the mass of CO2 produced when 9.0 grams of glucose completely reacts with 9.6 grams of oxygen to produce 5.4 grams of water.

13.2 g or for any value from 13.155 g to 13.2042 g

The reaction between aluminum and an aqueous solution of copper(II) sulfate is represented by the unbalanced equation below. Al(s) + CuSO4(aq) → Al2(SO4)3(aq) + Cu(s) Determine the total mass of Cu produced when 1.08 grams of Al reacts completely with 9.58 grams of CuSO4 to produce 6.85 grams of Al2(SO4)3.

3.81 g

Based on Reference Table J, which metal will not react with 1 M HCl? A) Au(s) B) Ni(s) C) Sn(s) D) Zn(s)

A) Au(s)

What is the empirical formula of a compound that has a carbon-to-hydrogen ratio of 2 to 6? A) CH3 B) C2H6 C) C3H D) C6H2

A) CH3

Which is a binary compound? A) CaCl2 B) KOH C) NaNO3 D) MgSO4

A) CaCl2

Which formula represents ammonium nitrate? A) NH4NO3 B) NH4NO2 C) NH4(NO3)2 D) NH4(NO2)2

A) NH4NO3

What is the chemical formula for sodium sulfate? A) Na2SO4 B) Na2SO3 C) NaSO4 D) NaSO3

A) Na2SO4

What is the chemical name of the compound NH4SCN? A) ammonium thiocyanate B) ammonium cyanide C) nitrogen hydrogen cyanide D) nitrogen hydrogen sulfate

A) ammonium thiocyanate

Every water molecule has two hydrogen atoms bonded to one oxygen atom. This fact supports the concept that elements in a compound are: A) chemically combined in a fixed proportion B) chemically combined in proportions that vary C) physically mixed in a fixed proportion D) physically mixed in proportions that vary

A) chemically combined in a fixed proportion

Given the balanced equation representing a reaction: 6Li + N2 → 2Li3N Which type of chemical reaction is represented by this equation? A) synthesis B) decomposition C) single replacement D) double replacement

A) synthesis

Base your answer to the following question on the information below. A tablet of one antacid contains citric acid, H3C6H5O7, and sodium hydrogen carbonate, NaHCO3. When the tablet dissolves in water, bubbles of CO2 are produced. This reaction is represented by the incomplete equation below. H3C6H5O7(aq) + 3NaHCO3(aq) Na3C6H5O7(aq) + 3CO2(g) + 3 _______ (l) State evidence that a chemical reaction occurred when the tablet was placed in the water.

Acceptable responses include, but are not limited to: • The reactants and products are different chemicals. • Bonds were broken and bonds were formed. • A gas was created.

Base your answer to the following question on the information below. A 1.0-gram strip of zinc is reacted with hydrochloric acid in a test tube. The unbalanced equation below represents the reaction. ____ Zn(s) + ____HCl(aq) ____H2(g) + ____ ZnCl2(aq) Balance the equation for the reaction of zinc and hydrochloric acid, using the smallest whole-number coefficients.

Answer:____ Zn(s) + __2__HCI(aq) ® ____H2(g) + ____ ZnCl2(aq)

Given the unbalanced equation: ___Al + ___CuSO4 → ___AL2(SO4)3 + ___Cu When the equation is balanced using the smallest whole-number coefficients, what is the coefficient of Al? A) 1 B) 2 C) 3 D) 4

B) 2

Given the balanced equation: X + Cl2 → C2H5Cl + HCl Which molecule is represented by X? A) C2H4 B) C2H6 C) C3H6 D) C3H8

B) C2H6

The molecular formula of glucose is C6H12O6. What is the empirical formula of glucose? A) CHO B) CH2O C) C6H12O6 D) C12H24O12

B) CH2O

Given the incomplete equation: 4Fe + 3O2 → 2X Which compound is represented by X? A) FeO B) Fe2O3 C) Fe3O2 D) Fe3O4

B) Fe2O3

What is the chemical formula of iron(III) sulfide? A) FeS B) Fe2S3 C) FeSO3 D) Fe2(SO3)3

B) Fe2S3

Which two solutions, when mixed together, will undergo a double replacement reaction and form a white, solid substance? A) NaCl(aq) and LiNO3(aq) B) KCl(aq) and AgNO3(aq) C) KCl(aq) and LiCl(aq) D) NaNO3(aq) and AgNO3(

B) KCl(aq) and AgNO3(aq)

What is the chemical formula for sodium sulfate? A) Na2SO3 B) Na2SO4 C) NaSO3 D) NaSO4

B) Na2SO4

The chemical formula for nickel (II) bromide is: A) Ni2Br B) NiBr2 C) N2Br D) NBr2

B) NiBr2

When PbI2(s) is added to Na2CO3(aq), a white precipitate is formed. According to Reference Table F, the white precipitate most likely is: A) KNO3 B) PbCO3 C) NaI D) Na2CO3

B) PbCO3

Which of the following best describes exothermic chemical reactions? A) They never release heat. B) They always release heat. C) They never occur spontaneously. D) They always occur spontaneously.

B) They always release heat.

Which precipitate does the following reaction form? Ba(NO3)2(aq) + Na2SO4(aq) 2 NaNO3(aq) + BaSO4(s): A) nitrogen B) barium sulfate C) barium nitrate D) soluble salt

B) barium sulfate

Which polyatomic ion contains the greatest number of oxygen atoms? A) acetate B) carbonate C) hydroxide D) peroxide

B) carbonate

A balanced equation representing a chemical reaction can be written using: A) chemical formulas and mass numbers B) chemical formulas and coefficients C) first ionization energies and mass numbers D) first ionization energies and coefficients

B) chemical formulas and coefficients

2 NH3(g) <-> N2(g) + 3 H2(g) What type of reaction is shown above? A) synthesis B) decomposition C) single replacement D) double replacement

B) decomposition

Which list includes three types of chemical reactions? A) decomposition, single replacement, and solidification B) decomposition, single replacement, and double replacement C) solidification, double replacement, and decomposition D) solidification, double replacement, and single replacement

B) decomposition, single replacement, and double replacement

Which equation shows conservation of atoms? A) H2 + O 2 → H2O B) H2 + O 2 → 2H2O C) 2H2 + O2 → 2H2O D) 2H2 + 2O2 → 2H2O

C) 2H2 + O2 → 2H2O

According to Reference Table J, which metal will react with 1 M PbCl2? A) Au(s) B) Ag(s) C) Co(s) D) Cu(s)

C) Co(s)

Given the incomplete equation for the combustion of ethane: 2C2H6+ 7O2 4CO2 + 6 ___ What is the formula of the missing product? A) CH3OH B) HCOOH C) H2O D) H2O2

C) H2O

What is conserved during a chemical reaction? A) energy, only B) matter, only C) both matter and energy D) neither matter nor energy

C) both matter and energy

A compound is a substance composed of two or more elements that are: A) physically mixed in a fixed proportion B) physically mixed in a variable proportion C) chemically combined in a fixed proportion D) chemically combined in a variable proportion

C) chemically combined in a fixed proportion

Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound? A) molecular formula B) condensed formula C) empirical formula D) structural formula

C) empirical formula

What is the correct name of Fe2O3? A) iron (I) oxide B) iron (II) oxide C) iron (III) oxide D) iron (V) oxide

C) iron (III) oxide

Given the equation representing a reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) Which type of chemical reaction is represented by the equation? A) synthesis B) decomposition C) single replacement D) double replacement

C) single replacement

Base your answer to the following question on the information below and on your knowledge of chemistry. During photosynthesis, plants use carbon dioxide, water, and light energy to produce glucose, C6H12O6, and oxygen. The reaction for photosynthesis is represented by the balanced equation below. 6CO2 + 6H2O + light energy → C6H12O6 + 6O2 Write the empirical formula for glucose.

CH2O

In an experiment, 2.54 grams of copper completely reacts with sulfur, producing 3.18 grams of copper(I) sulfide. Write the chemical formula of the compound produced.

Cu2S

What is the correct formula for ammonium carbonate? A) NH4(CO3)2 B) NH4CO3 C) (NH4)2(CO3)2 D) (NH4)2CO3

D) (NH4)2CO3

Which equation represents a conservation of atoms? A) 2Fe + 2O2 → Fe2O3 B) 2Fe + 3O2 → Fe2O3 C) 4Fe + 2O2 → 2Fe2O3 D) 4Fe + 3O2 → 2Fe2O3

D) 4Fe + 3O2 → 2Fe2O3

What is the total number of hydrogen atoms required to form 1 molecule of C3H5(OH)3? A) 1 B) 5 C) 3 D) 8

D) 8

What is the chemical formula for copper(II) hydroxide? A) CuOH B) CuOH2 C) Cu2(OH) D) Cu(OH)2

D) Cu(OH)2

The correct name of the compound with the formula PbO2 is: A) lead (I) oxide B) lead (II) oxide C) lead (III) oxide D) lead (IV) oxide

D) lead (IV) oxide

Balance the equation below, using the smallest whole-number coefficients. ____Al(s) + ____CuSO4(aq) → ____Al2(SO4)3(aq) + ____Cu(s)

_2__ Al(s) + __3__ CuSO4(aq) → ____ Al2(SO4)3(aq) + __3__Cu(s)

Identify the type of chemical reaction represented by the equation.

single replacement