
Concept explainers
(a)
Interpretation:
Whether the following change is physical or chemical is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The change accompanied by the change in the physical properties only is classified as physical change. The substance remains the same before and after the change. For example, the melting of ice is a physical change.
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. For example, the burning of paper is a chemical change.
(a)

Answer to Problem 1.1P
The mixing of substances in A and B to give substance in C is a chemical change.
Explanation of Solution
The change is depicted as follows:
Each sphere represents one particle or atom. Atoms from A react with the atoms in B to form a new substance with one red and one blue atom depicted in the C. Formation of a new substance in a change is classified as a chemical change. Thus, the mixing of substances in A and B to give substance in C is a chemical change.
The particles in the A interact with the particles in B and result in the formation of new substance (change in composition). Therefore, it can be classified as a chemical change.
(b)
Interpretation:
Whether the following change is physical or chemical is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The change accompanied by the change in the physical properties only is classified as physical change. The substance remains the same before and after the change. For example, the melting of ice is a physical change.
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. For example, the burning of paper is a chemical change.
(b)

Answer to Problem 1.1P
The mixing of substances in A and B to give substance in D is a chemical change.
Explanation of Solution
The change is depicted as follows:
Each sphere represents one particle or atom. Atoms from A react with the atoms in B to form a new substance with one red and one blue atom depicted in the D. Formation of a new substance in a change is classified as a chemical change. Thus, the change is classified as a physical change. Therefore, the mixing of substances in A and B to give substance in D is a chemical change.
The particles in A interact with the particles in B and result in the formation of new substance (change in composition). Therefore, it can be classified as a chemical change.
(c)
Interpretation:
Whether the following change is physical or chemical is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The change accompanied by the change in the physical properties only is classified as physical change. The substance remains the same before and after the change. For example, the melting of ice is a physical change.
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. For example, the burning of paper is a chemical change.
(c)

Answer to Problem 1.1P
The conversion of substance C into D is a physical change.
Explanation of Solution
The change is depicted as follows:
Each sphere represents one particle or atom. C consists of molecules made up of one red sphere and one blue sphere. D also consists of molecules made up of one red sphere and one blue sphere. The only difference is in the arrangement of the particles in C and D. In C the particles are far apart from each other and are in the gaseous state whereas in D the particles are arranged in a regular pattern and in the solid state. Since no new substance is formed, therefore conversion of substance C into D is considered as a physical change.
The particles in C rearranged to give substance D. Since no new substance is formed the change is classified as a physical change.
(d)
Interpretation:
Whether the following change is accompanied by the change in physical properties or chemical properties is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The change accompanied by the change in the physical properties only is classified as physical change. The substance remains the same before and after the change. For example, the melting of ice is a physical change.
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. For example, the burning of paper is a chemical change.
(d)

Answer to Problem 1.1P
After the change in part (c) has occurred the sample have different physical properties.
Explanation of Solution
The change is depicted as follows:
Each sphere represents one particle or atom. C consists of molecules made up of one red sphere and one blue sphere. D also consists of molecules made up of one red sphere and one blue sphere. The only difference is in the arrangement of the particles in C and D. In C the particles are far apart from each other and are in the gaseous state whereas in D the particles are arranged in a regular pattern and in the solid state. Since no new substance is formed, therefore conversion of substance C into D is considered as a physical change.
The change is physical change, therefore, substance C and D will have the same chemical properties but different physical properties.
The particles in C rearranged to give substance D. Since no new substance is formed the substance C and D are the same therefore they will have the same chemical properties but different physical properties.
Want to see more full solutions like this?
Chapter 1 Solutions
Chemistry: The Molecular Nature of Matter and Change
- 19) Which metal is most commonly used in galvanization to protect steel structures from oxidation? Lead a. b. Tin C. Nickel d. Zinc 20) The following molecule is an example of a: R₁ R2- -N-R3 a. Secondary amine b. Secondary amide c. Tertiary amine d. Tertiary amidearrow_forwardpls helparrow_forwardIndicate the product of the reaction OH OH CH3-CC- Ph + H2SO4 a 20°C | CH3 Pharrow_forward
- 35) Complete the following equation by drawing the line the structure of the products that are formed. Please note that in some cases more than one product is possible. You must draw all possible products to recive full marks! a. ethanol + 2-propanol + H2SO4 → b. OH conc. H2SO4 CH2 H3C CH + K2Cr2O7 C. d. H3C A pressure CH3 + H2 CH Pt catalystarrow_forward21) The rate of reaction depends upon: a. the concentration and nature of reactants b. the temperature of the reaction C. whether or not a catalyst was used d. all of the above 22) A Maxwell-Boltzmann curve shows the distribution of molecular energies in a reaction system. When the temperature in this system is increased, the peak is a. higher and further to the right. b. higher and further to the left. c. lower and further to the right. d. lower and further to the left. 23) Which of the following correctly describes the reaction represented by the reaction below? CaCO3 (s) + energy → CaO (s) + CO2 (g) a. It is exothermic and the potential energy is greater in the reactants than the products. b. c. It is exothermic and the potential energy is greater in the products than the reactants. It is endothermic and the potential energy is greater in the products than the reactants. d. It is endothermic and the potential energy is equal for the products and reactants.arrow_forwardpls helparrow_forward
- 27) Draw the energy level diagram and write the full and shorthand electron configuration for a neutral sulfur atom.arrow_forwardIndicate whether these compounds are isomers, enantiomers, or tautomers. OCH OCH محمد ممدarrow_forward30) Substance A to E below are listed with several of their properties. The identities of the substances are identified in random order below: Iron, ethane, ethanol, sodium nitrate, graphite First classify each substance as either a polar covalent compound, non-polar covalent compound, ionic compound, metallic solid, or network solid. Write your predictions in the sixth coloumn of the chart, under "type of substance." Then, identify the identity of the substance in the last coloumn. Substance Melting Point Boiling Point Solubility in H₂O Electrical Conductivity Type of Substance Identity of Substance (°C) (°C) as: Solid, Liquids, Solution A -182 -88 Insoluble No/No/- B 1538 2862 Insoluble Yes/Yes/- C 308 380 Soluble Yes/Yes/Yes Ꭰ 3456 Insoluble No/-/- E -114 78 Soluble No/No/Noarrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY





