CHAPTER 7 MILADY BARBERING
REVIEW QUESTIONS AND ANSWERS
Define organic and inorganic chemistry - Answer-Organic chemistry- is the study of
substances that contain the element carbon; all living things are made of compounds
that contain carbon.
Inorganic chemistry- is the study of substances that do not contain carbon but may
contain hydrogen.
List the three states of matter - Answer-Solid, liquid, and gas
Compare elements and atoms, compounds, and mixtures - Answer-Element
contains just one type of atom.
Compound contains two or more different atoms joined together.
Mixture contains two or more different substances that are only physically joined
together, not chemically.
Mixture can contain both elements and compounds.
Explain the two ways in which matter can be changed - Answer-Physical change:
change is physical properties of a substance without a chemical reaction or the
creation of a new substance
Chemical change: change is chemical composition or makeup of a substance
Explain oxidation-reduction (redox) reactions - Answer-Oxidation and reduction
always happens simultaneously; the oxidizing agent is always reduced and the
reducing agent is always oxidized
Name the four classifications of chemical compounds - Answer-oxides
acids
bases/alkalis
salts
Describe the differences between solutions, suspensions, and emulsions - Answer-
Solution: stable, uniform mixture of two or more mixable substances that is made by
dissolving a solid, liquid, or gaseous substance in another
Suspensions: unstable, uniform mixtures of two or more substances
Emulsions: physical mixture of two immiscible liquids held together by an emulsifying
agent
Define pH and draw a pH scale - Answer-Potential hydrogen relative degree of
acidity or alkalinity of a substance.
pH scale: measures concentration of hydrogen ions in acidic and alkaline water-
based solutions
REVIEW QUESTIONS AND ANSWERS
Define organic and inorganic chemistry - Answer-Organic chemistry- is the study of
substances that contain the element carbon; all living things are made of compounds
that contain carbon.
Inorganic chemistry- is the study of substances that do not contain carbon but may
contain hydrogen.
List the three states of matter - Answer-Solid, liquid, and gas
Compare elements and atoms, compounds, and mixtures - Answer-Element
contains just one type of atom.
Compound contains two or more different atoms joined together.
Mixture contains two or more different substances that are only physically joined
together, not chemically.
Mixture can contain both elements and compounds.
Explain the two ways in which matter can be changed - Answer-Physical change:
change is physical properties of a substance without a chemical reaction or the
creation of a new substance
Chemical change: change is chemical composition or makeup of a substance
Explain oxidation-reduction (redox) reactions - Answer-Oxidation and reduction
always happens simultaneously; the oxidizing agent is always reduced and the
reducing agent is always oxidized
Name the four classifications of chemical compounds - Answer-oxides
acids
bases/alkalis
salts
Describe the differences between solutions, suspensions, and emulsions - Answer-
Solution: stable, uniform mixture of two or more mixable substances that is made by
dissolving a solid, liquid, or gaseous substance in another
Suspensions: unstable, uniform mixtures of two or more substances
Emulsions: physical mixture of two immiscible liquids held together by an emulsifying
agent
Define pH and draw a pH scale - Answer-Potential hydrogen relative degree of
acidity or alkalinity of a substance.
pH scale: measures concentration of hydrogen ions in acidic and alkaline water-
based solutions
