Matter Section 2 2-2-1 Physical Properties 〉 Physical properties are characteristics that can be observed without changing the identity of the substance.
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Matter Section 2
2-2-1 Physical Properties〉Physical properties are characteristics that can be observed without changing the identity of the substance.
Matter Section 2
2-2-2 Physical Properties, continued• Physical properties can help identify substances.
Matter Section 2
2-2-3 Physical Properties, continued•Physical properties can be observed or measured.
Matter Section 2
2-2-4 Physical Properties, continued
–Examples: shape, color, odor, texture, state, melting point, boiling point, strength, hardness, magnetism, the ability to conduct electricity or heat
Matter Section 2
2-2-5 Physical Properties, continued
–melting point: the temperature and pressure at which a solid becomes a liquid
Matter Section 2
2-2-6 Physical Properties, continued
–boiling point: the temperature and pressure at which a liquid becomes a gas
Matter Section 2
2-2-7 Physical Properties, continued
•Physical properties help determine uses.
Matter Section 2
2-2-8 Physical Properties, continued
•Density is a physical property.
Matter Section 2
2-2-9 Physical Properties, continued
–density: the ratio of the mass of a substance to the volume of the substance
Matter Section 2
2-2-10 Physical Properties, continued
massdensity ,
voor
lu
me
mD
V
Matter Section 2
2-2-11 Physical Properties, continued
–common unit of density is g/cm3
Matter Section 2
2-2-12 Physical Properties, continued
Density is different from weight.
Matter Section 2
2-2-13 Math SkillsDensity If 10.0 cm3 of ice has a mass of 9.17 g, what is the density of ice?
Matter Section 2
2-2-14 Math Skills1. List the given and unknown
values.
Given: mass, m = 9.17 g
volume, V = 10.0 cm3
Unknown: density, D = ? g/cm3
Matter Section 2
2-2-15 Math Skills, continued2. Write the equation for density.
density = mass/volume, or D = m/V
Matter Section 2
2-2-16 Math Skills, continued
3. Insert the known values into the equation, and solve. m
DV
3
9.17 g
10.0 cmD
Matter Section 2
Chemical Properties
〉Why are flammability and reactivity classified as chemical properties?
Matter Section 2
2-2-17 Chemical Properties
A chemical property describes how a substance changes into a new substance, either by combining with other elements or by breaking apart into new substances.
Matter Section 2
2-2-18 Chemical Properties, continued
• Flammability is a chemical property.–flammability: the ability to burn
Matter Section 2
2-2-19 Chemical Properties, continued
• Reactivity is a chemical property.
Matter Section 2
2-2-20 Chemical Properties, continued
–reactivity: the capacity of a substance to combine chemically with another substance
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2-2-21 Chemical Properties, continued
• Physical and chemical properties are different.
Matter Section 2
2-2-22 Chemical Properties, continued
Physical properties can be observed without changing the identity of a substance.
Matter Section 2
2-2-23 Chemical Properties, continued
Chemical properties can be observed only in situations in which the identity of the substance changes.
Matter Section 2
2-2-1 Review Questions
Define physical properties.
Matter Section 2
2-2-2 Review Questions
What can physical properties be used for?
Matter Section 2
2-2-3 Review Questions
List 12 examples of physical properties.
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2-2-4 Review Questions
Define melting point.
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2-2-5 Review Questions
Define boiling point.
Matter Section 2
2-2-6 Review Questions
What do physical properties help determine?
Matter Section 2
2-2-7 Review Questions
What kind of property is density?
Matter Section 2
2-2-8 Review Questions
Define density.
Matter Section 2
2-2-9 Review Questions
What is the formula for density?
Matter Section 2
2-2-10 Review Questions
What is the common unit for density?
Matter Section 2
2-2-11 Review Questions
Density and weight are the same. True or False
Matter Section 2
2-2-12 Review Questions
What is the density of a rock that has a mass of 40.0 g and a volume of 10.0 cm3.?
Matter Section 2
2-2-13 Review Questions
What does a chemical property describe?
Matter Section 2
2-2-14 Review Questions
List 2 chemical properties.
Matter Section 2
2-2-15 Review Questions
Define flamability.
Matter Section 2
2-2-16 Review Questions
Define reactivity.
Matter Section 2
2-2-17 Review Questions
Chemical and physical properties are different. True or False
Matter Section 2
2-2-18 Review Questions
What happens to the identity of a substance when physical properties are observed?
Matter Section 2
2-2-19 Review Questions
What happens to the identity of a substance when chemical properties are observed?
Matter Section 2
2-2-20 Review Questions
What happens to the identity of a substance when chemical properties are observed?
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