Presentation on theme: "MatterSection 2 2-2-1 Physical Properties 〉 Physical properties are characteristics that can be observed without changing the identity of the substance."— Presentation transcript:
MatterSection 2 2-2-1 Physical Properties 〉 Physical properties are characteristics that can be observed without changing the identity of the substance.
MatterSection 2 2-2-2 Physical Properties, continued Physical properties can help identify substances.
MatterSection 2 2-2-3 Physical Properties, continued Physical properties can be observed or measured.
MatterSection 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
MatterSection 2 2-2-5 Physical Properties, continued –melting point: the temperature and pressure at which a solid becomes a liquid
MatterSection 2 2-2-6 Physical Properties, continued –boiling point: the temperature and pressure at which a liquid becomes a gas
MatterSection 2 2-2-7 Physical Properties, continued Physical properties help determine uses.
MatterSection 2 2-2-8 Physical Properties, continued Density is a physical property.
MatterSection 2 2-2-9 Physical Properties, continued –density: the ratio of the mass of a substance to the volume of the substance
MatterSection 2 2-2-10 Physical Properties, continued
MatterSection 2 2-2-11 Physical Properties, continued –common unit of density is g/cm 3
MatterSection 2 2-2-12 Physical Properties, continued Density is different from weight.
MatterSection 2 2-2-13 Math Skills Density If 10.0 cm 3 of ice has a mass of 9.17 g, what is the density of ice?
MatterSection 2 2-2-14 Math Skills 1. List the given and unknown values. Given: mass, m = 9.17 g volume, V = 10.0 cm 3 Unknown: density, D = ? g/cm 3
MatterSection 2 2-2-15 Math Skills, continued 2. Write the equation for density. density = mass/volume, or D = m/V
MatterSection 2 2-2-16 Math Skills, continued 3. Insert the known values into the equation, and solve.
MatterSection 2 Chemical Properties 〉 Why are flammability and reactivity classified as chemical properties?
MatterSection 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.
MatterSection 2 2-2-18 Chemical Properties, continued Flammability is a chemical property. –flammability: the ability to burn
MatterSection 2 2-2-19 Chemical Properties, continued Reactivity is a chemical property.
MatterSection 2 2-2-20 Chemical Properties, continued –reactivity: the capacity of a substance to combine chemically with another substance
MatterSection 2 2-2-21 Chemical Properties, continued Physical and chemical properties are different.
MatterSection 2 2-2-22 Chemical Properties, continued Physical properties can be observed without changing the identity of a substance.
MatterSection 2 2-2-23 Chemical Properties, continued Chemical properties can be observed only in situations in which the identity of the substance changes.