Properties and Changes in Matter Chapter 20

Chapter 20 Notes Physical Property A_____________________ that you can observe without changing or trying to change the composition of the substance.A_____________________ that you can observe without changing or trying to change the composition of the substance. How something __________________________________________ are all examples of physical properties.How something __________________________________________ are all examples of physical properties. You can detect many physical properties with your ____________________You can detect many physical properties with your ____________________ _____________________ is a measurement of how much matter an object contains._____________________ is a measurement of how much matter an object contains. _____________________ is a measurement of force._____________________ is a measurement of force. Weight depends on the mass of the object and on gravity. _____________________measures the amount of mass in a given volume._____________________measures the amount of mass in a given volume. __________________________________________ _____________________ is the ability of one substance to dissolve into another substance._____________________ is the ability of one substance to dissolve into another substance. _____________________=The temperature at which a solid changes into a liquid._____________________=The temperature at which a solid changes into a liquid. _____________________=The temperature at which a liquid changes into a gas._____________________=The temperature at which a liquid changes into a gas. A __________________________________________is a characteristic that cannot be observed without altering the substance.A __________________________________________is a characteristic that cannot be observed without altering the substance. Chemical Properties ____________________________________________________________ Physical Changes A __________________________________________ is one in which the form or appearance if matter changes, but not its composition.A __________________________________________ is one in which the form or appearance if matter changes, but not its composition. _____________________ is the process by which matter changes from a liquid state to a gas._____________________ is the process by which matter changes from a liquid state to a gas. _____________________is the process where a gas changes into a liquid._____________________is the process where a gas changes into a liquid. _____________________is the process in which a solid changes directly into a gas._____________________is the process in which a solid changes directly into a gas. _____________________is the process in which a gas changes into a solid._____________________is the process in which a gas changes into a solid. Chemical Changes Chemical Changes occur when substances are _____________________ into different substances.Chemical Changes occur when substances are _____________________ into different substances. Signs of Chemical Changes Chemical vs. Physical During a _____________________ change the composition of the substance _____________________change.During a _____________________ change the composition of the substance _____________________change. During a _____________________change the composition of the substance _____________________changeDuring a _____________________change the composition of the substance _____________________change

Chemical Properties ____________________________________________________________ Physical Changes A __________________________________________ is one in which the form or appearance if matter changes, but not its composition. _____________________ is the process by which matter changes from a liquid state to a gas. _____________________is the process where a gas changes into a liquid. _____________________is the process in which a solid changes directly into a gas. _____________________is the process in which a gas changes into a solid. Chemical Changes Chemical Changes occur when substances are _____________________ into different substances. Signs of Chemical Changes Chemical vs. Physical During a _____________________ change the composition of the substance _____________________change. During a _____________________change the composition of the substance _____________________change

Physical Property A characteristic that you can observe without changing or trying to change the composition of the substance.

Physical Property How something looks, smells, sounds, or tastes are all examples of physical properties.

Physical Properties You can detect many physical properties with your senses.

Mass Mass is a measurement of how much matter an object contains.

Weight Weight is a measurement of force. Weight depends on the mass of the object and on gravity. No matter where you are in the universe your mass never changes, but your weight can.

Density Density measures the amount of mass in a given volume. Density= mass/volume D= m/v

Solubility Solubility is the ability of one substance to dissolve into another substance.

Melting Point The temperature at which a solid changes into a liquid.

Boiling Point The temperature at which a liquid changes into a gas.

Magnetism Magnetism is a physical property

Chemical Property A chemical property is a characteristic that cannot be observed without altering the substance.

Chemical Properties Examples of chemical properties: Flammability, rusting, reacting with substances.

Physical Changes A physical change is one in which the form or appearance if matter changes, but not its composition.

Changing State Vaporization is the process by which matter changes from a liquid state to a gas.

Changing State Condensation is the process where a gas changes into a liquid.

Changing State Sublimation is the process in which a solid changes directly into a gas. Ex. Dry Ice

Changing State Deposition is the process in which a gas changes into a solid.

Chemical Changes Chemical Changes occur when substances are changed into different substances.

Signs of Chemical Changes Color Change is an example of chemical change.

Signs of Chemical Changes Another sign of a chemical change is the release or gain of energy by an object. Sodium in Trash Can Sodium in Water

Signs to Chemical Changes The changes in odor is a clue to chemical change.

Signs of Chemical Changes The production of bubbles is a sign that a chemical change has taken place.

Signs of Chemical Changes Another sign of chemical change is formation of a solid.

Chemical Change The substances produced during a chemical change cannot be changed back into the original substance by physical means.

Chemical vs. Physical During a physical change the composition of the substance does not change. During a chemical change the composition of the substance does change

Conservation of Mass Law of conservation of mass states that mass is neither created nor destroyed. As a result, the mass of the substances before a physical or chemical change is equal to the mass of the substances present after the change.