PHYSICAL AND CHEMICAL PROPERTIES 7 TH GRADE NOTES/LECTURE PGS

DO NOW TOGETHER… (WITH YOUR LAB GROUP)  Imagine you are at a fair/carnival. Describe what you are experiencing with your senses (see, touch, taste, hear and smell.)  Check True/False Activity

OBJECTIVES Students will…  Identify physical and chemical properties of matter  Classify objects based on physical properties

PHYSICAL PROPERTIES  A physical property is a characteristic that you can observe without changing or trying to change the composition of the substance.  Examples of physical properties might be how something looks, smells, sounds or tastes. (Use your senses!)

PHYSICAL PROPERTIES  To describe a sample of matter, you need to identify its state. (solid, liquid, gas). Name some examples of each state of matter. SolidLiquidGas

PHYSICAL PROPERTIES FOLDABLE FOR NOTES  We will be creating a foldable describing the physical properties of matter.  Create foldable according to teacher instructions.  Physical Properties fall into 2 categories: Size-Dependent and Size-Independent.

SIZE DEPENDENT PROPERTIES  Size-Dependent Properties rely on the size of the object. ( 3 properties)  1) Volume: the amount of space in an object  2) Mass: the amount of matter in an object  3) Weight: depends on the mass and the strength of gravity

SIZE-INDEPENDENT PROPERTIES  Size-Independent Properties DO NOT rely on the size of an object. (7 properties)  1) Density: the amount of mass in a given volume  2) Solubility: amount of a substance that will dissolve another substance  3) Melting point: temperature at which a solid changes into a liquid

SIZE-INDEPENDENT PROPERTIES  4) Boiling Point- temperature at which a liquid turns into a gas  5) State of Matter- whether a substance is a solid, a liquid or a gas.  6) Magnetic Properties: can or cannot attract a magnet  7) Color: wavelength of light reflected

TO REVIEW  Properties of Matter Properties of Matter  For Next Time…  Test signed by tomorrow  Bring in one or two objects from home that can be used to describe physical properties of matter  Examples: a book, toy, figurine, food wrapper etc…

PHYSICAL AND CHEMICAL PROPERTIES 7 TH GRADE NOTES PGS PHYSICAL PROPERTIES ACTIVITY

DO NOW…  Describe the physical properties of a baseball. (Hint: state, shape, texture, color, mass etc…) Properties of Matter

OBJECTIVES  Students will… Identify physical properties of certain substances Explore chemical properties of matter Describe physical properties of known everyday objects

PHYSICAL PROPERTIES OF SPECIFIC SUBSTANCES SubstanceState Density (g/cm) Melting point © Boiling point © Solubility in cold water (g/100mL) Ammonia Bromine Calcium Carbonate Iodine Potassium Hydroxide Sodium Chloride Water

CHEMICAL PROPERTIES  Chemical Properties are characteristics that cannot be observed without alternating or changing the substance.  It is the ability of a substance to undergo a change the alters its identity.

PHYSICAL PROPERTIES OF OBJECTS Object Picture of Object ColorShapeSmellTextureState

FOR REVIEW  Physical vs. Chemical Properties Physical vs. Chemical Properties  For Next Time…  Each lab group needs to bring in for lab on Monday: egg, piece of fruit, a vegetable, baggie of dry cereal and a slice of bread. (divide up among members!)