Presentation on theme: "Matter- Anything that has mass and volume and takes up space"— Presentation transcript:
1 Matter- Anything that has mass and volume and takes up space 2.1Describing MatterMatter- Anything that has mass and volume and takes up spaceDifferent forms of matter have different properties that allow you to identify it.
2 Identifying Substances 2.1Identifying SubstancesA physical property is a quality or condition of a substance that can be observed or measured without changing the substance’s composition.Hardnesscolorboiling point/melting pointconductivity,texture,magnetic attractionmalleability
3 Ex. Mass, volume, length ect…. 2.1Describing MatterExtensive PropertiesAn extensive property is a property that depends on the amount of matter in a sample. Will change as the size of the sample changesEx. Mass, volume, length ect….
4 Ex. Temperature, color, molecular weight, density ect… 2.1Describing MatterIntensive PropertiesAn intensive property is a property that depends on the type of matter in a sample. Doesn’t change when you alter the size of a sampleEx. Temperature, color, molecular weight, density ect…Doesn’t matter how much water you have temp, color,density will not changeThis bowling ball and candlepin are used in a game played mainly in New England
5 2.4Chemical ChangesCHEMICAL PROPERTIESThe ability of a substance to undergo a specific chemical change is called a chemical property. Chemical properties can be used to identify a substance. But chemical properties can be observed only when a substance undergoes a chemical change. Ex. Flammability, reactivity, rusting
6 REVIEWLabel the following properties as intensive or extensive and if they are a physical or chemical propertyDensityColorMassMalleabilityCombustibility
7 2.1States of MatterStates of MatterWhat are three states of matter?
8 A solid is a form of matter that has a definite shape and volume. 2.1States of MatterSolidsA solid is a form of matter that has a definite shape and volume.The arrangement of particles is different in solids, liquids, and gases. In a solid, the particles are packed closely together in a rigid arrangement.
9 2.1States of MatterLiquidA liquid is a form of matter that has an indefinite shape, flows, yet has a fixed volume.The arrangement of particles is different in solids, liquids, and gases. In a liquid, the particles are close together, but they are free to flow past one another.
10 2.1States of MatterGasesA gas is a form of matter that takes both the shape and volume of its container.The arrangement of particles is different in solids, liquids, and gases. In a gas, the particles are relatively far apart and can move freely. Relating Cause and Effect Use the arrangements of their particles to explain the general shape and volume of solids and gases.
11 Physical Changes 2.1 How can physical changes be classified?
12 2.1Physical ChangesDuring a physical change the composition of the material does not change.As gallium melts in a person’s hand, the shape of the sample changes, but the composition of the material does not change.The silvery substance in the photograph is gallium, which has a melting point of 30°C. Inferring What can you infer about the temperature of the hand holding the gallium?
13 Physical changes can be classified as reversible or irreversible. 2.1Physical ChangesPhysical changes can be classified as reversible or irreversible.All physical changes that involve a change from one state to another are reversible.Cutting hair, filing nails, and cracking an egg are examples of irreversible physical changes.
14 During a chemical change, the composition of matter always changes. 2.4Chemical ChangesDuring a chemical change, the composition of matter always changes.Recall that during a physical change, the composition of matter never changes.
15 2.4Chemical ChangesA magnet separates iron from sulfur. This is an example of a physical change.A mixture of iron filings and sulfur can be changed. a) A magnet separates the iron from the sulfur. b) Heat combines iron and sulfur in a compound. Classifying Which change is a chemical change? Explain.
16 2.4Chemical ChangesA mixture of iron and sulfur is heated. The iron and sulfur react and form iron sulfide. This is an example of a chemical change.A mixture of iron filings and sulfur can be changed. a) A magnet separates the iron from the sulfur. b) Heat combines iron and sulfur in a compound. Classifying Which change is a chemical change? Explain.
17 A chemical change is also called a chemical reaction. 2.4Chemical ChangesA chemical change is also called a chemical reaction.One or more substances change into one or more new substances during a chemical reaction.A substance present at the start of the reaction is a reactant.A substance produced in the reaction is a product.
18 Recognizing Chemical Changes 2.4Recognizing Chemical ChangesPossible clues to chemical change include:a transfer of energya change in colorthe production of a gasthe formation of a precipitate.
19 Clues to chemical changes have practical applications. 2.4Chemical ChangesA precipitate is a solid that forms and settles out of a liquid mixture.Clues to chemical changes have practical applications.Clues to chemical change often have practical applications. a) Bubbles of carbon dioxide gas form when a geologist puts acid on a rock that contains compounds called carbonates. b) When a test strip is dipped in urine, the color change is used to estimate the level of the sugar glucose in urine. c) One step in the production of cheese is a reaction that causes milk to separate into solid curds and liquid whey.