What is Matter?? Properties of matter

What is an example of Matter What is an example of Matter?? How do you know those are examples of matter??? Desk…Chair….Tree etc. Examples of matter because they have mass

What is Matter?? Matter is Anything that has mass and occupies space (volume) Composed of atoms MASS: The measured amount of material that makes up the object VOLUME: The 3D space taken up by the object Mass= amt of stuff Volume = 3D space taken up

The elephant has more MASS If you pulled each animal with the same amount of force, the elephant would respond less to pulling, even if he didn’t pull back at all. That’s because an elephant has more mass than a mouse. Mass stays the same no matter what force is acting on the object. This makes mass different from weight, which depends on both the amount of mass and the amount of gravity. This means that even though our elephant weighs less on the moon, his mass stays the same.

Building Blocks of matter ATOM: The smallest unit of an element. Atoms maintain the chemical identity of that element. Atom = smallest part of element help keep identity of the element

Building Blocks of matter ELEMENT: a pure substance that cannot be broken down into simpler STABLE substances and is made of one type of ATOM EXAMPLE: The element carbon is made up of many carbon atoms Element = pure substance cant be broken down mad of one type of atom

Building Blocks of matter COMPOUND: is a molecule that contains at least two different types of elements. A compound is a pure substance that can be broken down into simple stable substances. Compound = 2 or more elelments can be broken down

Classification of Matter Pure Substance The substance has the same composition throughout Does not vary from sample to sample Example: Elements and compounds Mixture Contains more than one substance Varies in composition & properties from sample to sample

Classfication Flowchart MATTER yes no Can it be physically separated? MIXTURE PURE SUBSTANCE Is the composition uniform? yes no Can it be chemically decomposed? no yes Examples: Water…Raison bran…carbon…air Heterogeneous Mixture (mechanical) Homogenous Mixture (solutions) Compound Element

Types of Mixtures Heterogeneous mixtures Visibly different parts Eg. Chocolate chip cookies; granite Two or more phases (usually) Homogeneous mixtures Different parts not visible (uniform throughout) One phase Eg. Sea water, air Hetero = raison bran….SPRITE…choc chip cookie Homo = alcohol…air…salty water

Heterogeneous Mixtures Have several different components that are visible to the eye Eg: Raisin Bran 9/18/2018

Homogeneous Mixtures Also known as solutions very small particles (0.2 – 2.0 nm) particles don’t settle to the bottom of the container Eg: rubbing alcohol, air, brass alloy

Pure Substances Elements A substance that cannot be separated into simpler substances Compound Two or more elements combined through a chemical reaction Compounds have different properties than elements they’re made of

Elements Students write this on their own periodic tables

Metals Metals: Usually solid at room temp Good conductors of heat and electricity High luster (shiny) Ductile – easily pulled into wires Malleable – easily beaten into thin sheets High melting point; high density Usually don’t combine with each other Readily combine with nonmetals

Non Metals Nonmetals: Solids (C, P, S, Se, I2); Liquid (Br2); Gases (all others) Poor conductors of heat and electricity; no luster Low melting point; low density Will combine with each other (CO2) Will combine with metals or metalloids Some found uncombined in nature (noble gases)

Metalloids Metalloids Have properties of both metals and nonmetals Some used for semiconductors in electronics Eg: Silicon, Germanium

Properties and Changes in Matter Characteristics that can help identify a substance You need to determine more than one property to conclude what the substance actually is Properties are either Extensive or Intensive Activity: strips of paper with random occurances….students must categorize them into groups. Do this before you teach properties

Extensive properties Intensive Properties Depend on the amount of matter that is present Volume Mass Energy Intensive Properties Do not depend on the amount of matter present Melting point Boiling point Density Ability to conduct electricity Ability to transfer heat Extensive: energy because more mass = more energy Intensive: Density….explain how sample of water has same amount of substance but can be compressed etc

Physical Properties Physical Property – A characteristic that can be observed or measured without changing the identity of the substance Describing the substance Melting point Boiling point Physical Change - A change in a substance that does not involve a change in the identity of the substance Grinding Cutting melting Have students give more examples

Chemical Properties Chemical Property- a characteristic that is observed while changing the original substance into a new substance. Wood burning When a substance decomposes in air When a substance will rust

Chemical Properties and Chemical Changes The reactants are the substances that react in a chemical change The products are the substances that are formed by the chemical change Carbon plus Oxygen yields (forms) Carbon Dioxide C + O2 CO2

The states of Matter Exists in three states on earth Solid Liquid Gas Exists in fourth state in space Plasma (An electrically neutral, highly ionized gas state)

Solids Definite shape and volume Particles tightly packed in a lattice pattern Crystalline – salt, sugar, quartz The particles are packed tightly in an uniform way by strong attractive forces Show cornstarch + water as amorphous solid Lowest energy

Liquids Definite volume Not a definite shape (Takes shape of container) Particles have more energy Particles can move freely Demo – water in two different containers

Gases Indefinite volume No definite shape(particles bounce off container) Particles have high energy level Particles move independently of one another Example of sulfur gas or perfume in one corner of room…will eventually fill entire room

Physical changes in the state of matter Changes in state does not change what the substance is…therefore it is considered a physical change not a chemical change Make sure students write down each change

Evidence of a Chemical Change Do a mini lab with these experiments after this slide

Energy and Changes of Matter

Chemical Formulas Subscript indicates # of atoms present H2O has 2 Hydrogen atoms and 1 Oxygen atom H2SO4 has NaOH has C6H12O6 has 2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 1 sodium atom, 1 oxygen atom, 1 hydrogen atom 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms

Separating Mixtures Do NOT cause chemical changes Heterogeneous Mixtures Filtration 9/18/2018

Separating Mixtures Homogeneous Mixtures Distillation 9/18/2018

Separating Mixtures Homogeneous Mixtures Chromatography 9/18/2018

Separating Mixtures Homogeneous Mixtures Crystallization 9/18/2018