- Slides: 24
Matter • Anything that has mass and takes up space (volume) Mass vs. Weight – Examples: • • A brick has mass and takes up space A desk has mass and takes up space A pencil has mass and takes up space Air has mass and takes up space All of the above examples are considered matter because they have mass and take up space. Can you think of anything that would not be considered matter?
Mass vs. Weight Mass • • Weight a measure of how much matter an object is made of does not change, regardless of where something or someone is Mass = 59 kg Weight = 579 N • • Why do you think the person’s weight is less on the moon? the force of gravity on an object equal to the mass of the body times the local acceleration of gravity Mass = 59 kg Weight = 96 N http: //www. exploratorium. edu/ronh/weight/index. html
5 Physical States of Matter • Bose-Einstein (Newest State) • Solid • Liquid • Gas • Plasma
Bose-Einstein Condensate • Exist at extremely cold temperatures (around absolute zero or -460 o. F) • Particles are super unexcited • Particles lock or “clump” together so firmly that they move as a single unit • Definite shape and volume (? )
Solid • Particles are tightly compact • Particles vibrate without the ability to move freely • Definite shape and volume • Solid Animation
Liquid • Particles are tightly compact, but able to move around close to each other • No definite shape, but definite volume • Liquid Animation
Gas • Particles can easily spread out or move close together • Particle move freely and with a lot of energy • No definite shape or volume • Gas Simulation
Plasma • Exist at extremely high temperatures (several million degrees Celsius) • Particles are broken apart • Particles move freely and with extremely high energy • This form is not too common on Earth, however it is the most common form of matter in the universe • No definite shape or volume (? ) • Examples: Florescent and neon lights, lightning, aurora borealis Why do you think this is the most common form/state of matter in the universe? + - + +-
Energy and the States of Matter • The physical states of matter result from the amount of energy the particles composing the matter have. Basically, more energy means more movement for the particles and less energy means less movement. • Energy/Temperature and Matter Simulations – Ph. ET – BEC: Temperature and Absolute Zero If you were to compare an ice cube and the steam created from boiling water, which would you think has more energy?
Why do you think Bose-Einstein and Changes in States plasma are not equally distanced from the other three states of matter? (Physical Changes) Plasma Ionization Disposition Recombination Vaporization (Evaporation/Boiling) Liquid Melting Solid Gas Condensation Freezing Sublimation Bose-Einstein All changes in state require a change in energy
Phase Changes Simulation • Ph. ET • Harcourt School • Pearson This is what happens when energy is added and/or taken away from matter
States of Matter Continuum What about this continuum could be considered a little misleading? Taken from: http: //www. chem 4 kids. com/files/matter_becondensate. html
Density • a measure of the amount of matter present in a given volume of a substance • typically expressed in the following units: – grams per cubic centimeter (g/cm 3) for solids – grams per milliliter (g/ml) for liquids • does not depend on how much of a substance you have (intrinsic property) – in other words, the density of a gold bar would be the same as the density of a gold flake • can change as temperature and pressure change Which do you think is more dense? Why?
Calculating Density • Density can be calculated by dividing the mass of an object by its volume D=m V Sample Problem Timothy found a solid metal block that has a mass of 100 grams and a volume of 25 cm 3. What would be the density of the block? grams = 4 grams D = 100 25 cm 3
The Density Triangle D V=m m = D. V D V m D . V
Practice Problems 1. Find the density of a substance with a mass of 27 g and a volume of 7 cm 3. D=m V 2. D = 27 g 7 cm 3 = 3. 86 grams cm 3 A block of maple has a mass of 20 grams and a volume of 26. 5 cm 3. What is the density of the block? D=m V D = 20 grams = 0. 75 grams 3 3 26. 5 cm cm
Chemical Change • a change in which a substance becomes another substance having different properties • a change that is not reversible using ordinary physical means • Changes that usually cause heat, sound, light, odor, fizzing/foaming, color changes You usually need more than one of the above characteristics to be considered a chemical change! • Examples combining sulfuric acid and sugar burning a piece of wood soured milk
Chemical or Physical Change? 1. Bending a Paper Clip Physical Change 2. Baking a cake Chemical Change 3. The sublimation of carbon dioxide Physical Change 4. Crushing an aluminum can Physical Change 5. Vinegar and baking soda combining to create salt and water Chemical Change
Physical Change • a change in shape, size, color, or state • a change without a change in chemical composition • a change that is reversible – The Mixtures Lab • Examples tearing paper cutting your hair change in state
Physical Properties of Matter • any property of matter that can be observed or measured without changing the identity of the matter • Examples color shape taste state/phase D=m density V
Chemical Properties of Matter • any property of matter that describes a substance based on its ability to change into a new substance • Examples flammability reactivity with vinegar reactivity with oxygen Iron + Oxygen Iron oxide (rust) 2 Fe + 3 O 2 Fe 2 O 3
Chemical or Physical Property? 1. Paper is white Physical Property 2. Boiling point of H 2 O is 100 o. C Physical Property 3. Zinc reacts with hydrochloric acid and creates hydrogen gas Chemical Property 4. Nitrogen does not burn Chemical Property 5. Sulfur smells like rotten eggs Physical Property
Comparing Physical and Chemical Properties Substance/Matter Physical Property Chemical Property Helium Less dense than air Nonflammable Wood Grainy texture Flammable Baking soda White powder Reacts with vinegar to produce bubbles Powdered sugar White powder Does not react with vinegar Rubbing alcohol Clear liquid Flammable Red food coloring Red color Reacts with bleach and loses color Iron Malleable Reacts with oxygen