Warm Up 1. 2. 3. 4. 5. What is the freezing point of the substance? What is the melting point of the substance?
What is the boiling point of the substance? At what temperature does the substance condense? What phase will the substance exist in at 60C? 6. Does it take more energy to melt the solid or boil the liquid?
1. The phase of matter with an indefinite 2. 3. 4. 5. shape but a definite volume is
_______________. The phase of matter that takes both the shape and volume of its container is _____________. The phase of matter that has a definite shape and definite volume is _________________. Which phase changes are endothermic? Which phase changes are exothermic?
If you were asked to describe an orange to someone who had never seen an orange, what would you tell the person? Come up with 5 adjectives or descriptions you would give Remember
Matter: has mass and takes up space Physical Properties Physical property: can be observed without altering the chemical identity of a substance Properties of Matter
Ask yourself, Would I have to change this substance into a new substance in order to view the property? Yes No Physical Properties (definition)
Chemical Properties (definition) States Characteristics Examples Chemical Changes
Physical Changes (definition) Changes of State (Phase Change examples) Examples Signs of Change Signs of Change
Physical Properties Characteristics Examples: color, texture, malleability, solubility, mass, volume, density, length, melting/freezing point, boiling point, Viscosity: ability to flow viscosity, ductility Ductility: bendable; shape
a wire Solubility:into ability to dissolve in water Malleability: capable of being shaped or formed, by hammering Chemical
Properties Chemical property: describes the ability of a substance to change into one or more new chemical substances. Can only be observed by changing the chemical identity of a substance Chemical
Properties Examples: Toxicity, reactivity, flammability, combustibility, radioactivity, rotting, tarnishing, acidity, alkalinity Chemical vs. Physical Properties Ask yourself, Would I have to change this
substance into a new substance in order to view the property? #1 The boiling point of a certain alcohol is 75 degrees Celsius
Physic al #2 Copper forms green copper carbonate when in contact with moist
air Chemic al #3 Table salt dissolves in water
Physic al #4 Copper is a good conductor of heat and electricity
Physic al #5 Magnesium burns brightly when ignited Chemic
al #6 Iron is more dense than aluminum Physic al
Physical vs. Chemical Changes 1. How do you calculate density? Substan Density ce 2. What is the unit for density ? Air 0.00129
Gasoline 0.70 Water 1.0 3. An object has a mass of 54g 2.7 and a volume of 20cm3. What is Aluminum Zinc 7.0 its density?
Silver 10.5 Platinum 21.4 4. A substance has a mass of 100kg and a volume of 100L. What is its density? Physical or Chemical Properties?
1. Everything is made of 2. 3. 4. 5. 6. ___________________________________. Chemicals can react to form new
__________________________. There is________ times as much hydrogen as there is oxygen in water. When you mix vinegar and baking soda it produces _________________ gas. A pyrotechnic is the name of a person who uses or manufactures ____________________. Potassium can be found in _______________________.
Whats the Difference? Matter can change Examples: Freeze, cut, burn, etc. 2 types of changes 1. Physical changes 2. Chemical changes Physical Changes Matter changes form WITHOUT becoming
something new You start and end with same thing (see below) Examples: cutting, phase changes, etc. Molecules in Physical Changes Chemical Changes
Identity of the matter changes, becomes NEW substance Start and end with different things Usually irreversible (cant change back) Examples: burning, rusting, milk going sour Formation of bubbles (a gas)
Soured milk Burning Tarnishing / Rusting In a chemical change, atoms and molecules rearrange to make new substances
Reactants: starting substances in a reaction Products: the resulting substances in a reaction
Chemical Reaction Demo NaHCO3 + C2H4O2 Baking Soda and Vinegar C2H3NaO2 + H2O + CO2 Sodium Acetate,
water, and carbon dioxide Signs of Change Physical Size Shape Chemical Temperature change Color change
Bubbles/fizzing- a gas is being formed Smoke Smell Light produced Sound Precipitate formed- solid particles formed when two liquids are mixed
Clues a Chemical change has occurred: Gas formation (bubbling or fizzing) Solid forms (precipitate )
Sound Color change Heat or light produced Is it a chemical or physical change?
Sugar dissolving in tea Physical Change Is it a chemical or physical change? Logs burning Chemical Change
Is it a chemical or physical change? Breaking water up by separating it into hydrogen and oxygen Chemical Change Is it a chemical or physical change? Cutting paper
Physical Change Is it a chemical or physical change? Crushing an aspirin Physical Change
Is it a chemical or physical change? Metal rusting Chemical Change Is it a chemical or physical change? An egg rotting Chemical Change
Is it a chemical or physical change? Melting ice Physical Change Is it a chemical or physical change? An egg breaking Physical Change
Is it a chemical or physical change? A candle burning Chemical Change Is it a chemical or physical change? Butter melting
Physical Change Is it a chemical or physical change? Water boils Physical Change Is it a chemical or physical change? Baking bread
Chemical change Is it a chemical or physical change? Burning a match Chemical Change Is it a chemical or physical change? Pancakes cooking
Chemical Change Acids & Bases What are Acids? Acids are common Some are dangerous and
can burn your skin Some are safe to eat and drink Stomach acid helps digest food Feel squeaky explosion
Acids Definition A group of compounds which behave similarly All have low pH Turn Litmus paper RED Examples Hydrochloric acid HCl Sulfuric acid H SO 2
4 Nitric acid HNO 3 Acetic Acid What are Bases (Alkalis)? In our home we often use bases to clean things. Eg Bleach
and toothpaste Feel slippery Some things are not acids or bases, we say that they are neutral. Eg Water Bases Definition A family of compounds that behave similarly
Have a high pH Turn litmus BLUE All donate OH- Examples Ammonia NH 3 Sodium Hydroxide NaOH Soaps
Measuring acid strength? To decide if something is an acid or a base we can use an indicator. Litmus and Universal Indicator are examples of indicators. They change color depending on if they are in an acid or a base. Working with Indicators
Red litmus turns BLUE in the presence of Bases Blue litmus turns RED in the presence of acid Acids and bases react together in a NEUTRALISATION reaction
Properties and Changes Stations At each station you will complete practice for each of the concepts we learned. When you show me your work you can progress to the next station. You must get through each station before the end of the class period at least once. Stations
Phase Change Diagrams Density Physical and Chemical Properties Physical and Chemical Changes Acids and Bases Acids & Bases In your INB draw a T chart. Label one side acids and the other side bases. Based on the properties of the items & what
you already know about acids and bases, classify the each as an acid or a base. Glue the acids on one side of a paper and the bases on the other. Explain why you classified each object as an acid or base. Acids and Bases round 2 http://amrita.olabs.co.in/?
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