Bell Work – write question, answer and explanation
Presentation on theme: "Vocabulary chapter 18, section 1 and 2 Page 528 and words"— Presentation transcript:
1Vocabulary chapter 18, section 1 and 2 Page 528 and 540 10 words HomeworkVocabulary chapter 18, section 1 and 2 Page 528 and words
2Bell Work – write question, answer and explanation 9-24-11 A substance is mixed into a solution. If there is no chemical reaction, what will happen when the liquid is evaporated out of the mixture?The container will be emptyThe container will have residue of the solid that was originally dissolvedThe mixture cannot evaporateNone of the above
3HomeworkRead ch. 18 section 1: Page 528 to 539 Answer questions 1-5 at the end of the section (p 539) GET TEST PAPER SIGNED!!!
4Bell Work – write question, answer and explanation 9-28-11 Carbonation is mixing a gas into a liquid such as when soda pop drinks are made. Which answer is correct? Explain your answer.This is a chemical changeThis is a physical changeGas cannot be mixed into a liquidThe gas is the solvent and the liquid is the solute of the solution
5HomeworkRead chapter 18 section 2: Page 540 to 546 Answer questions 1-5 at the end of the section (p 546) QUIZ TOMORROW
6Anything that has mass and takes up space. STUFF! What is Matter?Anything that has mass and takes up space.STUFF!
7What instrument is used to measure mass? A balanceScales are used to measure weight.
8What are some examples of matter? List some……What about air, is it matter? Does it have mass?
9What are the three most common states of matter? 1. solid2. liquid3. GasLets demonstrate!!!!!!!!!See particle movement for each phase
10DemonstrationLets create our own Human Molecules Demonstration!!!
112 other states of matter….. Plasma(super excited and super hot atoms)*examples: neon signs, ball lightening, starsBose Einstein condensate(super unexcited and super cold atoms)See States of Matter
12The Water Cycle is an example of state changes in nature Water from Earth evaporates into water vaporBecause it heats upWater vapor condenses and forms cloudsBecause it cools downIt can become ice, snow or hail if it cools enoughWater precipitates as and it all starts over again!
14Can you name other state changes we observe? Chocolate in a hot car meltsSolid to liquidWill it become a solid again?Is it still chocolate?Then it is still the same substance so it is a physical change.What about cheese, plastic, popsicles…?
15The state of matter a substance is at room temperature is a physical property that can be used to identify the substance.What is water at room temperature?What is plastic at room temperature?What is helium at room temperature?
16What causes the states of matter to change? ENERGY…Heat added changes a solid to liquid to gasHeat taken away changes gas to liquid to solid
17What are the changes of matter called? Solid to liquid…..meltingLiquid to solid…..freezingLiquid to gas…..evaporationGas to liquid….condensationSolid to gas….sublimation
18What determines how fast the state of matter changes? Pressure and heatThe starting temperatureThe amount of the substance that undergoes changeThe amount of heat that is applied to the substanceThe surface area is another factor that determines how fast a substance will melt or boil.
19How do we describe matter? Physical propertiesChemical properties
20Physical propertiesProperties that do not change the chemical nature of the substanceLink
21Physical Property Description Color, Shape, Length, Mass Volume Amount of space an object takes upDensityD=m/vsolubilityAbility to DissolveBoiling pointAt 1 atmosphere water boils at: 100 oC Fahrenheit KFreezing point0 oC or 32 FahrenheitMelting PointPoint at which a solid becomes a liquidmagnetic
23ChromatographyChromatography is a method for separating substances in some mixtures.Different substances of the mixture have different solubility rates.If the substance is very soluble, it moves up the paper quickly.If the substance is less soluble, it creeps along very slowly.
24Physical Changes Observe some examples. What about solubility and phase changes?
25MixtureA mixture is made of two or more substances that come together, but DO NOT CHEMICALLY combine.Homogenous mixtures: are evenly mixedLike tea or KoolaideHeterogeneous mixtures: are unevenly mixedLike a pizza or salad
26SolutionA solution is a mixture in which the different particles are tiny and are mixed completely evenlyEXAMPLES:Liquid dissolved in liquid (sugar in water)Liquids dissolved in other liquids (water in alcohol)Gas dissolved in a gas (oxygen dissolved in the nitrogen in the air)Gas dissolved in a liquid (carbonated drink)
28What determines solubility? The temperature and the amount of the solvent
29What is the difference between solute and solvent Solute: The dissolved substance in a solution.( sugar and tea dissolved in water)Solvent: The dissolving agent in the solution, usually a liquid such as water.( Water is considered the universal solvent)
30PrecipitateAs the solution cools, the solute will fall out of the mixture.How is this similar to weather precipitation?
31SaturatedThis is when no more solvent can be dissolved in the solution
32Chemical PropertiesProperties that do change the chemical nature of matter.
33Chemical Property Description Ability to burn Ability to react with oxygenpH