Warm-up: 1. What is an element? 2. What is a compound?
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Transcript of Warm-up: 1. What is an element? 2. What is a compound?
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Warm-up:1. What is an element?2. What is a compound?
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1. Hydrogen2. Helium3. Lithium4. Boron5. Carbon6. Nitrogen7. Oxygen8.Neon9. Sodium10. Aluminum11. Silicon12. Sulfur13. Chlorine 14. Potassium15. Calcium
16. Titanium17. Iron18. Nickel19. Copper20. Tin21. Iodine22. Tungsten23. Gold24. Mercury25. Lead26. Radon
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Notes: Properties of Matter
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Matter is anything that has mass and takes up space.
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Elements and Compounds are PURE SUBSTANCES
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A mixture is when two or more substances are mixed together but not combined chemically
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A mixture retains properties of all original ingredients.
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MIXTURE OR PURE SUBSTANCE?
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MIXTURE OR PURE SUBSTANCE?
NaHCO3 - Sodium Bicarbonate
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MIXTURE OR PURE SUBSTANCE?
Soil
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MIXTURE OR PURE SUBSTANCE?
Milk
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MIXTURE OR PURE SUBSTANCE?
Sugar: C12H22O11
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MIXTURE OR PURE SUBSTANCE?
Air
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MIXTURE OR PURE SUBSTANCE?
Oxygen
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Homogeneous Mixtures are the same throughout.
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Warm-Up:1. Is H2O a _____________.
a. Elementb. Compoundc. Mixtured. All of the Above
2. Why is tap water considered a mixture?
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Steel is a homogeneous mixture.
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Heterogeneous Mixtures are not the same throughout.
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4 States of Matter:-Solid-Liquid-Gas -Plasma
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In a gas, molecules are very far apart
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In a liquid, molecules are closer together but still move around
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In a solid, molecules vibrate in place and do not move around
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Plasmas are gases that are so energized that some of their electrons have been stripped away
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Gasses and liquids take the shape of their containers, solids do not.
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Energy must be added to change a solid to a liquid;
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More energy must be added to change a liquid to a gas
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Warm-Up:
1. In which state of matter are the molecules moving the fastest?2. In which state of matter are the molecules not moving around, just vibrating in place?3. Matter in which two states takes the shape of its container?4. To make matter change from a solid to a liquid, what must happen to the molecules?
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WARM-UP: 1. Matter in which two states takes the shape of its container?2. To make matter change from a solid to a liquid, what must happen to the molecules?
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WARM-UP: 1. Which state of matter is the most dense?2. When a substance changes from a solid to a liquid what is this called?3. When a substance changes from a liquid to a gas what is this called?4. When a substance changes from a gas to a liquid, what is this called?
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WARM-UP: 1. What is volume? Give two examples of two things that have different volumes.2. What makes each element different from one another? 3. What is atomic number?
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1. What are the types of pure substances? 2. What are the types of mixtures?3. What is density? Describe two things that have different densities. 4. What combination of substances retains the properties of its components?
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5. Give an example of a homogeneous mixture. 6. Give an example of a heterogeneous mixture. 7. List the phases of matter in ascending order of density.8. What must be done to change a gas to a liquid?
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9. What is the phase change called when a solid changes directly to a gas?10. Is density a physical or chemical property of matter?11. Nitrogen boils at -196oC. Is this a physical or chemical property? 12. List these items in order of ascending density:-a bowling ball –a beach ball – a penny – a hot air balloon in the air
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Physical Properties of matter describe the matter’s physical characteristics
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Boiling/Melting Points
H2O = 1000C (2120F) CO2 = -570C (-700F)
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Density is a physical property
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Density = MassVolume
Practice: A material has a mass of 100g and a volume of 10 cm3.Calculate the density.
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Others include:-Thermal Conductivity
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-Malleability (ability to be pounded into thin sheets)
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-Ductility (ability to be drawn into a thin wire)
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Chemical Properties describe how a substance reacts chemically with another substance
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In a chemical reaction, you always get a new substance.
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Law of Conservation of Matter/Mass:Matter can never be created or destroyed
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Warm-Up: 1. Find the density of an object with a mass of 40g and a volume of 5 cubic cm.
2. Find the mass of a sample of a substance with a density of 5 g/ml and a volume of 2 ml
3. List three physical properties of H2O
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Solutions:
• S o l u t i o n s - A homogeneous mixture composed of only one phase
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Solutions:–S o l v e n t - the most abundant substance
in a solution. The solvent dissolves the solute.
–S o l u t e - the least abundant substance in a solution. The solute dissolves into the solvent.
– In a sugar water solution, water is the solvent & sugar is the solute.
– In steel (a solution which becomes a solid) iron is the solvent and carbon is the solute
– Air is a solution
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Solutions
• Homogeneous mixture • Mixed molecule by molecule • Can occur between any state of matter.
– Solid in liquid- Kool-aid – Liquid in liquid- antifreeze – Gas in gas- air – Solid in solid - brass – Liquid in gas- water vapor
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Concentration of Solution• Shows level of solute in the solvent• Can be Expressed in several ways
– Relative Concentrations• Dilute – small amounts of solute compared to solvent• Concentrated – large amounts of solute compared to
solvent– Levels of Concentration
• Unsaturated solution – is able to dissolve more solute• Saturated solution – has dissolved the maximum amount of solute• Supersaturated solution – has dissolved excess solute (at a higher
temperature). Solid crystals generally form when this solution is cooled.
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Percent Composition (by mass)• We can consider percent by mass (or weight percent, as
it is sometimes called) in two ways:• The parts of solute per 100 parts of solution.• The fraction of a solute in a solution multiplied by 100.• We need two pieces of information to calculate the
percent by mass of a solute in a solution: The mass of the solute in the solution.
• The mass of the solution.• Use the following equation to calculate percent by mass:
(Write the equation)
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Rate of Dissolving
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Factors Affecting How Fast a Solute Dissolves
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1. Temperature If we heat particles they will move faster
The solvent will carry the solute particles away faster
Hotter = Dissolve Faster
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2. Agitating Stirring or shaking a
solution moves the solute particles around so that they are closer to the solvent. The solvent particles can then attract them easily and carry them away!
Stir or Shake = Dissolve Faster
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3. Crushing (More Surface Area)
When a solute is broken into small pieces, the individual particles can get closer to solvent particles so they can be easily dissolved
So smaller pieces= dissolves faster
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Dissolving happens on the surface of particles
When solute is broken up, there is more surface area where dissolving can occur
broken up
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4. Pressure Pressure forces solute particles
into the spaces between the solvent particles
More pressure = Dissolve Fastergas
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Warm-Up
1.Find the density of a bowling ball with a mass of 6,000 g and a volume of 300 ml.
2. Find the mass of an object with a density of 20 g/ml and a volume of 100 ml.
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Types of Chemical Reactions• Synthesis reactions occur when two
elements combine and form a compound. (Sometimes these are called combination or addition reactions.)
reactant + reactant 1 product• Basically: A + B AB
• Example: 2H2 + O2 2H2O
• Example: C + O2 CO2
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Practice• Predict the products. Write and balance the
following synthesis reaction equations.• Sodium metal reacts with chlorine gas Na + Cl2 • Solid Magnesium reacts with fluorine gas Mg + F2 • Aluminum metal reacts with fluorine gas Al + F2
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• Decomposition reactions occur when a compound breaks up into the elements or in simpler compounds
• 1 Reactant Product + Product • In general: AB A + B• Example: 2 H2O 2H2 + O2
• Example: 2 HgO 2Hg + O2
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Practice
• Predict the products. Then, write and balance the following decomposition reaction equations:
• Solid Lead (IV) oxide decomposes PbO2(
• Aluminum nitride decomposes AlN
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Practice
Identify the type of reaction for each of the following synthesis or decomposition reactions, and write the balanced equation:
N2 + O2 BaCO3 Co + S NH3 + H2CO3 NI3
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• Single Replacement Reactions occur when one element replaces another in a compound.
• element + compound element + compound A + BC AC + B (if A is a metal) ORA + BC BA + C (if A is a nonmetal)
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• Double Replacement Reactions occur when a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compound
• Compound + compound compound + compound
• AB + CD AD + CB
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• Combustion reactions occur when a hydrocarbon reacts with oxygen gas.
• This is also called burning!!! In order to burn something you need the 3 things in the “fire triangle”:1) A Fuel (hydrocarbon)2) Oxygen to burn it with3) Something to ignite the reaction (spark)
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Combustion Reactions• In general:
CxHy + O2 CO2 + H2O• Products in combustion are
ALWAYS carbon dioxide and water. (although incomplete burning does cause some by-products like carbon monoxide)
• Combustion is used to heat homes and run automobiles (octane, as in gasoline, is C8H18)
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Combustion Reactions
Edgar Allen Poe’s drooping eyes and mouth are potential signs of CO poisoning.
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Combustion
• Example• C5H12 + O2 CO2 + H2O
• Write the products and balance the following combustion reaction:• C10H22 + O2
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Practice
Identify the type of reaction for each of the following synthesis or decomposition reactions, and write the balanced equation:
N2 + O2 BaCO3 Co + S NH3 + H2CO3 NI3
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Warm-Up:
State the type of reaction and predict the products:1.BaCl2 + H2SO4 2.C6H12 + O2 3.Zn + CuSO4 4.Cs + Br2 5.FeCO3
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Warm-Up:
In one paragraph, explain why a glass of ice water forms droplets of water on the outside of the glass. Use the following terms:-temperature-molecules-decrease
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Warm-Up: 1. What does CO2 (dry ice) do at room temperature? 2. Name a physical property of charcoal.3. Name a chemical property of charcoal.
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Warm-Up: 1. What is the change of state called when matter goes from a solid directly to a gas?2. What are some ways to make a substance dissolve faster?3. If a solvent cannot dissolve any more of the solute, what is this called?
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Warm-Up: As you sit by the fireplace, your little brother says “we need to add more wood to the fire because these logs have almost disappeared – the fire has destroyed them.”
How would you respond to your brother? Explain.
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1. Find the area of a section of carpet that is 10 m wide and 12 m long. 2. Find the area of a roof that is 15 m wide and 20 m long. 3. Find the area of a county that is shaped like a square with boundaries that are 30 km by 30 km.
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Warm-Up: 1. What is the difference between a physical change and a chemical change?
2. What are some clues that a chemical change/reaction has taken place?
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Warm-Up: 1. List three physical properties of matter.
2. Describe a chemical change.
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2111214163334364344
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Warm-Up: 1. What is volume?
2. What is density?
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Warm-Up: 1. What is volume?2. What is density?3. What is the difference between a physical change and a chemical change?4. What are some clues that a chemical change/reaction has taken place?
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Warm-upUnderstanding Density
• In class today, we are going to make a density column.
• Predict what order these liquids will settle into if they are poured into the same cylinder:
• Water• Alcohol• Dawn dish soap• Vegetable oil• Syrup• Milk (whole)
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Substance Mass (g) Volume (mL) Density g/mL
water
alcohol
Syrup
Vegetable oil
Milk (whole)
Fill out this chart on page 39 of your notebook. You have 4 minutes.
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Pure Substances
Elements CompoundsHomogeneous
MATTER
Heterogeneous
Mixtures
Solute
Solution
Solvent
Examples:
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Pure Substances
Made of one type of matter
ElementsMade of one type of atom
CompoundsMade of 2 or
More atoms bondedtogether
HomogeneousSmooth; consistent
MATTERMade of AtomsHas Mass &
takes up Space
HeterogeneousChunky;
inconsistent
MixturesMade of
more than one type of matter
SoluteThe stuff that is
dissolvedIn the liquid
Ex: Kool-Aid mix
Atom + Atom = Element
Atom + Atom = Molecule
SolutionHomogeneous; All one phaseEx: Kool-Aid
SolventThe liquid that
forms the solutionEx: Water
Examples:Trail Mix
Salad
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CharacteristicsColorShapeSize
TextureMass
VolumeDensity
PhysicalProperties
Describe a Substance
Changes of State
MeltingFreezingBoiling
CondensationIonizationRelaxation
StatesSolidLiquidGas
Plasma
Properties of Matter
ChemicalProperties
Describe how it can form a new substance
Signs of ChangeOdor
Change in TempChange in Color
Bubbles formSolids form
Chemical ReactionsAtoms in two substances
combine to form new substances
ExamplesBurningRustingRotting
Tarnishing
Examples2Na+Cl22NaCl2H2+O22H2O
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Solid_____EnergyAtoms ______stucktogether
Liquid____________EnergyAtoms __________stucktogether
Gas______EnergyAtoms _____stucktogether
Plasma ________EnergyAtoms ____stucktogether
______________________
__________
____
____
____
__________
____
____
____
_________Point
_______Point ______Point
_________Point
States of MatterTe
mpe
ratu
re
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SolidLow EnergyAtoms tightly stucktogether
LiquidMedium EnergyAtoms loosely stucktogether
GasHigh EnergyAtoms not stucktogether
PlasmaHighest EnergyAtoms not stucktogether
FreezingMelting
Relaxation
Cond
ensa
tion
Ionization
Evap
orat
ion
_Melting Point
Boiling Point Dew Point
Freezing Point
States of MatterTe
mpe
ratu
re
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Match the Columns
1. Molecule____2. Element ____3. Compound ____4. Volume ____5. Mixture ____6. Atom ____7. Mass ____8. Matter ____
A. Amount of matter in an objectB. The smallest building block of
matterC. 2 or more atoms combined
togetherD. The amount of space an object
occupiesE. Is made of atomsF. A substance with only 1 type of
atomG. A substance with 2 or more atoms
bound togetherH. A combination of different
substances which retain their individual properties
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Match the Columns_Answers
1. Molecule__C__2. Element __F__3. Compound _G__4. Volume _D___5. Mixture __H__6. Atom __B__7. Mass __A__8. Matter __E__
A. Amount of matter in an objectB. The smallest building block of
matterC. 2 or more atoms combined
togetherD. The amount of space an object
occupiesE. Is made of atomsF. A substance with only 1 type of
atomG. A substance with 2 or more atoms
bound togetherH. A combination of different
substances which retain their individual properties