test 2 review
DESCRIPTION
Test 2 Review. Test Format. Part I: Lab set up Follow directions, answer question, apply information Part II: Written/computer test 31 questions Multiple choice See score right away. Vocabulary. Chemical equation Reactant Product Conservation of mass Closed system Open system - PowerPoint PPT PresentationTRANSCRIPT
Test 2 Review
Test Format
• Part I:– Lab set up– Follow directions, answer question, apply
information• Part II:– Written/computer test– 31 questions– Multiple choice– See score right away
Vocabulary• Chemical equation• Reactant• Product• Conservation of mass• Closed system • Open system• Photosynthesis• Respiration• Fire • Rust• Catalyst• Endothermic
• Exothermic• Precipitate• Chemical change• Physical change• Chemical property• Physical property• Evaporation• Freezing• Boiling• Flammability• Dependent variable• Independent variable
Chemical Equations
Can you identify:• Reactant + reactant product + product• product + product reactant + reactant
Practice
6 CO2 + 6 H20 C6H12O6 + 6 O2
carbon dioxide + water sugar + oxygenCircle the reactants:Box the products:
What is this equation?
Practice
Fe + O2 + H2O Rust
2Mg + O2 2MgO
Law of Conservation of Mass
• Total mass of reactants = Total mass of products
5g H20 + 5g O2 = _____ g 2H2O2
10g = 10g
Law of Conservation of Mass
• Same # of atoms on reactant side as the product side
2H2 + O2 2(H2O)
H= ____ H=____O= ____ O=____
42 2
4
Practice
Mg + O2 MgO
Mg = ____ Mg= ____O = _____ O = _____
Oxygen
MgMg
Oxygen
Oxygen
Is this balanced?
2 Mg + O2 ___ MgO
Mg = ____ Mg= ____O = _____ O = _____
NO
22
22
2
+
Produced a gas
(closed system)
(open system)
5g 85g ___ g
90 g
<90 g
Photosynthesis
6 CO2 + 6 H20 C6H12O6 + 6 O2
carbon dioxide + water sugar + oxygen
RespirationC6H12O6 + 6 O2 6 CO2 + 6 H20 + ATP
sugar + oxygen carbon + water + energydioxide
What influences the rate of a reaction (how fast it happens?)
• Crushing (size)• Stirring (motion)• Temperature• Amount of solution• Catalyst (substance that speeds up reaction)
Describing reactions
• Exothermic = ____________
• Endothermic = _________________
Heat given off
Heat taken in
How has understanding chemistry helped us?
• Inventions of new things• Discovery of new elements• Cooking• Forming new items
Property or Change?
• Property = describes, characteristicWhat it has the ABILITY to do
Change = actually changing
Property or Change?
• Boiling point of a chemical• 2 different liquids mix bubbles• Food coloring in water• Burning an egg• It has a yellow color• It produced a smell• It melted
Property
Property
Change
Change
Change
Change
Change
Physical or Chemical
• Physical = it looks different BUT the atoms are still the same
you could reverse it
• Chemical = may or may not look different BUT the atoms are rearranged differently
you CAN’T reverse it
PC or CC
• Tearing paper• Burning paper• Breaking wood• Campfire• Mixing kool aid• Cooking a cake• Freezing water
Physical change
Physical change
Physical change
Chemical change
Chemical change
Chemical change
Physical change
PPVolumeDensity
Freezes at 30 CBoiling point
Can melt at room temperatureFlexible
MagneticBouncyFloats
Solid, liquid, gas state of matter
CPFlammable/non flammable
Can rustCan tarnish
Can burnCan react with water
PCBreaking a stick
Dissolving kool aidFood coloring in a liquid
Cutting hairBending metal
Scrapping a crayonMelting chocolateEvaporated water
CCGas producedLight given off
Odor producedDiet Coke + Mentos = BubblesBaking Soda + Vinegar = colder
PhotosynthesisRespiration
RustingLeaves changing color
Remember
• Login to utips• Enrollment code• Teach parents turn in orange paper WEDS