Test 1

Lab Test• 18-20 ?s• Lab format with follow up

questions– Measure– Observations– PP, CP, PC, CC– Inquiry– Substances/mixtures

Written Test• 42 ?s• MC (multiple choice)• One free response• All items from study guide

Matter

• What are the 3 states of matter?• SOLID, LIQUID, GAS• Animation

Elements• Pure substance

Compounds

• Compound = a pure chemical substance of 2 or more different elements that can only be separated into simpler substances by chemical reactions

• Ex: H2O, CO2, Sugar, Salt

Mixtures

• Mixture = when 2 or more substances combine (physically) and both substance keep their individual properties

• Ex: – flour & sugar– Salt water– Salad

Types of Mixtures

Heterogeneous• Can be visibly and easily

separated• Particle size is bigger or can

eventually separate/settle

Homogeneous • Cannot separate by looking

at it• Uniformly distributed• Oftentimes solutions

HE or HO

• Vinegar• Sand• Air• Sugar water• Vinegar + oil• Chex mix

Physical & Chemical Characteristics

PHYSICAL CHEMICALRefers to physically related things

Refers to what it is made up of (how the atoms are rearranged to make a new thing); reacts

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* Unless you do another chemical reaction

Properties

• What is a property?• Describes, talks about it’s ability to…• Can be physical or chemical• Has it CHANGED yet?....• NO• Does it describe it/have ability to change?

Examples of Properties

• Front Desk:PHYSICAL PROPERTIES CHEMICAL PROPERTIES

Changes

• When it actually changes• Physical: changes size, shape, state, color but

its still the same thing– Remember the 4 S’s

• Chemical: changes what it completely is, chemical reactions, atoms are rearranged– Remember OCPGT + N

Examples of changes

• Tearing paper• Burning paper• Breaking wood• Campfire• Mixing kool aid• Cooking a cake

Physical change

Physical change

Physical change

Chemical change

Chemical change

Chemical change

Property vs. Change

• Property = description or could change in the future

• Change = change• 5 evidences of a chemical change• PCOGT – “Pirates can obtain great treasures”– Precipitate (solid forms)– Color change– Odor(smell)– Gas forms– Temperature change– Evidence of a chemical change– http://resources.educ.queensu.ca/science/main/concept/gen/g09/N.%20Sabet/precipitation.jpg

Property or Change?

• Boiling point• 2 different liquids mix bubbles• Food coloring in water• Burning an egg• It has a yellow color• It produced a smell

Property

Property

Property

Change

Change

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

• Which of the following is an example of a chemical property of water?– A. Boils at 100 C– B. Is transparent– C. Has no odor– D. Reacts with calcium

Is it still water (H2O)

Transparent = see through/clear

No smell

Reacts = chemical reaction

• Which of the following is an example of a physical property of hydrogen? It

• A. Is less dense than air• B. Reacts with oxygen• C. Is highly flammable• D. Forms hydrochloric acid

PHYSICAL PROPERTY

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

Inquiry

• IV• DV• Constants• Control