Grab notebooks/study guides at front of room Bellwork: What are the four states of matter?
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Transcript of Grab notebooks/study guides at front of room Bellwork: What are the four states of matter?
TN Standards
• CLE.3202.Inq.2 – Recognize that science is a progressive endeavor that reevaluates and extends what is already accepted
• CLE.3202.Inq.3 – Use appropriate tools and technology to collect precise and accurate data
• CLE.3202.Inq.6 – Communicate and defend scientific findings
How Does Matter Change States?
Essential Questions:• 1] What makes up matter?• 2] What kind of energy do all particles of
matter have?• 3] What happens when a substance changes
from one state of matter to another?• 4] What happens to mass and energy during
physical and chemical changes?
Demonstration 1
• Have cotton balls with rubbing alcohol added• Student in the front of each row come to the
front and grab enough cotton balls for row• Each student rub the alcohol on their arm ( skin )
• What happens? What kind of sensations do you feel?
• Why is this happening?
What is Happening?Evaporation
• Your body heat gets transferred to the rubbing alcohol and it evaporates
• This gives that part of your skin a “cooling” sensation
Some Changes Absorb Energy
• Energy is added when water ( or any substance ):
• Evaporates• Melts• Sublimates ( dry ice )
Some Changes Release Energy
• Energy is added when water ( or any substance ):
• Condensation• Freezing
Sweating – Cools Your Body
• So which of the five state changes does sweating represent?
• Is energy released or absorbed when the sweating process occurs?
• How does a dog sweat?
Demonstration 2 ( ongoing )
• Will start boiling water in the back of room
• Will take a few notes while water boils
• Once water boils, will add ~butter to it
Changes of State
• The identity of a substance does not change when the state changes but the energy changes
Active Demonstration
• I will guide you through this
• We will have three groups
• Each group will act like either particles in a gas, liquid, or solid ( one at a time )
• Each group will stand up and act out this role
Active Demonstration - Results
• Solids: particles vibrate in place
• Liquids: particles move faster than in solid so they spread out more
• Gas: particles move very fast so they are really far apart
• Can you walk through ice, water, humid air?
Kinetic Theory of Matter
• Matter is made of atoms and molecules
• These act like tiny particles that are ALWAYS in motion
• Particles move faster at higher temperatures
• Bigger particles move slower than smaller ones AT THE SAME TEMPERATURE
Review States of Matter ( Volume & Shape )
• Solids – definite shape and volume?
• Liquids – definite shape and volume?
• Gas – definite shape and volume?
Review States of Matter ( Volume & Shape )
• Solids – definite shape and volume?– BOTH
• Liquids – definite shape and volume?– ONLY VOLUME
• Gas – definite shape and volume?– NEITHER
Temperature
• Particles in all states of matter have kinetic energy
• Temperature is a measure of the average kinetic energy of particles in an object
Conservation of Mass & Energy
• Mass and Energy are both CONSERVED ALWAYS
• Mass/Energy is neither created nor destroyed
• This applies to state-changes also
Demonstration 2 ( Butter )
• Of course you know this, but what happens when the butter is added to the hot water?
• Why does this happen?
• How does energy ( of both the water and the butter ) change during this process?
• What happens to the particles in both the water & butter ( speed up or slow down ) ?
Challenge – In Your Notes
• Fog: which of the 5 state-changes does fog represent?
• When/Where does fog form
• Is energy absorbed or released when fog forms?
• Is energy and mass conserved when fog forms?