A lesson focusing on the states of matter (solid, liquid, gas) and the behavior of particles at the molecular level. Students will model particle motion and arrangement, as well as the energy changes that drive phase transitions.
Provide a word bank: (Vibrate, Slide, Zoom, Random, Regular, Spaced out). Use a 3-way Venn diagram for Solid, Liquid, and Gas properties.
Extension
Introduce "Plasma" as a 4th state of matter. Ask students to research where plasma is found (stars, lightning) and how its energy compares to gas.
Appearance changes, but the substance stays the same.
Melting ice / Boiling water
Crushing a powder
Dissolving (like blue powder in water)
Changing state (Solid ↔ Liquid ↔ Gas)
Chemical Change
A new substance is formed with new properties.
Rusting / Oxidation
Burning paper / Wood
Bubbles forming from a reaction (gas production)
Temperature change during a reaction
Law of Conservation of Mass
Mass is neither created nor destroyed. Mass of Reactants = Mass of Products. If you start with 10 atoms of Hydrogen, you MUST end with 10 atoms of Hydrogen, even if they are in new molecules!
Domain 5: Thermal & Phase Mastery
SOLID
Low energy. Particles vibrate in place.
→ HEAT ADDED →
GAS
High energy. Particles zoom far apart.
Critical Reminder: When water boils, the molecules move FASTER and move FARTHER APART. This is a physical change because they are still water (\(H_2O\)) molecules!
During this process, was thermal energy added or removed? ____________________
Scientific Reasoning: A student claims that when a puddle freezes into ice, it is a chemical change because the substance has become hard and cold. Evaluate this claim using the CER method. Is this a physical or chemical change?
Claim
Evidence
Reasoning
Substance X + Substance Y → Product Z + Gas
50g
35g
65g
15g
Section 3: Analysis & Modeling
Modeling: A puddle of liquid water evaporates on a sunny afternoon. Create a model below that shows the start state (liquid) and the end state (gas). Be sure to show particle arrangement and relative motion.
Start: Liquid Water
End: Water Vapor (Gas)
During this process, was thermal energy added or removed? ____________________
Scientific Reasoning: A student claims that when water evaporates into the air, the water molecules have lost energy because they are no longer visible. Evaluate this claim using the CER method. Explain what happens to the energy and motion of the particles during evaporation.
Claim
Evidence
Reasoning
(A) Less than 150g because a gas was produced.
(B) Exactly 150g because mass is conserved.
(C) More than 150g because new substances were formed.
(D) 0g because the reactants were destroyed.
Section 3: Analysis & Modeling
Modeling: You add heat to liquid water over a stove to boil eggs. Create a model below to represent the process of the water turning into a gas.
Your model must: show start/end states, depict all particles, and represent changes in thermal energy.
Start: Liquid
End: Gas
Constructed Response: When water boils on a stove, a student says the water molecules "disappear" and are destroyed. Use the CER method to explain why this is a physical change and describe what happens to the particles.
Claim
Evidence
Reasoning
Substance X + Substance Y → Product Z + Gas
50g
35g
65g
15g
Section 4: Analysis & Modeling
Modeling: You add heat to liquid water over a stove to boil eggs. Create a model below to represent the process of the water turning into a gas.
Your model must: show start/end states, depict all particles, and represent changes in thermal energy.
Start: Liquid
End: Gas
Constructed Response: When water boils on a stove, a student says the water molecules "disappear" and are destroyed. Use the CER method to explain why this is a physical change and describe what happens to the particles.
Claim
Evidence
Reasoning
Most of Earth's freshwater is found in which location?
(A) Oceans
(B) Rivers and lakes
(C) Glaciers and polar ice caps
Section 3: Analysis & Modeling
Modeling: You add heat to liquid water to boil it. Create a model below that shows the start (liquid) and end (gas) states. Show all particles and changes in energy.
Start: Liquid
End: Gas
Constructed Response: Use the CER method to explain why boiling water is a physical change and not a chemical change. Describe what happens to the energy and motion of the particles.
Claim
Evidence
Reasoning
(A) Atmosphere → Biosphere: Water condenses on plants.
(B) Hydrosphere → Atmosphere: Water gains energy and evaporates.
(C) Geosphere → Hydrosphere: Groundwater flows into the pond.
Master Task: Heat Flow Prediction
Draw a diagram below showing the direction of thermal energy transfer when a 50°C metal block is placed in a 20°C bowl of water. Explain when the flow stops.
04
Changes & Conservation
Law of Conservation of Mass
"Matter is never created or destroyed." Every atom you start with as a reactant MUST be present in your products!
4. Rosy put a battery in a beaker of water and observed gas bubbles. She tested the bubbles and found hydrogen and oxygen gas. Which statement best describes the reaction?
(A) Mass was lost because gas bubbles escaped.
(B) The chemical bonds between atoms were broken and rearranged.
(C) It was a physical change because water vapor was produced.
Master Task: The Rust Equation
4 Fe + 3 O2 → 2 Fe2O3
Prove the Law of Conservation of Mass for this reaction by counting the atoms on both sides:
Reactants
Iron (Fe): ________
Oxygen (O): ________
Products
Iron (Fe): ________
Oxygen (O): ________
Mission Accomplished!
You are now ready to dominate IA #3. Enjoy your break!
(A) Infiltration increases; runoff decreases.
(B) Infiltration decreases; runoff increases.
9. Which system interaction is responsible for cloud formation?
(A) Hydrosphere → Atmosphere (Condensation)
(B) Biosphere → Geosphere (Erosion)
Master Task: Ocean-Air Transfer
The sun heats the ocean to 26°C. The air above the ocean is 20°C.
1. Draw an arrow showing the heat flow direction.
2. Explain what happens to the energy of the air molecules.
04
Changes & Conservation
Mass Check
"Atoms are like Lego bricks: they can be rearranged, but you never lose them!"
10. Which of the following is an example of a chemical change?
(A) Melting an ice cube
(B) Iron forming rust
11. If 50g of Reactant A reacts with 50g of Reactant B, and a gas is produced that escapes into the room, what will happen to the measured mass of the remaining product in the open beaker?
(A) It will be less than 100g.
(B) It will be exactly 100g.
Master Task: Atom Balancing
2 H2 + O2 → 2 H2O
Prove mass is conserved in the synthesis of water by counting the atoms on each side:
Reactants
Hydrogen (H): _______
Oxygen (O): _______
Products
Hydrogen (H): _______
Oxygen (O): _______
Mission Accomplished!
Review your work and see you back in class!
13. Thermal energy always transfers from:
(A) Colder material to warmer material
(B) Warmer material to colder material
14. What happened to the angle of the hill in Question 3 of the exam?
(A) It increased
(B) It decreased
15. Clouds form when water vapor cools and ________ around particles.
(A) Evaporates
(B) Condenses
Master Task: Heat Flow Scenario
A scientist measures the Air at 35°C and the Ocean at 25°C.
1. Draw the heat flow direction.
2. Use the CER method to explain why the ocean water will gain energy.
04
Changes & Conservation
16. Which of the following describes a chemical change?
(A) Salt dissolving
(B) Iron rusting
17. In a chemical reaction, the total mass of the products must:
(A) Equal the total mass of the reactants.
(B) Be less than the total mass of the reactants.
18. Evidence of a chemical reaction includes all of the following EXCEPT:
(A) Bubbles/Gas
(B) Phase Change
19. If 10g of A reacts with 10g of B to produce 15g of C, how much gas was released?
5g
10g
20g
20. In a sealed container, the mass of the substances inside will:
(A) Change
(B) Stay the Same
Master Task: Conservation Count
A reaction creates 2 molecules of Rust (\(Fe_2O_3\)). How many atoms of Iron (Fe) were used in the reactants?
Show your counting work below.
Quest Complete!
You have mastered the foundations of Grade 7 Science.
(A) Shape or Volume
(B) Mass
(C) Energy
(D) Identity
13. Density = Mass / ?
(A) Area
(B) Volume
(C) Temperature
(D) Length
14. Flammability is a _______.
(A) Physical Prop
(B) Chemical Prop
(C) State of Matter
(D) Phase change
15. Liquid to Gas needs _______.
(A) Energy gain
(B) Energy loss
(C) Atomic gain
(D) Mass loss
16. Particle diagrams of elements _______.
(A) Show 1 atom type
(B) Show bonded mix
(C) Show unbonded mix
(D) Show no atoms
Master Task: Particle Analysis
Draw a particle diagram for a Mixture of Elements and a Mixture of Compounds. Explain how a mixture differs from a pure substance.
03
Earth's Systems
17. Most freshwater is in _______.
(A) Rivers & Lakes
(B) Glaciers & Caps
(C) Oceans
(D) Atmosphere
18. Ocean water is _______.
(A) Saltwater
(B) Distilled water
(C) Freshwater
(D) Pure H2O
19. Release from plants = _______.
(A) Transpiration
(B) Infiltration
(C) Runoff
(D) Precipitation
20. Soaking into ground = _______.
(A) Infiltration
(B) Runoff
(C) Evaporation
(D) Condensation
21. Heat always flows _______.
(A) Warm to Cold
(B) Cold to Warm
(C) Solid to Liquid
(D) Air to Water only
22. Heat stops moving at _______.
(A) Equilibrium
(B) Boiling point
(C) Freezing point
(D) 100°C
23. Steep hill = _______.
(A) More Runoff
(B) More Infilt.
(C) More Precip.
(D) Less Gravity
24. Force driving runoff? _______.
(A) Sun's Energy
(B) Gravity
(C) Wind
(D) Magnetism
Master Task: Interaction CER
Claim: Acid rain forming caves is a chemical change. Provide Evidence from the text and Reasoning using the concept of new substances forming.
04
Changes & Conservation
25. Iron rusting is _______.
(A) Physical
(B) Chemical
(C) State change
(D) Mixture
26. Dissolving sugar is _______.
(A) Physical
(B) Chemical
(C) Combustion
(D) Oxidation
27. Mass in sealed bag? _______.
(A) Stays same
(B) Increases
(C) Decreases
(D) Disappears
28. Measured mass loss? _______.
(A) Gas escaped
(B) Mass destroyed
(C) Atoms vanished
(D) Reaction failed
29. Chemical change = _______.
(A) Bond breakage
(B) Atom destruction
(C) Same layout
(D) Only state change
30. Atom count reactants _______.
(A) Equals products
(B) Is less
(C) Is more
(D) Is zero
31. Reaction Evidence? _______.
(A) Bubbles/Temp
(B) Changing volume
(C) Breaking apart
(D) Melting
32. Precipitate is _______.
(A) Solid from liq
(B) Liquid from gas
(C) Gas from solid
(D) Same state
Master Task: Conservation Count
Count atoms: CH4 + 2 O2 → CO2 + 2 H2O. Prove that no atoms were lost.
Reactants
C: ___ | H: ___ | O: ___
Products
C: ___ | H: ___ | O: ___
Quest Complete!
IA #3 Mastery Secured.
Which statement best describes the process of cave formation mentioned in the text?
(A) It is a physical change where rock is crushed by water pressure.
(B) It is a chemical change where limestone reacts with acidic water.
(C) It is a physical change caused by the rapid evaporation of groundwater.
(D) It is an interaction between the biosphere and the atmosphere.
Which statement is TRUE about the transfer of thermal energy between air and ocean water?
(A) Thermal energy always transfers from the warmer material to the colder material.
(B) Thermal energy is always transferred from water to air.
(C) Thermal energy cannot be transferred between air and water.
(D) Thermal energy always transfers from the smaller mass to the larger mass.
A hillside is flattened, decreasing the angle of the slope. How will this affect the relative amounts of infiltration and runoff during a storm?
(A) Infiltration and runoff will both be less.
(B) Infiltration and runoff will both be greater.
(C) Infiltration will be less and runoff will be greater.
(D) Infiltration will be greater and runoff will be less.
Most of Earth's freshwater is found in which location?
(A) Oceans
(B) Rivers and lakes
(C) Glaciers and polar ice caps
(D) Clouds in the atmosphere
Section 3: Analysis & Modeling
Modeling: You add heat to liquid water to boil it. Create a model below that shows the start (liquid) and end (gas) states. Show all particles and use arrows to represent the change in thermal energy.
Start: Liquid
End: Gas
Constructed Response: Use the CER method to explain why boiling water is a physical change and not a chemical change. Describe what happens to the energy and motion of the particles.
Claim
Evidence
Reasoning
(A) Oceans and salt seas
(B) Rivers and large lakes
(C) Glaciers and polar ice caps
(D) Clouds and water vapor
A mudslide flattens a hillside, decreasing its angle. How will this affect infiltration and runoff?
(A) Infiltration and runoff will both be less.
(B) Infiltration and runoff will both be greater.
(C) Infiltration will be less and runoff will be greater.
(D) Infiltration will be greater and runoff will be less.
Section 3: Changes in Matter
Which process is an example of a physical change?
(A) burning paper
(B) melting an ice cube
(C) rusting metal
(D) rotting fruit
A reaction uses 50g of Reactant X and 70g of Reactant Y. If a solid product and a gas are formed, what must be their combined mass?
(A) 50g
(B) 70g
(C) 120g
(D) 150g
Which observation is the BEST evidence that a chemical change has occurred?
(A) A substance changes from a liquid to a solid.
(B) A solid is crushed into a very fine powder.
(C) Bubbles form when two clear liquids are mixed.
(D) A blue powder dissolves completely in water.
Section 4: Analysis & Modeling
Modeling: You add heat to liquid water over a stove to boil eggs. Create a model below to represent the process of the water turning into a gas. Be sure to show: particle arrangement, relative motion, and energy changes.
Start: Liquid
End: Gas
Constructed Response: When water boils on a stove, a student says the water molecules "disappear" and are destroyed. Use the CER method to explain why this is a physical change and describe what happens to the particles.
Claim
Evidence
Reasoning
(A) Shape or Volume
(B) Mass
(C) Atoms
(D) Energy
13. Density = Mass / ?
(A) Area
(B) Volume
(C) Length
(D) Heat
14. Boiling Point is a _______.
(A) Physical Prop
(B) Chemical Prop
(C) Gas state
(D) Mixture
15. Liquid to Gas needs _______.
(A) Energy gain
(B) Energy loss
(C) Mass gain
(D) Atom loss
16. Characteristic properties _______.
(A) Identify stuff
(B) Change with size
(C) Only in liquids
(D) Are always red
Master Task: Particle Analysis
Draw a particle diagram for a Mixture of Elements and a Mixture of Compounds. Explain how a mixture differs from a pure substance.
03
Earth's Systems
17. Most freshwater is in _______.
(A) Rivers & Lakes
(B) Glaciers & Caps
(C) Oceans
(D) Groundwater
18. Ocean water is _______.
(A) Saltwater
(B) Distilled
(C) Freshwater
(D) Pure Water
19. Release from plants = _______.
(A) Transpiration
(B) Infiltration
(C) Runoff
(D) Clouds
20. Soaking into ground = _______.
(A) Infiltration
(B) Runoff
(C) Precipitation
(D) Wind
21. Heat always flows _______.
(A) Warm to Cold
(B) Cold to Warm
(C) Equal always
(D) Fast to Slow
22. Heat stops moving at _______.
(A) Equilibrium
(B) 100°C
(C) 0°C
(D) Melting point
23. Steep hill = _______.
(A) More Runoff
(B) More Infilt.
(C) Less runoff
(D) No rain
24. Force driving runoff? _______.
(A) Sun's energy
(B) Gravity
(C) Magnetism
(D) Life forms
Master Task: Interaction CER
Claim: Acid rain forming caves is a chemical change. Provide Evidence from the text and Reasoning using the concept of new substances forming.
04
Changes & Conservation
25. Iron rusting is _______.
(A) Physical
(B) Chemical
(C) State change
(D) Dissolving
26. Dissolving sugar is _______.
(A) Physical
(B) Chemical
(C) Bond breakage
(D) Burning
27. Mass in sealed bag? _______.
(A) Stays same
(B) Increases
(C) Decreases
(D) Disappears
28. Mass loss in open beaker? _______.
(A) Gas escaped
(B) Destroyed
(C) Vanished
(D) Stayed same
29. Chemical change rearranging? _______.
(A) Atoms bond/break
(B) Identity lost
(C) Size only
(D) No movement
30. Atom count in reactants _______.
(A) Equals products
(B) Is less
(C) Is more
(D) Is zero
31. Evidence of reaction? _______.
(A) Temp change
(B) Melting
(C) Crushing
(D) Stretching
32. Precipitate is _______.
(A) Solid from liq
(B) Liq from gas
(C) Atoms dying
(D) Color change
Master Task: Conservation Count
Count atoms: CH4 + 2 O2 → CO2 + 2 H2O. Prove that no atoms were lost.
Reactants
C: ___ | H: ___ | O: ___
Products
C: ___ | H: ___ | O: ___
Quest Complete!
IA #3 Mastery Secured.
(C) It is a physical change caused by the rapid evaporation of groundwater.
(D) It is an interaction between the biosphere and the atmosphere.
Which statement is TRUE about the transfer of thermal energy between air and ocean water?
(A) Thermal energy always transfers from the warmer material to the colder material.
(B) Thermal energy is always transferred from water to air.
(C) Thermal energy cannot be transferred between air and water.
(D) Thermal energy always transfers from the smaller mass to the larger mass.
A mudslide flattens a hillside, decreasing its angle. How will this affect infiltration and runoff?
(A) Infiltration and runoff will both be less.
(B) Infiltration and runoff will both be greater.
(C) Infiltration will be less and runoff will be greater.
(D) Infiltration will be greater and runoff will be less.
Most of Earth's freshwater is found in which location?
(A) Oceans
(B) Rivers and lakes
(C) Glaciers and polar ice caps
(D) Clouds in the atmosphere
In a chemical reaction, Substance A (40g) reacts with Substance B (60g). If 15g of gas is produced and escapes, what is the mass of the remaining product?
(A) 100g
(B) 85g
(C) 115g
(D) 40g
Section 3: Analysis & Modeling
Modeling: You add heat to liquid water to boil it. Create a model below that shows the start (liquid) and end (gas) states. Show all particles and use arrows to represent the change in thermal energy.
Start: Liquid
End: Gas
Constructed Response: Use the CER method to explain why boiling water is a physical change and not a chemical change. Describe what happens to the energy and motion of the particles.
Claim
Evidence
Reasoning
(A) Shape or Volume
(B) Mass
(C) Atoms
(D) Energy
13. Density = Mass / ?
(A) Area
(B) Volume
(C) Length
(D) Heat
14. Boiling Point is a _______.
(A) Physical Prop
(B) Chemical Prop
(C) Gas state
(D) Mixture
15. Liquid to Gas needs _______.
(A) Energy gain
(B) Energy loss
(C) Mass gain
(D) Atom loss
16. Characteristic properties _______.
(A) Identify stuff
(B) Change with size
(C) Only in liquids
(D) Are always red
Master Task: Particle Analysis
Draw a particle diagram for a Mixture of Elements and a Mixture of Compounds. Explain how a mixture differs from a pure substance.
03
Earth's Systems
17. Most freshwater is in _______.
(A) Rivers & Lakes
(B) Glaciers & Caps
(C) Oceans
(D) Groundwater
18. Ocean water is _______.
(A) Saltwater
(B) Distilled
(C) Freshwater
(D) Pure Water
19. Release from plants = _______.
(A) Transpiration
(B) Infiltration
(C) Runoff
(D) Clouds
20. Soaking into ground = _______.
(A) Infiltration
(B) Runoff
(C) Precipitation
(D) Wind
21. Heat always flows _______.
(A) Warm to Cold
(B) Cold to Warm
(C) Equal always
(D) Fast to Slow
22. Heat stops moving at _______.
(A) Equilibrium
(B) 100°C
(C) 0°C
(D) Melting point
23. Steep hill = _______.
(A) More Runoff
(B) More Infilt.
(C) Less runoff
(D) No rain
24. Force driving runoff? _______.
(A) Sun's energy
(B) Gravity
(C) Magnetism
(D) Life forms
Master Task: Interaction CER
Claim: Acid rain forming caves is a chemical change. Provide Evidence from the text and Reasoning using the concept of new substances forming.
04
Changes & Conservation
25. Iron rusting is _______.
(A) Physical
(B) Chemical
(C) State change
(D) Dissolving
26. Dissolving sugar is _______.
(A) Physical
(B) Chemical
(C) Bond breakage
(D) Burning
27. Mass in sealed bag? _______.
(A) Stays same
(B) Increases
(C) Decreases
(D) Disappears
28. Measured mass loss? _______.
(A) Gas escaped
(B) Destroyed
(C) Vanished
(D) Stayed same
29. Chemical change rearranging? _______.
(A) Atoms bond/break
(B) Identity lost
(C) Size only
(D) No movement
30. Atom count in reactants _______.
(A) Equals products
(B) Is less
(C) Is more
(D) Is zero
31. Evidence of reaction? _______.
(A) Temp change
(B) Melting
(C) Crushing
(D) Stretching
32. Precipitate is _______.
(A) Solid from liq
(B) Liq from gas
(C) Atoms dying
(D) Color change
Master Task: Conservation Count
Count atoms: CH4 + 2 O2 → CO2 + 2 H2O. Prove that no atoms were lost.
Reactants
C: ___ | H: ___ | O: ___
Products
C: ___ | H: ___ | O: ___
Quest Complete!
IA #3 Mastery Secured.
Which statement best describes the process of cave formation mentioned in the text?
(A) It is a physical change where rock is crushed by water pressure.
(B) It is a chemical change where limestone reacts with acidic water.
(C) It is a physical change caused by the rapid evaporation of groundwater.
(D) It is an interaction between the biosphere and the atmosphere.
Which statement is TRUE about the transfer of thermal energy between air and ocean water?
(A) Thermal energy always transfers from the warmer material to the colder material.
(B) Thermal energy is always transferred from water to air.
(C) Thermal energy cannot be transferred between air and water.
(D) Thermal energy always transfers from the smaller mass to the larger mass.
A hillside is flattened, decreasing the angle of the slope. How will this affect the relative amounts of infiltration and runoff during a storm?
(A) Infiltration and runoff will both be less.
(B) Infiltration and runoff will both be greater.
(C) Infiltration will be less and runoff will be greater.
(D) Infiltration will be greater and runoff will be less.
Most of Earth's freshwater is found in which location?
(A) Oceans
(B) Rivers and lakes
(C) Glaciers and polar ice caps
(D) Clouds in the atmosphere
Section 3: Analysis & Modeling
Modeling: You add heat to liquid water to boil it. Create a model below that shows the start (liquid) and end (gas) states. Show all particles and use arrows to represent the change in thermal energy.
Start: Liquid
End: Gas
Constructed Response: Use the CER method to explain why boiling water is a physical change and not a chemical change. Describe what happens to the energy and motion of the particles.
Claim
Evidence
Reasoning
(C) It is a physical change caused by the rapid evaporation of groundwater.
(D) It is an interaction between the biosphere and the atmosphere.
Which statement is TRUE about the transfer of thermal energy between air and ocean water?
(A) Thermal energy always transfers from the warmer material to the colder material.
(B) Thermal energy is always transferred from water to air.
(C) Thermal energy cannot be transferred between air and water.
(D) Thermal energy always transfers from the smaller mass to the larger mass.
A mudslide flattens a hillside, decreasing its angle. How will this affect infiltration and runoff?
(A) Infiltration and runoff will both be less.
(B) Infiltration and runoff will both be greater.
(C) Infiltration will be less and runoff will be greater.
(D) Infiltration will be greater and runoff will be less.
Most of Earth's freshwater is found in which location?
(A) Oceans
(B) Rivers and lakes
(C) Glaciers and polar ice caps
(D) Clouds in the atmosphere
In a chemical reaction, Substance A (40g) reacts with Substance B (60g). If 15g of gas is produced and escapes, what is the mass of the remaining product?
(A) 100g
(B) 85g
(C) 115g
(D) 40g
Section 3: Analysis & Modeling
Modeling: You add heat to liquid water to boil it. Create a model below that shows the start (liquid) and end (gas) states. Show all particles and use arrows to represent the change in thermal energy.
Start: Liquid
End: Gas
Constructed Response: Use the CER method to explain why boiling water is a physical change and not a chemical change. Describe what happens to the energy and motion of the particles.
Claim
Evidence
Reasoning
(A) Shape or Volume
(B) Mass
(C) Atoms
(D) Energy
13. Density = Mass / ?
(A) Area
(B) Volume
(C) Temperature
(D) Length
14. Boiling Point is a _______.
(A) Physical Prop
(B) Chemical Prop
(C) Gas state
(D) Mixture
15. Liquid to Gas needs _______.
(A) Energy gain
(B) Energy loss
(C) Mass gain
(D) Atom loss
16. Characteristic properties _______.
(A) Identify stuff
(B) Change with size
(C) Only in liquids
(D) Are always red
Master Task: Particle Analysis
Draw a particle diagram for a Mixture of Elements and a Mixture of Compounds. Explain how a mixture differs from a pure substance.
03
Earth's Systems
17. Most freshwater is in _______.
(A) Rivers & Lakes
(B) Glaciers & Caps
(C) Oceans
(D) Groundwater
18. Ocean water is _______.
(A) Saltwater
(B) Distilled
(C) Freshwater
(D) Pure Water
19. Release from plants = _______.
(A) Transpiration
(B) Infiltration
(C) Runoff
(D) Clouds
20. Soaking into ground = _______.
(A) Infiltration
(B) Runoff
(C) Precipitation
(D) Wind
21. Heat always flows _______.
(A) Warm to Cold
(B) Cold to Warm
(C) Equal always
(D) Fast to Slow
22. Heat stops moving at _______.
(A) Equilibrium
(B) 100°C
(C) 0°C
(D) Melting point
23. Steep hill = _______.
(A) More Runoff
(B) More Infilt.
(C) Less runoff
(D) No rain
24. Force driving runoff? _______.
(A) Sun's energy
(B) Gravity
(C) Magnetism
(D) Life forms
Master Task: Interaction CER
Claim: Acid rain forming caves is a chemical change. Provide Evidence from the text and Reasoning using the concept of new substances forming.
04
Changes & Conservation
25. Iron rusting is _______.
(A) Physical
(B) Chemical
(C) State change
(D) Dissolving
26. Dissolving sugar is _______.
(A) Physical
(B) Chemical
(C) Bond breakage
(D) Burning
27. Mass in sealed bag? _______.
(A) Stays same
(B) Increases
(C) Decreases
(D) Disappears
28. Measured mass loss? _______.
(A) Gas escaped
(B) Destroyed
(C) Vanished
(D) Stayed same
29. Chemical change = _______.
(A) Bond breakage
(B) Atom destruction
(C) Same layout
(D) Only state change
30. Atom count reactants _______.
(A) Equals products
(B) Is less
(C) Is more
(D) Is zero
31. Evidence of reaction? _______.
(A) Temp change
(B) Melting
(C) Crushing
(D) Stretching
32. Precipitate is _______.
(A) Solid from liq
(B) Liq from gas
(C) Atoms dying
(D) Color change
Master Task: Conservation Count
Count atoms: CH4 + 2 O2 → CO2 + 2 H2O. Prove that no atoms were lost.
Reactants
C: ___ | H: ___ | O: ___
Products
C: ___ | H: ___ | O: ___
Quest Complete!
IA #3 Mastery Secured.
(A) never
(B) sometimes
(C) always
(D) rarely
Master Task: Thermal Equilibrium
Draw a diagram below showing the direction of thermal energy transfer when a 50°C metal block is placed in a 20°C bowl of water. Explain when the flow stops.
04
Changes & Conservation
10. Iron reacting with oxygen to form rust is an example of a:
(A) Physical change
(B) Chemical change
(C) State change
(D) Phase change
11. In a chemical reaction, the total mass of the reactants MUST ________ the total mass of the products.
(A) be less than
(B) be more than
(C) equal
(D) change to energy
Master Task: Conservation Count
2 H2 + O2 → 2 H2O
Count the atoms in the reactants and products to prove mass is conserved:
Reactants
H: ________ | O: ________
Products
H: ________ | O: ________
Mission Accomplished!
You are ready for IA #3. Enjoy your break!
(A) never
(B) sometimes
(C) always
(D) rarely
Master Task: Thermal Equilibrium
Draw a diagram below showing the direction of thermal energy transfer when a 50°C metal block is placed in a 20°C bowl of water. Explain when the flow stops.
04
Changes & Conservation
10. Iron reacting with oxygen to form rust is an example of a:
(A) Physical change
(B) Chemical change
(C) State change
(D) Phase change
11. In a chemical reaction, the total mass of the reactants MUST ________ the total mass of the products.
(A) be less than
(B) be more than
(C) equal
(D) change to energy
Master Task: Conservation Count
2 H2 + O2 → 2 H2O
Count the atoms in the reactants and products to prove mass is conserved:
Reactants
H: ________ | O: ________
Products
H: ________ | O: ________
Mission Accomplished!
You are ready for IA #3. Enjoy your break!
9. Which process involves water vapor being released from plants into the air?
(A) Infiltration
(B) Transpiration
(C) Runoff
(D) Precipitation
10. Thermal energy transfer ________ moves from warmer material to colder material.
(A) never
(B) sometimes
(C) always
(D) rarely
Master Task: Thermal Equilibrium
Draw a diagram showing the direction of thermal energy transfer when a 50°C metal block is placed in a 20°C bowl of water. Explain when the flow stops.
04
Changes & Conservation
11. Iron reacting with oxygen to form rust is an example of a:
(A) Physical change
(B) Chemical change
(C) State change
(D) Phase change
12. In a chemical reaction, the total mass of the reactants MUST ________ the total mass of the products.
(A) be less than
(B) be more than
(C) equal
(D) change to energy
Master Task: Conservation Count
2 H2 + O2 → 2 H2O
Count the atoms in the reactants and products to prove mass is conserved:
Reactants
H: ________ | O: ________
Products
H: ________ | O: ________
Mission Accomplished!
You are ready for IA #3. Enjoy your break!
Grade 7
Science
Condensation: Vapor becoming liquid clouds.
Precipitation: Rain, sleet, or snow.
Runoff: Water flowing over the surface.
Interacting Systems: Cave Formation
"Acidic rain reacts with limestone Geosphere to form a cave."
Vocabulary Checklist
Erosion
Groundwater
Chemical Reaction
Sediment
Explain the role of Erosion in cave formation below:
The Science Lexicon
Section 4 of 4
C
Domain: Thermal & Conservation
Thermal Energy Logic
Thermal Equilibrium
Conduction
Convection
The Law of Conservation of Mass
Reactants
Definition:
Products
Definition:
Identify the Precipitate in a reaction:
"A solid that forms from a liquid solution during a chemical change."
Lexicon Mastery Complete!
You have the vocabulary to win the Interim Assessment.
IA #3 Prep Target
This lesson targets IA Questions 16 (HCl reaction), 30 (Reaction models), and 35 (Mass in open beakers vs sealed systems).
