2. Solvent
The substance that does the (e.g., water = universal solvent).
3. Solution
A mixture formed when solute completely blends into solvent.
How Temperature Influences Solubility:
Solid Solutes in Liquid: As temperature increases, solubility typically (dissolves faster & holds more).
Gas Solutes in Liquid: As temperature increases, gas solubility (warm soda goes flat faster!).
| Category | Core Definition | Key Examples |
|---|---|---|
| Physical Properties | Can be observed or measured WITHOUT altering the chemical identity of the substance. | Color, density, mass, volume, melting point, boiling point, state of matter, solubility |
| Chemical Properties | Can only be observed when a substance reacts to form NEW substances. | Flammability, reactivity with oxygen (rusting), reactivity with acid, toxicity |
The Deciding Question: Did the substance turn into a fundamentally new chemical identity? If NO, it is physical. If YES, it is chemical.
1. Boiling water turns into steam:
2. An iron nail rusts in rainwater:
3. Dissolving sugar in warm tea:
4. Rubbing alcohol catches fire:
Key Takeaway Synthesis:
In 1-2 complete sentences, explain why density and solubility are considered characteristic properties of matter while mass and volume alone are not:
Beaker 1 (\(20^\circ\text{C}\) Cold) Holds max: 204 g sugar
Beaker 2 (\(50^\circ\text{C}\) Warm) Holds max: 260 g sugar
Beaker 3 (\(90^\circ\text{C}\) Hot) Holds max: 415 g sugar
a. Identify the solute and solvent:
Solute: Solvent:
b. Describe the temperature effect:
Multiple Choice & Justification
1. Which observation is definitive evidence of a chemical property in action?
A) Ethanol boils at 78.4 °C
B) Liquid bleach removes dye via oxidation
C) Table salt dissolves rapidly in warm broth
D) Solid wax melts into a liquid puddle
2. Scenario: Baking soda (\(\text{NaHCO}_3\)) powder is added to clear vinegar (\(\text{CH}_3\text{COOH}\)). Vigorous bubbling occurs, gas escapes, and temperature drops. Is this a physical or chemical change? Justify with two specific signs of change:
Level 3 Challenge
A museum receives an ancient crown claimed to be made of pure gold (\(D_{\text{gold}} = 19.3\text{ g/cm}^3\)). The curator uses a digital balance and water displacement to test its authenticity:
Mass = 965 grams
Initial Water Volume = 300 mL
Final Water Volume = 380 mL
1. Displaced Volume (\(V_2 - V_1\)):
2. Calculated Density (\(D = m / V\)):
3. Detective Conclusion:
Is the crown pure gold or a counterfeit alloy? Defend your conclusion mathematically:
Matter Mastery Review Bundle • Student Practice Sheet Self-Check & Review Complete
a. Volume of statue:
b. Calculated Density:
c. Sink or Float in water?
d. Identity Check: Based on known densities (Aluminum: \(2.7\text{ g/cm}^3\), Iron: \(7.8\text{ g/cm}^3\), Lead: \(11.3\text{ g/cm}^3\)), identify the likely metal:
Question 11 (4 points): Temperature & Solubility Analysis Solutions
A student attempts to dissolve 80 g of Potassium Nitrate (\(\text{KNO}_3\)) in 100 mL of water at two different temperatures. At \(20^\circ\text{C}\), only 32 g dissolves, leaving 48 g of solid settled at the bottom. At \(60^\circ\text{C}\), all 80 g dissolves completely.
a. In the \(20^\circ\text{C}\) beaker, the resulting liquid above the settled powder is considered (circle one): Unsaturated / Saturated / Supersaturated
b. Explain at a molecular level why heating the water allowed the remaining 48 g to dissolve:
Question 12 (4 points): The Saltwater Ocean Swimmer Application
A swimmer floats much higher and with less effort in Utah's Great Salt Lake (density \(\approx 1.16\text{ g/mL}\)) than in a freshwater swimming pool (density \(= 1.00\text{ g/mL}\)). Use density principles to explain this phenomenon:
Challenge Item (Bonus +2 points) Higher-Order Synthesis
A hollow sealed spherical buoy has an outer volume of \(500\text{ cm}^3\) and a mass of \(200\text{ grams}\). When submerged in pure water, how much additional mass (in grams) could be loaded inside the buoy before it completely sinks to the bottom?
Matter Properties Quiz • End of Test Total Points: 25 (+2 Bonus)
The Cargo Ship Paradox Model Response:
While solid aluminum is dense (\(2.7\text{ g/cm}^3\)), a ship is engineered with a wide hollow hull. The total volume includes all the hollow interior air spaces. Because air has negligible mass, the average density of the entire ship (\(\frac{\text{Total Mass}}{\text{Huge Total Volume}}\)) becomes far less than \(1.0\text{ g/mL}\), enabling it to float easily.
Teacher Guide • Answer Key Page 1 Turn for Practice Sheet (p.2) & Quiz Keys →
Matter Mastery Answer Key • Page 2 Practice Part 3-5 & Quiz Core
Part 3: Solubility & Temperature:
• a. Solute & Solvent: Solute = granulated sugar; Solvent = liquid water.
• b. Temperature Effect: Increasing water temperature directly increases the kinetic energy of water molecules, breaking sugar crystal lattices more effectively and greatly increasing the maximum mass of sugar that dissolves (from 204 g at 20°C to 415 g at 90°C).
Part 4: Physical vs. Chemical Showdown:
• Question 1: Correct answer is B (Bleach removing color via chemical oxidation). (A, C, D are physical changes).
• Question 2 (Baking Soda & Vinegar): Chemical change. Evidence: 1) Vigorous gas production (carbon dioxide bubbling); 2) Temperature drop (endothermic chemical reaction absorbs thermal energy); new substances produced (\(\text{CO}_2\), water, sodium acetate).
Part 5: Master Challenge • The Gold Crown Mystery:
1. Displaced Volume: \(V = 380\text{ mL} - 300\text{ mL} = \mathbf{80\text{ mL}} = \mathbf{80\text{ cm}^3}\).
2. Calculated Density: \(D = \frac{965\text{ g}}{80\text{ cm}^3} = \mathbf{12.06\text{ g/cm}^3}\).
3. Detective Conclusion: The crown is a counterfeit alloy! Pure gold has a characteristic density of \(19.3\text{ g/cm}^3\). At only \(12.06\text{ g/cm}^3\), the goldsmith diluted the gold with a cheaper, less dense metal like silver (\(10.5\text{ g/cm}^3\)) or copper (\(8.96\text{ g/cm}^3\)).
Part 1: Multiple Choice (1 pt each):
Q1. Mass vs Volume: B
Q2. 45g / 15cm³ Density: C (3.0 g/cm³; sinks)
Q3. Lemonade Powder: B (Solute)
Q4. Wood Cut in Half: C (Remains unchanged)
Q5. Chemical Property: C (Corrosion in acid)
Part 2: Property Scenarios (1 pt each):
Q6. Wax melts into liquid: P (Physical)
Q7. Cotton wick burns: C (Chemical)
Q8. Salt crystals dissolve: P (Physical)
Q9. Peroxide decomposes: C (Chemical)
Teacher Note: Phase changes and dissolving are physical; formation of gases, ash, or new chemical bonds is chemical.
Teacher Guide • Answer Key Page 2 Turn for Quiz Analytical Solutions & Rubrics →
Matter Mastery Answer Key • Page 3 Quiz Analytical Key & Teacher Insights
Question 10 (4 pts total): The Submerged Artifact 1 pt each item
• a. Volume: \(110\text{ mL} - 50\text{ mL} = \mathbf{60\text{ mL}}\) (or \(60\text{ cm}^3\)).
• b. Density: \(D = \frac{162\text{ g}}{60\text{ cm}^3} = \mathbf{2.7\text{ g/cm}^3}\).
• c. Sink or Float: Sinks (\(2.7\text{ g/cm}^3 > 1.0\text{ g/mL}\)).
• d. Identity Check: Likely metal is Aluminum (\(2.7\text{ g/cm}^3\)).
Question 11 (4 pts total): Solubility & Temperature 2 pts part a, 2 pts part b
• a. Solution State: Saturated (2 pts). Because undissolved solid remains at the bottom in equilibrium, the liquid holds maximum capacity.
• b. Molecular Explanation: (2 pts). Heating increases the average kinetic energy and speed of water molecules. These faster molecules collide more frequently and forcefully with solute crystals, breaking intermolecular ionic bonds and expanding space between solvent molecules to accommodate more dissolved ions.
Question 12 (4 pts total): Great Salt Lake Swimmer 4 pts criteria rubric
Model Response: The human body has an average density of approximately \(0.98\text{ to }1.01\text{ g/cm}^3\). In freshwater (\(1.00\text{ g/mL}\)), human density is almost equal to water, causing swimmers to sink unless actively treading. In the Great Salt Lake (\(1.16\text{ g/mL}\)), high dissolved salt increases water density significantly above human density. Because the buoyant force equals the weight of displaced fluid, the denser saltwater produces much greater upward buoyant force, allowing the swimmer to float effortlessly high.
Bonus Challenge Question Key (+2 pts):
The \(500\text{ cm}^3\) buoy completely submerges when total mass reaches \(500\text{ g}\) (density = \(1.0\text{ g/cm}^3\)). Since the buoy already has a mass of \(200\text{ g}\), it can hold: \(500\text{ g} - 200\text{ g} = \mathbf{300\text{ grams}}\) of additional mass before sinking!
Common Misconception 1: "Heavy things always sink"
Students confuse total mass with density. Emphasize that a tiny metal needle (\(0.5\text{ g}\)) sinks while an enormous aircraft carrier (\(100,000\text{ tons}\)) floats because buoyancy depends on the mass-to-volume ratio, not mass alone.
Common Misconception 2: "Dissolving is a chemical reaction"
Students often think dissolving sugar creates a new substance because crystals "disappear". Remind students that evaporating the water recovers 100% of the solid sugar unchanged—proving it is purely a physical change.
Matter Mastery Review Bundle • Teacher Solutions Complete Instructional & Assessment Resource
Evenly blended homogeneous mixture.
Example: Sweet Tea
Temperature Influence on Dissolving: Thermal Energy
HOTTER LIQUID: Molecules move faster; solid dissolves (faster/slower).
COLDER LIQUID: Molecules move slower; holds (more/less) solute.
Identity Test
Physical Property SAME IDENTITY
Observed without creating any new substance.
Phase change (Melting ice, boiling water)
Dissolving sugar in coffee
Mass, Volume, Color, Density
Chemical Property NEW SUBSTANCE
Observed when a new chemical substance forms.
Burning wood (flammability / ash)
Iron rusting in water & air
Acid reaction producing gas bubbles
Circle the correct property:
1. Iron bicycle turns rusty orange: [ Physical / Chemical ]
2. Solid wax melts into warm liquid: [ Physical / Chemical ]
3. A campfire releases smoke and ash: [ Physical / Chemical ]
4. Shredding paper into confetti: [ Physical / Chemical ]
Key Summary Check:
An object floats in water because its density is (greater / less) than \(1.0\text{ g/mL}\), while dissolving sugar in tea is a (physical / chemical) change because the sugar's chemical identity stays unchanged.
Matter Core Guided Notes • Review Complete Great job mastering Matter!
b. What happens as water is heated? Circle the correct conclusion: (A) Sugar dissolves slower | (B) Sugar dissolves faster and more sugar fits
Evidence Analysis
1. Identify the Chemical Property:
A) Ice melting into liquid (phase change)
B) Bleach removing dye via reaction (new chemical)
2. Baking Soda + Vinegar Reaction Evidence:
Mixing vinegar with white baking soda produces vigorous gas bubbling and the cup feels cold.
This is a [ Physical / Chemical ] change because gas bubbles and a temperature drop prove a brand new substance was formed!
Step-by-Step Guide
Pure gold has a density of 19.3 g/cm³. Follow these 3 visual steps to test the museum crown:
Step 1: Water Displacement
Final level (\(380\text{ mL}\)) − Start level (\(300\text{ mL}\)) =
80 mL (= 80 cm³)
Step 2: Calculate Density (\(\text{Mass} \div \text{Volume}\))
Crown Mass (\(965\text{ g}\)) ÷ Volume (\(80\text{ cm}^3\)) =
12.06 g/cm³
Step 3: Detective Conclusion
The crown has a density of \(12.06\text{ g/cm}^3\), which is [ MUCH LESS / GREATER ] than pure gold (\(19.3\text{ g/cm}^3\)). Therefore, the crown is [ PURE GOLD / A FAKE ALLOY ]!
Matter Detectives Practice Sheet • Lab Complete Investigation Solved ✓
3. Solución
Mezcla homogénea perfectamente combinada.
Ejemplo: Té dulce
Efecto de la Temperatura en la Solubilidad: Energía Térmica
LÍQUIDO MÁS CALIENTE: Masa sólida se disuelve (más rápido/más lento).
LÍQUIDO MÁS FRÍO: Capacidad total de solutos (disminuye/aumenta).
Prueba de Identidad
Propiedad Física MISMA SUSTANCIA
Se observa sin transformar la identidad de la materia.
Cambios de fase (hielo derritiéndose)
Disolver azúcar en agua
Masa, Volumen, Densidad, Color
Propiedad Química NUEVA SUSTANCIA
Se observa al reaccionar para crear nuevas sustancias.
Quemar madera (inflamabilidad / ceniza)
Oxidación del hierro (herrumbre)
Reacción ácida produciendo burbujas
Encierra en un círculo la opción correcta:
1. Una bicicleta de hierro se oxida: [ Física / Química ]
2. Cera de vela sólida se derrite: [ Física / Química ]
3. Una fogata produce humo y ceniza: [ Física / Química ]
4. Cortar papel en trozos pequeños: [ Física / Química ]
Comprobación de Resumen Final:
Un objeto flota en el agua porque su densidad es (mayor / menor) que \(1.0\text{ g/mL}\), mientras que disolver azúcar en té es un cambio (físico / químico) porque la identidad química del azúcar no cambia.
Notas Guiadas de Materia • Repaso Completo ¡Excelente trabajo aprendiendo sobre la Materia!
a. En agua con azúcar: Soluto = [ Azúcar / Agua ] | Solvente = [ Azúcar / Agua ]
b. ¿Qué sucede al calentar el agua? Encierra la conclusión correcta: (A) Se disuelve más lento | (B) Se disuelve más rápido y cabe mayor cantidad de azúcar
Análisis de Evidencia
1. Identifica la Propiedad Química:
A) Hielo derritiéndose en agua líquida (cambio de fase)
B) Cloro decolorando la tela por reacción (nueva sustancia)
2. Bicarbonato de Sodio + Vinagre:
Al mezclar vinagre con bicarbonato blanco, se produce un fuerte burbujeo de gas y el recipiente se enfría.
Este es un cambio [ Físico / Químico ] porque las burbujas de gas y el cambio de temperatura demuestran que se creó una sustancia completamente nueva.
Paso a Paso
El oro puro tiene una densidad de 19.3 g/cm³. Sigue los 3 pasos para probar la corona del museo:
Paso 1: Desplazamiento de Agua
Nivel final (\(380\text{ mL}\)) − Nivel inicial (\(300\text{ mL}\)) =
80 mL (= 80 cm³)
Paso 2: Calcular Densidad (\(\text{Masa} \div \text{Volumen}\))
Masa de la corona (\(965\text{ g}\)) ÷ Volumen (\(80\text{ cm}^3\)) =
12.06 g/cm³
Paso 3: Conclusión Detectivesca
La corona tiene una densidad de \(12.06\text{ g/cm}^3\), que es [ MUCHO MENOR / MAYOR ] que el oro puro (\(19.3\text{ g/cm}^3\)). Por lo tanto, la corona es [ ORO PURO / UNA ALEACIÓN FALSA ].
Detectives de la Materia • Práctica Completa ¡Misterio Resuelto! ✓
