Properties and Changes in Matter

Physical Properties

• Heat conductivity is a measure of how well a material can conduct heat.
• Sublimation refers to the process where a solid turns directly into a gas without passing through the liquid phase.
• Length of a metal object is a quantitative measure, reflecting its physical dimensions.
• Acid resistance indicates a material's ability to withstand acidic environments without degrading.
• Brittleness describes a material that breaks or fractures easily under stress.
• The blue color is a visual property that signifies certain materials, particularly in chemical compounds.
• Density is the mass per unit volume of a substance, crucial for identifying materials.
• Water's boiling point is at 100 degrees Celsius, an important physical characteristic for liquid substances.
• The property of scratching glass indicates hardness, showing the material's ability to scratch softer materials.
• Sour taste is a sensory property associated with acidic substances.
• Hardness is a measure of a material's resistance to deformation or scratching.
• Melting point is the temperature at which a solid becomes a liquid.
• Luster (shine) describes the surface appearance of a substance, often indicating its quality.
• Odor is the characteristic smell of a substance, playing a role in identifying different materials.

Chemical Properties and Changes

• Silver tarnishing is a chemical change resulting from oxidation, creating a dark coating on the metal.
• Exploding dynamite is a chemical change involving rapid decomposition and gas release.
• Combustible substances are those that can ignite and burn in the presence of an ignition source.
• Wood burning results in new substances and energy release, classified as a chemical change.
• Milk souring is a process where bacteria convert lactose into lactic acid, indicating a chemical change.
• Rusting occurs when iron reacts with oxygen and moisture, forming iron oxide; it's a common chemical change.
• Exploding fireworks involve a rapid chemical reaction, resulting in colorful displays and sound.
• Reacting with water (H2O) to form gas indicates a chemical property, showing reactivity with moisture.
• Other reactions can lead to the formation of water, demonstrating another aspect of a material's reactivity.
• Flammability is a critical chemical property describing a substance's ability to ignite and combust.

Physical Changes

• Magnetizing steel alters its magnetic properties without changing its composition.
• Shortening involves physical alteration of fats without changing their chemical structure.
• Water freezing represents a transition from liquid to solid phase, a fundamental physical change.
• Baking bread results in physical changes due to the heat and reactions, creating a different texture and structure in the final product.

Test your knowledge on the physical and chemical properties and changes in matter with these flashcards. Each card presents a key concept, allowing you to learn and review essential definitions related to various processes and properties. Perfect for students studying chemistry or related subjects.