All flashcards
Flashcard 1: What does the observable property "density" describe when comparing materials?
Answer: Mass per unit volume of a material. Density equals mass divided by volume ( rac{m}{V}).
Flashcard 2: Which option is the best observable property to compare if you need a see-through material: transparency or hardness?
Answer: Transparency. See-through materials must allow light to pass through.
Flashcard 3: Which term describes a material that does not let light pass through?
Answer: Opaque. Light cannot pass through opaque materials at all.
Flashcard 4: Which property describes how hard it is to scratch a material?
Answer: Hardness. Hard materials resist scratching and maintain their surface.
Flashcard 5: Which property describes whether light passes through a material clearly?
Answer: Transparency. Transparent materials allow clear vision through them.
Flashcard 6: Which term describes a material that lets some light through but not clearly?
Answer: Translucent. Light passes through but objects appear blurry or unclear.
Flashcard 7: Which property describes how well a material lets heat move through it?
Answer: Thermal conductivity. Good thermal conductors transfer heat quickly.
Flashcard 8: Which property describes how well a material lets electric current pass through it?
Answer: Electrical conductivity. Conductors have free electrons that carry electric current.
Flashcard 9: Which property best describes a material that does not absorb water easily?
Answer: Water-resistant (low absorbency). Water-resistant materials repel water rather than soaking it up.
Flashcard 10: Which property describes how rough or smooth a material feels?
Answer: Texture. Texture is felt by touch and varies from smooth to rough.
Flashcard 11: Which property describes whether a material floats or sinks in water?
Answer: Density compared to water. Objects denser than water sink; less dense objects float.
Flashcard 12: Which option best compares materials using multiple properties: color only, or color and hardness?
Answer: Color and hardness. Using two properties gives more complete information.
Flashcard 13: Identify the better match for a raincoat: absorbent cotton or water-resistant plastic.
Answer: Water-resistant plastic. Plastic repels water, keeping you dry in rain.
Flashcard 14: Which material is the best electrical conductor: rubber, plastic, or copper?
Answer: Copper. Metals like copper have free electrons for current flow.
Flashcard 15: Which material is the best thermal insulator for a hot drink cup: foam or aluminum?
Answer: Foam. Foam traps air, which is a poor heat conductor.
Flashcard 16: Choose the best material for a window: transparent glass or opaque wood.
Answer: Transparent glass. Windows need transparency to let light through.
Flashcard 17: Identify the material most likely to be attracted to a magnet: iron, wood, or glass.
Answer: Iron. Iron contains magnetic domains that align with magnets.
Flashcard 18: Which conclusion is best if two samples look identical but one conducts electricity and one does not?
Answer: They are different materials with different properties. Appearance alone doesn't reveal all material properties.
Flashcard 19: What is an observable property of a material?
Answer: A characteristic you can detect with senses or simple tests. Observable means you can see, feel, or test it without special equipment.
Flashcard 20: Which property describes how easily a material bends without breaking?
Answer: Flexibility. Flexible materials can bend and return to their original shape.
Flashcard 21: What does the observable property "transparency" describe when comparing materials?
Answer: How much light passes through a material. Materials range from opaque to translucent to transparent.
Flashcard 22: What does the observable property "luster" describe when comparing materials?
Answer: How shiny or reflective a material is. Luster measures surface shine from dull to metallic.
Flashcard 23: What does the observable property "texture" describe when comparing materials?
Answer: How a surface feels (smooth, rough, bumpy). Texture is detected by touch or visual observation.
Flashcard 24: What does the observable property "magnetism" describe when comparing materials?
Answer: Whether a material is attracted to a magnet. Only certain metals like iron show magnetic attraction.
Flashcard 25: What does the observable property "hardness" describe when comparing materials?
Answer: How easily a material can be scratched. Harder materials resist scratching better than softer ones.
Flashcard 26: Which option is the best observable property to compare if you need a scratch-resistant material: hardness or absorbency?
Answer: Hardness. Hard materials resist scratching and surface damage.
Flashcard 27: Identify the best observable property to compare for choosing a pot handle that stays cool: thermal conductivity or luster?
Answer: Thermal conductivity. Poor heat conductors keep handles cool during cooking.
Flashcard 28: Which option is the best observable property to compare for an electrical wire: electrical conductivity or texture?
Answer: Electrical conductivity. Wires need materials that allow electricity to flow.
Flashcard 29: Which option is the best observable property to compare if you need a material that soaks up water: absorbency or luster?
Answer: Absorbency. Absorbent materials have pores that trap water.
Flashcard 30: Identify the material most likely to be magnetic: plastic spoon, iron nail, glass marble.
Answer: Iron nail. Iron contains magnetic domains that align with magnets.