All flashcards
Flashcard 1: Which classification best fits a material that is dull, brittle, and does not conduct electricity well?
Answer: Nonmetal. These properties are opposite to those of metals.
Flashcard 2: Identify the unknown: it is not magnetic, it is insoluble in water, and it is a poor conductor.
Answer: Nonmetal. These properties match typical nonmetallic materials.
Flashcard 3: Identify the unknown: it is hard, shiny, and scratches glass but does not conduct electricity.
Answer: Mineral (nonmetallic, such as quartz). Hard minerals can scratch softer materials like glass.
Flashcard 4: Which property describes whether a material can be hammered into thin sheets?
Answer: Malleability. Metals like gold can be flattened without breaking.
Flashcard 5: Which option best classifies a material that is shiny, malleable, and conducts electricity well?
Answer: Metal. These are characteristic properties of metals.
Flashcard 6: Which option best classifies a material that is dull, brittle, and a poor electrical conductor?
Answer: Nonmetal. These properties are typical of nonmetals.
Flashcard 7: Identify the material type most likely if a sample is magnetic and conducts electricity well.
Answer: Metal (likely iron or steel). Iron and steel are magnetic metals.
Flashcard 8: Which property describes whether a material lets electricity flow through it easily?
Answer: Electrical conductivity. Conductors have free electrons that carry current.
Flashcard 9: Which property describes how much matter is in a given volume of a substance?
Answer: Density. Measured in extg/cm3 or extg/mL.
Flashcard 10: Which property describes whether a material dissolves in water?
Answer: Solubility. Soluble substances dissolve to form solutions.
Flashcard 11: Which term classifies a material that does not allow electric current to pass easily?
Answer: Insulator. Rubber and plastic are common insulators.
Flashcard 12: Which term classifies a material that allows electric current to pass easily?
Answer: Conductor. Metals are typically good conductors.
Flashcard 13: Which classification fits a material that is fibrous, absorbent, and tears rather than bends permanently?
Answer: Paper or cloth (fiber-based material). Natural fibers absorb water and tear easily.
Flashcard 14: Identify the material type most likely if a sample is transparent, brittle, and an insulator.
Answer: Glass (a nonmetal material). Glass is brittle and doesn't conduct electricity.
Flashcard 15: Identify the result if an unknown has density 0.8g/mL and is placed in water 1.0g/mL.
Answer: It floats. Objects less dense than water float.
Flashcard 16: Which classification fits a material that is flexible, waterproof, and an electrical insulator?
Answer: Plastic. Plastics are synthetic polymers with these properties.
Flashcard 17: Identify the result if an unknown has density 2.5g/mL and is placed in water 1.0g/mL.
Answer: It sinks. Objects denser than water sink.
Flashcard 18: Which test best helps distinguish aluminum from plastic when both are the same shape and size?
Answer: Measure mass and calculate density. Aluminum is much denser than plastic.
Flashcard 19: What is the density formula using mass m and volume V?
Answer: D=Vm. Divide mass by volume to find density.
Flashcard 20: What property describes a material’s ability to let electric current pass through it?
Answer: Electrical conductivity. Conductors have free electrons that carry electric charge.
Flashcard 21: What is the term for a measurable characteristic used to describe and identify a material?
Answer: Physical property. Observable traits help identify materials without changing them.
Flashcard 22: Identify the material type: not magnetic, does not conduct electricity, and is flexible.
Answer: Plastic (polymer). Polymers are insulators with flexible molecular chains.
Flashcard 23: What property describes whether light passes through a material (clear, cloudy, or blocked)?
Answer: Transparency. Clear materials let all light through; opaque block it.
Flashcard 24: What property describes how easily a material can be scratched?
Answer: Hardness. Harder materials resist scratching by softer ones.
Flashcard 25: Which classification best fits a material that is magnetic and conducts electricity well?
Answer: Metal. Metals typically show both magnetic and conductive properties.
Flashcard 26: What property describes a material’s ability to bend without breaking?
Answer: Flexibility. Flexible materials can bend and return to original shape.
Flashcard 27: Which classification best fits a material that is dull, brittle, and a poor conductor?
Answer: Nonmetal. Nonmetals lack metallic luster and conductivity.
Flashcard 28: Which option is the best conclusion if an unknown sample sinks in water and is not magnetic?
Answer: Its density is greater than water; it is not iron or steel. Sinking means density > 1 g/cm³; non-magnetic rules out iron/steel.
Flashcard 29: Choose the correct classification: a sample floats in water and is an electrical insulator.
Answer: Likely plastic or wood (low density insulator). Both materials have density < 1 g/cm³ and don't conduct.
Flashcard 30: Identify the unknown: mass =20g and volume =10cm3; does it sink or float?
Answer: Density =2g/cm3; sinks. 1020=2 g/cm³ > 1 g/cm³ (water), so it sinks.