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Grade 6 Science - End of Semester 1 Review

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  • Is burning paper a reversible or irreversible change? Why? (烧纸是可逆变化还是不可逆变化？为什么？)
    Irreversible. It cannot be turned back into paper. 不可逆。它不能变回纸张。
  • How is an intrusive igneous rock different from an extrusive igneous rock? (侵入岩和喷出岩有什么不同？)
    Intrusive: Cooled slowly underground. Extrusive: Cooled quickly on the surface. 侵入岩：在地下缓慢冷却。喷出岩：在地表快速冷却。
  • What is "loam"? (什么是“壤土”？)
    A balanced mixture of sand, silt, and clay. 沙子、淤泥和粘土的均衡混合物。
  • In which type of rock are almost all fossils found? (几乎所有的化石都是在哪种岩石中发现的？)
    Sedimentary rock. 沉积岩（几乎所有化石都在这里发现）。
  • What is the difference between a solute and a solvent? (溶质和溶剂之间有什么区别？)
    Solute: The solid that dissolves. Solvent: The liquid (like water). 溶质：溶解的固体。溶剂：溶解固体的液体（如水）。
  • What are three signs (evidence) that a chemical reaction is happening? (化学反应发生的三个迹象（证据）是什么？)
    Color change, new smell, or production of gas (bubbles). 颜色变化、产生新气味或产生气体（气泡）。
  • What are crystals? (什么是晶体？)
    Solid materials where particles are in a regular, repeating pattern. 粒子排列成规则重复模式的固体材料。
  • What two things are needed to turn a rock into a metamorphic rock? (将岩石变成变质岩需要哪两样东西？)
    Heat and Pressure (高温和高压)
  • What is the difference between a physical change and a chemical reaction? (物理变化和化学反应之间有什么区别？)
    Physical: Only the appearance changes. Chemical: A new substance is made. 物理变化：仅外观改变。化学反应：产生了新物质。
  • Is glass a good electrical conductor? (玻璃是良好的导电体吗？)
    No, glass is an insulator. 不，玻璃是绝缘体（不导电）。
  • What are the three main types of rock? (岩石有哪三种主要类型？)
    Igneous, Sedimentary, and Metamorphic. 火成岩、沉积岩和变质岩。
  • What is "compost" and how does it help plants? (什么是“堆肥”？它如何帮助植物生长？)
    Decomposed organic waste; it provides nutrients for growth. 分解后的有机废物；它为生长提供营养。
  • What is a pesticide? (什么是杀虫剂？)
    A chemical used to kill pests like insects or weeds. 一种用于杀死害虫（如昆虫或杂草）的化学物质。
  • What is a "property"?
    A characteristic (特征). Examples: Color, size, shape (颜色、大小、形状).
  • What two properties does all matter have? (所有物质都具有哪两个特性？)
    Mass and Volume (质量与体积).
  • What is a thermal conductor? Give an example. (什么是导热体？请举一个例子。)
    A material that lets heat pass through easily, like metal. 一种能让热量轻松通过的材料，如金属。
  • What is the boiling point and melting point of water?
    Boiling: 100°C / Melting: 0°C.
  • What do we call the process where tiny particles settle at the bottom of a liquid? (我们把微小颗粒沉降在液体底部的过程称为什么？)
    Sedimentation (沉淀). When particles sink to the bottom. (当颗粒沉到水底时。)
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