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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 the boiling point and melting point of water?
Boiling: 100°C / Melting: 0°C.
What is a "property"?
A characteristic (特征). Examples: Color, size, shape (颜色、大小、形状).
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 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。
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 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 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。)
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 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。
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。
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。
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 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 "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。
