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Flashcards by 13sthabenthiran, updated more than 1 year ago
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| Question | Answer |
| Acids and Alkalis | pH can be measured by litmus paper, universal indicator or a pH meter. |
| Energy Transfers | Light, Electrical, Gravitational, Sound, Heat, Nuclear, Elastic, Chemical and Kinetic. Sankey diagrams show wasted energy Combustion = FUEL + OXYGEN --> CARBON DIOXIDE + WATER |
| Cells | All cells have nucleus, cytoplasm, cell membrane. Plant cells have cell wall, chloroplast and vacuole. Specialised cells have features to make them better at their job (eg. red blood cells, wide surface area to carry more oxygen) |
| Tissues and Organisms | Organ systems made of organs, organs made of tissues, tissues made of cells. People can transplant organs. |
| Reproduction | Key words: Uterus, Cervix, Ovaries, Prostate, Urethra, Zygote, Embryo, Menstruation, Courtship. Fertilisation (sperm meets egg) can be internal (like humans) or external (like fish). |
| Particles and Reactions | Chemical changes are when molecules change (eg. iron rusting to become iron oxide.) Physical changes do not change molecules, (eg. melting an ice cube) |
| Rocks | The amount and type of minerals in a rock gives it its colour and its properties. Sedimentary - (chalk) compacted sediments Igneous - (granite) solidified lava Metamorphic - (marble) ^^ changed by heat and pressure |
| Weathering | Biological, chemical, freeze-thaw, onion skin (heat, night, expand, contract), plants transformed by heat and pressure for millions of years make coal |
| Forces and Speed | Unbalanced forces cause change in movement, Friction opposes movement. "Drag" is a general term for resistant forces. |
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