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Flashcards by Annabel Howard, updated more than 1 year ago
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| Question | Answer |
| Positives & Negatives of Plastics | Positives: - Can be moulded & coloured into anything - Cheap to produce - Recyclable Negatives: - Pollutes in prodiction - Not heat-resistant - Non-renewable |
| Different types of Variables | Control variables are the things that are kept the same. Independent variable is the thing you are testing. Dependent variable is the thing that you change & the factor you will measure. |
| How to find the Density | Density is found by dividing the mass by volume. D = m/v |
| What is an element? | An element is a pure substance made of only one type of atom. It cannot be broken down into simpler substances |
| What is the function of the nucleus? | The nucleus controls cell activities and stores DNA. |
| What is the function of the cytoplasm? | The cytoplasm is the watery substance containing sugars and salts inside the cell. |
| What is the function of the vacuole? | The vacuole is the fluid filled space inside the cell. |
| What is the function of the cell wall/cell membrane? | The cell wall (plants) gives shape and protects the cell. The cell membrane controls the movement of substances in and out of the cell and protect the cell. |
| What is a mineral? | A mineral is a naturally occurring compound. |
| Define weathering and erosion. | Weathering is the chemical or physical breakdown of rocks. Erosion is the removal of weathered rocks by water, wind and ice. |
| How do organs, tissues, cells and systems intertwine? | Tissues are a group of cells working together to perform a certain task in. Organs are made up of different tissues and organs work together in a system. |
| What do ammeters and voltmeters do? | Ammeters measure the electric current running through a circuit. Voltmeters measure the potential difference between two points in a circuit. |
| Benefits and limitations of scientific models | - Can relay ideas clearly - Allow for predictions to be made - Give insight into something - Not reality - Often not to scale |
| Chemical VS Physical reactions | A chemical reaction is a reaction between two substances that produces a new substance. Often hard to reverse. A physical reaction is a reaction that produces no new substances. |
| What is a molecule? | A molecule is a two or more atoms joined together by chemical bonds. |
| What is a mixture? | A mixture is a combination of different atoms or molecules which can be broken down into its elements. |
| What is a compound? | A compound is a pure substance made up of a combination of different elements in a fixed ratio which can be broken down into its elements by chemical reactions. |
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