AQA GCSE CHEMISTRY KEY WORDS VERIFIED ANSWERS

AQA GCSE CHEMISTRY KEY WORDS VERIFIED ANSWERS 1. What type of solution has a pH level that is low due to the presence of hydrogen ions? Answer: Acid. 2. What is the energy required to start a chemical reaction? Answer: Activation energy. 3. What type of solution has a pH level that is high due to the presence of hydroxide ions? Answer: Alkali. 4. Which metals are known for their high reactivity and are found on the left side of the periodic table? Answer: Alkali metals. 5. What type of hydrocarbon contains only single bonds between carbon atoms? Answer: Alkanes. 6. What type of hydrocarbon contains double bonds between carbon atoms? Answer: Alkenes. 7. What is a mixture of atoms that results in distorted layers that cannot slide past each other? Answer: Alloy. 8. Which electrode is positively charged in electrolysis? Answer: Anode. 9. What is the mixture formed when a soluble substance is added to water? Answer: Aqueous solution. 10. What is the smallest unit of matter, composed of protons, neutrons, and electrons? Answer: Atom. 11. What is the number of protons present in an atom? Answer: Atomic number. 12. What is a base that will react with an acid to form a salt as one of the products? Answer: Base. 13. Which materials can be broken down by microorganisms into simpler substances? Answer: Biodegradable materials. 14. What type of fuel is made from animal or plant products? Answer: Biofuel. 15. What is the process of using bacteria to extract elements from low-yield ores? Answer: Bioleaching. 16. What type of vessel is used to extract iron from its ore in large-scale industrial processes? Answer: Blast furnace. 17. What color is bromine water, and what is its use in testing for double bonds? Answer: Orange, used to test for double bonds. 18. What is a long glass tube with markings to measure volumes of a liquid used in chemical reactions? Answer: Burette. 19. What is the amount of carbon released into the atmosphere based on daily activities, including transportation and energy consumption? Answer: Carbon footprint. 20. What is an agent that speeds up a chemical reaction without being consumed or changed in the process? Answer: Catalyst. 21. Which electrode is negatively charged in electrolysis? Answer: Cathode. 22. What process separates small amounts of dissolved substances using absorbent paper or other materials? Answer: Chromatography. 23. How does collision theory explain chemical reactions, and what conditions are necessary for a reaction to occur? Answer: Collision theory explains chemical reactions as the result of reacting particles colliding with sufficient energy; necessary conditions include adequate energy and proper orientation. 24. What is the process of burning a compound in oxygen, releasing heat and light as byproducts? Answer: Combustion. 25. What type of compound consists of two or more elements chemically bonded together? Answer: Compound. 26. How does covalent bonding occur between non-metals, sharing electrons to form a bond? Answer: Covalent bonding occurs when non-metals share electrons to form a bond. 27. What process involves breaking down long hydrocarbon chains into shorter chains, often resulting in more useful products? Answer: Cracking Crude oil ️A mixture of different length hydrocarbon chains made from decomposing dead plants and animals Desalination ️Removal of salt from water Delocalised electron ️Bonding electron that is no longer associated with any one particular atom Dependent variable ️The variable for which the values is measured for each and every change in the independent variable Diamond ️Giant covalent compound where each carbon atom makes four bonds Diffusion ️The automatic mixing of liquids and gases as a result of the random motion of their particles Displacement ️A type of reaction where one element replaces another in a compound Distillation ️Separation of liquid from a mixture by evaporation followed by con