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Chemical Reactions Basics: Signs & Elements Explained

Explore the signs of chemical reactions, elements, compounds, and their properties. Learn about solutions, solubility, and the Periodic Table in a concise guide for beginners.

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Chemical Reactions Basics: Signs & Elements Explained

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  1. N4 Basics Signs of Chemical Reactions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Calderglen High School

  2. answer 1. What always happens in a chemical reaction? A new substance is always formed Calderglen High School

  3. answer 2. Give examples of signs that a chemical reaction has occured? Energy change Permanent colour change Gas produced (effervescence) Solid formed in a liquid Calderglen High School

  4. answer 3. An element is ……… An element is the simplest type of substance. It is made up of only 1 type of atom. Calderglen High School

  5. answer 4. What is a GROUP in the Periodic Table? A column Calderglen High School

  6. answer 5. What are the Group 1 elements called? Alkali metals Calderglen High School

  7. answer 6. What are the Group 7 elements called? Halogens Calderglen High School

  8. answer 7. What are the Group 0 elements called? Noble gases Calderglen High School

  9. answer 8. What are compounds? Substances made of two or more different types of atom joined together. Calderglen High School

  10. answer 9. What is the difference between a compound and a mixture? The atoms of a compound are joined together. The substances in a mixture are NOT joined and can be easily separated. Calderglen High School

  11. answer What element is present in compounds that have names ending in –ate and –ite? oxygen Calderglen High School

  12. answer 11. What does -ide at the end of the name of a compound indicate? IDE means that the compound is made up of the TWO elements e.g. Sodium chloride has SODIUM and CHORINE Calderglen High School

  13. answer 12. A solute is ………. (a thing that get dissolved) A solute is a substance (usually a solid) which dissolves in a solvent to form a solution. Calderglen High School

  14. answer 13. A solvent is ………… A liquid in which a solute dissolves. Calderglen High School

  15. answer 14. What is a SOLUTION? A solution is formed by dissolving a solute (usually a solid) in a solvent (usually a liquid) Calderglen High School

  16. answer 15. What is an AQUEOUS SOLUTION? When a substance has been dissolved in WATER (think of AQUA = water) Calderglen High School

  17. answer 16. What is meant by a property of a chemical? A property of a chemical is what it is like or what it can do chemically Calderglen High School

  18. answer 17. What is the meaning of the words CONCENTRATED and DILUTE? Concentrated means a large amount of solute in a small volume of solvent. Dilute means a small amount of solute in a large amount of solvent Calderglen High School

  19. answer 18. What is a SATURATED solution? A saturated solution is a solution which cannot dissolve any more solute. Calderglen High School

  20. answer 19. Where in the Periodic Table would you find the METALS and the NON-METALS? Metals are found to the Left Hand Side of the zigzag line; Non-metals to the Right Hand Side of the zig-zag line Calderglen High School

  21. answer 20. What are ATOMS? Atoms are very small, particles which make up every element. They are too small to see. Calderglen High School

  22. answer 21. What is a PRECIPITATE? A precipitate is a solid which is formed when two solutions react together Calderglen High School

  23. answer 22. What is EFFERVESCENCE? Effervescence is bubbling and fizzing when a gas is given off . Calderglen High School

  24. answer 23. Give the SYMBOLS for the elements - lead, gold, sodium, potassium and iron? Lead – Pb Gold – Au Sodium – Na Potassium – K Iron - Fe Calderglen High School

  25. answer 24. What is the difference between COLOURLESS and CLEAR? Colourless means having no colour. Clear means you can see through something. Calderglen High School

  26. answer 25. SOLUBLE means …….. the substance dissolves in the solvent Calderglen High School

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