Science 7

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Across
  1. 2. A particle diagram represents atoms as these shapes
  2. 3. Mercury is a toxic metal that can cause ... damage
  3. 8. If a substance does not dissolve in water, it is called...
  4. 10. The type of reaction where an acid and an alkali react to form water
  5. 14. Limewater is an alkaline substance that can damage these and skin
  6. 15. Silver chloride does not dissolve in water, so it forms a white ...
  7. 16. Type of substance that is used to treat indigestion
  8. 17. The test for oxygen works because oxygen allows hot wood to start this
  9. 18. The stomach produces a strong ... to help digest food
  10. 22. The instrument used to measure pH accurately
  11. 25. Magnesium oxide is this because it contains different atoms held together
  12. 26. the liquid that dissolves a solute
  13. 29. A substance that changes colour depending on pH is called an ...
  14. 30. The test for hydrogen works because hydrogen is...
  15. 32. type of paper that is used to test acidity of a solution
  16. 33. pH of a neutral solutions
  17. 34. You test for this gas using a glowing splint – it relights
  18. 35. You test for this gas using a lighted splint – it makes a ‘pop’ sound
Down
  1. 1. A reaction in which a precipitate forms is called a ... reaction
  2. 4. Antacid tablets contain ... to neutralise stomach acid
  3. 5. the colour of the flame when magnesium burns in air
  4. 6. When magnesium burns in air, the mixture gets very...
  5. 7. The new substances formed in a chemical reaction
  6. 9. type of substance forms when an acid and an alkali react together, besides water
  7. 11. The type of diagram that shows atoms as circles joined together is called ... diagram
  8. 12. The substances that react together in a chemical reaction
  9. 13. You test for this gas using limewater – it turns milky
  10. 19. Magnesium + oxygen → magnesium ...
  11. 20. A compound can only be separated using chemical ...
  12. 21. If you mix exactly the right amount of acid and alkali, a ... solution is formed
  13. 23. A ... change can show that a chemical reaction has happened
  14. 24. Copper sulfate + sodium silicate → copper silicate + sodium ...
  15. 26. Characteristics of substance that dissolved in water is called ...
  16. 27. Universal Indicator gives a ... of colours from red to purple
  17. 28. If you mix an insoluble substance with water, the mixture becomes...
  18. 31. The colour of universal indicator at neutral pH