Across
- 3. What is the centre of an atom called?
- 5. What is the positive charge in an atom?
- 7. What will happen to the pressure inside of a sealed tube if you raise the temperature?
- 9. True or false? Bases have a pH level below 7.
- 10. Name a force that keeps molecules together.
- 13. K is the chemical symbol for which element?
- 16. What is the first element on the periodic table?
- 18. What is the name of the compound NaCl?
- 19. How many electrons in a Hydrogen (H) atom?
- 21. True or false? Acids have a pH level below 7.
- 23. Famous New Zealand scientist Ernest Rutherford was awarded a Nobel Prize in which field?
- 25. Which is an example of a crystal lattice?
- 27. What is H20 more commonly known as?
- 28. What is the scientific name of water in a gas form?
Down
- 1. How many neutrons in a Hydrogen (H) atom?
- 2. What is the third most common gas found in the air we breathe?
- 4. What is the negative charge in an atom?
- 6. What has no electrical charge in the atom?
- 8. What orbits the nucleus of an atom?
- 10. What do the letters "amu" stand for?
- 11. True or false? A proton carries a positive charge.
- 12. Atoms of the same chemical element that have different atomic mass are known as?
- 14. What is the chemical symbol for gold?
- 15. How many atoms are in a water molecule?
- 17. What is the main gas found in the air we breathe?
- 20. At room temperature, what is the only metal that is in liquid form?
- 22. Can an element be broken down into a simpler substance?
- 24. What is the name given to substances that are initially involved in a chemical reaction?
- 26. Is sodium hydroxide (NaOH) an acid or base?