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Changes Around Us: Physical and Chemical

Checkpoint: burning, equations and useful changes

Five ideas from the last four lessons. Answer, read the note, and try again.

A lid is put on a burning pan. The flame goes out. Why?

Which of these is a combustible substance?

Which side of the fire triangle does water mainly take away?

In magnesium + oxygen → magnesium oxide, what is magnesium oxide?

Food rots in a compost pit and makes compost. What kind of change is this?

0 of 5 answered

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This track

  1. 0 Start here
  2. 1 Fold it, cut it, crumple it
  3. 2 Ice, water and steam are one substance
  4. 3 Dissolving is not disappearing
  5. 4 Some of these will not go back
  6. 5 Checkpoint: changes that make nothing new
  7. 6 A test for something new
  8. 7 Five signs, and what each one is worth
  9. 8 One candle, two changes at once
  10. 9 Two questions, not one
  11. 10 Slow changes in rocks
  12. 11 Checkpoint: new substances and the two questions
  13. 12 Burning needs air
  14. 13 The fire triangle
  15. 14 A change written in words
  16. 15 Useful and harmful changes
  17. 16 Checkpoint: burning, equations and useful changes
  18. 17 The big picture
  19. 18 Track quiz

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