1) True or False: Chemical indicators are substances that undergo an observable chemical change when a specific chemical or condition is detected a) True b) False 2) True or False: Iodine solution is used as a chemical indicator to detect the presence of starch. a) True b) False 3) Iodine solution is used as an indicator to detect the presence of starch. It does this by a) creating bubbles b) changing colour c) creating a 'pop' sound 4) Iodine solution is yellow-brown. What colour does it change to to indicate the presence of starch? a) pink b) green c) yellow d) Blue-black 5) True or False: A Universal indicator is used as a chemical indicator to detect whether a substance is an acid or a base (alkaline). a) True b) False 6) True or False: the universal indicator can change a range of colours across the pH scale, from red (strong acid) to green (Neutral) to purple (strong base (alkaline)) a) True b) False 7) If vinegar is added to the mystery powder and fizzing occurs, it suggests that a chemical reaction is taking place, indicating that the powder is most likely a) an acid b) a base (alkaline) 8) What happens when a few drops of iodine solution are added to corn starch?  a) It turned yellow-brown b) it formed a precipitate c) fizzing occurs d) it turns blue-black 9) Vinegar in an acid and baking soda is a base (alkaline). When vinegar is added to baking soda, fizzing indicates that what is produced? a) solid b) gas 10) A Chemical change is a process where substances react, rearranging atoms to form new substances with different properties. a) True b) False

10. Investigation: Identifying mystery powders through chemical test

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