1) True or False. Chemical indicators undergo an observable change when a specific chemical is detected. They help to reveal information about substances and their chemical environment. a) True b) False 2) Select three signs of a chemical change (select All correct options) a) Colour change b) Shape change c) Precipitate (solid) formation d) Gas production 3) True or False. We can observe signs that the indicator has undergone chemical change when it's added to our test substance, but the substance being tested does not undergo a chemical change itself. a) True b) False 4) True or False. pH is a chemical property. It is a measure of how acid or basic a substance is, on a scale of 0 to 14 (0 being the strongest acid, 7 neutral, and 14 the strongest base) a) True b) False 5) When Universal Indicator was added to a sample of liquid soap solution, it turned blue and had a pH of 8. These changes indicate that the liquid soap solution is -------- a) acidic b) neutral c) basic 6) A white solid forming in limewater when gas bubbled through indicates the formation of a precipitate. This evidence confirms the presence of ----------- a) oxygen b) carbon dioxide c) hydrogen d) pH 7) Using the universal indicator, what was the pH of lemon juice? a) 7 b) 2 c) 10 d) 4 8) As the pH of lemon juice is 2, this indicates that it is ----------------- a) an acid b) a neutral c) a base 9) Using the universal indicator, what was the pH of soda water? a) 7 b) 2 c) 10 d) 4 10) As the pH of soda water is 4, this indicates that it is ---------- a) an acid b) a neutral c) a base 11) Using the universal indicator, what was the pH of bicarb of soda solution? a) 8 b) 2 c) 10 d) 4 12) As the pH of bicarb of soda solution is 8, this indicates that it is ------------------- a) an acid b) a neutral c) a base 13) Using the universal indicator, what was the pH of liquid soap solution? a) 7 b) 2 c) 10 d) 4 14) As the pH of liquid soap solution is 10, this indicates that it is -------------------- a) an acid b) a neutral c) a base 15) True or False. Chemical indicators undergo an observable change when a specific chemical or condition is detected. They help to reveal information about substances and the chemical environment they are in (such as pH). a) True b) False

9. Investigation: Using Indicators to Detect Substances

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