Test on Understanding Acid-Base Indicators and pH
Understanding Acid-Base Indicators and pH: A Student's Guide
Test: Acid-base indicators
20 questions
Question 1: Methyl orange indicator turns red when mixed with oven cleaner.
A. Ano
B. Ne
Explanation: Methyl orange turns yellow in alkalis. Oven cleaners often contain alkalis, meaning they are alkaline.
Question 2: The study materials describe a specific method for separating the juice from red cabbage leaves after crushing them to make an indicator.
A. Ano
B. Ne
Explanation: The study materials state that Kelly 'needs to separate the juice from the leaves' and then asks 'How could she do this?', but they do not provide or describe any specific method for separation.
Question 3: Lake Van is so alkaline that its water naturally forms a lather.
A. Ano
B. Ne
Explanation: The study materials state that Lake Van, the largest lake in Turkey, is so alkaline that the water naturally forms a lather and you can wash in it without using soap.
Question 4: Lemon juice is a neutral substance.
A. Ano
B. Ne
Explanation: The study materials state that 'Most acids, like vinegar and fruit juices, turn litmus red,' indicating that fruit juices, such as lemon juice, are acidic. Neutral solutions are described as not changing the colour of indicators, and examples given are pure water, salt, and sugar solutions, not fruit juices.
Question 5: Methyl orange will change colour if pure water is added to it.
A. Ano
B. Ne
Explanation: Pure water is a neutral solution, and neutral solutions do not change the colour of indicators.