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Questions and Answers
In a series circuit, what happens to the total resistance as more resistors are added?
In a series circuit, what happens to the total resistance as more resistors are added?
- The total resistance stays the same
- The total resistance decreases
- The total resistance increases (correct)
- The total resistance becomes zero
What happens to the total current in a parallel circuit if one of the branches is broken?
What happens to the total current in a parallel circuit if one of the branches is broken?
- The total current decreases (correct)
- The total current stays the same
- The total current increases
- The total current becomes zero
What happens to the brightness of bulbs connected in a series circuit if one bulb burns out?
What happens to the brightness of bulbs connected in a series circuit if one bulb burns out?
- The brightness of all the bulbs decreases (correct)
- The brightness of all the bulbs increases
- The brightness of all the bulbs stays the same
- The brightness of all the bulbs becomes zero
Which of the following best defines an alkali in chemistry?
Which of the following best defines an alkali in chemistry?
What is the etymological origin of the word 'alkali'?
What is the etymological origin of the word 'alkali'?
What substance is produced when a water-extract of burned plant ashes undergoes a process involving calcium hydroxide?
What substance is produced when a water-extract of burned plant ashes undergoes a process involving calcium hydroxide?
What adjective is commonly used in English as a synonym for basic, especially for bases soluble in water?
What adjective is commonly used in English as a synonym for basic, especially for bases soluble in water?
What is the pH of a solution of a soluble base?
What is the pH of a solution of a soluble base?
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Study Notes
Series Circuits
- In a series circuit, the total resistance increases as more resistors are added.
Parallel Circuits
- If one of the branches in a parallel circuit is broken, the total current remains the same.
Series Circuit Bulbs
- If one bulb burns out in a series circuit, the brightness of the remaining bulbs decreases or goes out.
Alkali Definition
- An alkali in chemistry is a base that dissolves in water.
Etymology of Alkali
- The word 'alkali' originates from the Arabic word 'al-qalīy', meaning 'the ashes'.
Production of Alkali
- When a water-extract of burned plant ashes undergoes a process involving calcium hydroxide, sodium hydroxide (an alkali) is produced.
Synonym for Basic
- The adjective 'alkaline' is commonly used in English as a synonym for basic, especially for bases soluble in water.
pH of Soluble Base
- The pH of a solution of a soluble base is greater than 7.
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