Reactions of Metals with Oxygen and Oxides: A Student Guide
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10 cards
Question: What is combustion in the context of metals and oxygen?
Answer: Combustion is the reaction of a substance with oxygen.
Question: How can substances be identified during combustion in oxygen according to the investigation?
Answer: By the colour of the flame when they burn in oxygen and the brightness of the flame.
Question: List the metals used in the described investigation of combustion with oxygen.
Answer: Lithium, potassium, sodium, magnesium, iron, copper.
Question: Describe the method used to prepare gas jars for testing metal combustion with oxygen.
Answer: Fill 7 gas jars with oxygen, close them with a glass plate, and seal properly using petroleum jelly.
Question: How were the metal samples prepared and introduced into the oxygen jars in the investigation?
Answer: Place a small amount of each metal in a deflagration spoon, heat it over a flame, and insert it into the gas jar filled with oxygen.
Question: What observations were students instructed to make when each metal reacted with oxygen?
Answer: Observe the flame colour, the brightness of the flame, and the colour of the metal oxide produced.
Question: What is the example chemical equation given for lithium reacting with oxygen?
Answer: 4Li + O2 → 2Li2O
Question: How should the acidity of metal oxides produced be tested in this investigation?
Answer: Use bromothymol blue as an indicator: it turns blue in a basic solution and yellow in an acidic solution.
Question: What does bromothymol blue indicate if it turns blue when testing a metal oxide?
Answer: The metal oxide solution is basic.
Question: What does bromothymol blue indicate if it turns yellow when testing a metal oxide?
Answer: The metal oxide solution is acidic.