Multiple Choice
Which term best describes a chemical procedure that yields a positive or negative result indicating the presence of a specific ion or gas?
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4. BONUS: Lab Techniques and Procedures
Test for Ions and Gases
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Which observation is made when hydrogen gas is tested in a flame?
A
It burns with a 'pop' sound.
B
It forms a blue precipitate.
C
It produces a green flame.
D
It turns limewater milky.
Verified step by step guidance1
Understand the nature of hydrogen gas (H\_2) as a diatomic molecule that is highly flammable and reacts readily with oxygen when ignited.
Recall that when hydrogen gas is exposed to a flame, it combusts, producing water (H\_2O) as a product.
Recognize that the combustion of hydrogen in air is often accompanied by a characteristic 'pop' sound due to the rapid reaction between hydrogen and oxygen.
Note that the other options (forming a blue precipitate, producing a green flame, turning limewater milky) are not typical observations for hydrogen gas combustion; for example, turning limewater milky is a test for carbon dioxide, not hydrogen.
Conclude that the key observation when hydrogen gas is tested in a flame is the distinctive 'pop' sound caused by its combustion.
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