Chemistry College

QUESTION 1 When a colourless substance is heated in a test tube, the crystals become powdery. There are no condensations or other visible changes inside the test tube. After cooling the mass of the contents of the test tube decreases. The most likely explanation of these observation is that, on heating the Which answer is this? A. B. C. D. crystals lose water. crystals react with air. crystals give off a colourless gas. substance remains unchanged but decreases in mass because it is in powder form.which one ia an answer?​

Answers

Answer 1

The most likely explanation for the given observations is that the crystals lose water when heated, resulting in a transition from crystals to a powdery substance and a decrease in mass after cooling. Option A

When certain substances contain water molecules as part of their crystal structure, heating them can cause the water molecules to evaporate, leading to the loss of water. This can result in a change in the physical properties of the substance, such as a transition from crystalline to powdery form.

The absence of condensation or other visible changes inside the test tube suggests that the substance is not reacting with the air or giving off a colorless gas. If such reactions were occurring, there would likely be observable changes or reactions taking place.

The decrease in mass after cooling can be attributed to the loss of water molecules. Water has mass, and when it evaporates, it escapes from the test tube, causing a reduction in the overall mass of the substance.

Option A

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