Here are some properties of Substance X. • It is a soft grey solid with a dull surface. • When cut with a knife, the cut surface is shiny. The surface does not stay shiny for long because substance X reacts with the oxygen in the air to form an oxide. • It reacts violently with water and gives off the gas hydrogen. • It has a melting point of 63.5°C. • It burns with a violet-coloured flame. a Write down three properties of Substance X, and state whether each property is a physical property or a chemical property.
Question
Here are some properties of Substance X. • It is a soft grey solid with a dull surface. • When cut with a knife, the cut surface is shiny. The surface does not stay shiny for long because substance X reacts with the oxygen in the air to form an oxide. • It reacts violently with water and gives off the gas hydrogen. • It has a melting point of 63.5°C. • It burns with a violet-coloured flame. a Write down three properties of Substance X, and state whether each property is a physical property or a chemical property.
Solution
a) Here are three properties of Substance X:
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Substance X is a soft grey solid with a dull surface. This is a physical property because it describes the substance's appearance without involving a chemical reaction.
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Substance X reacts with the oxygen in the air to form an oxide. This is a chemical property because it involves a chemical reaction where the substance changes into a new substance.
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Substance X reacts violently with water and gives off the gas hydrogen. This is also a chemical property because it describes how the substance reacts with another substance to produce a new substance.
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