General Chemistry
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Amethyst (silicon dioxide) is commonly used as a substitute for purple sapphire (aluminum oxide). Which of the following can be used to distinguish between amethyst and purple sapphire?
An unknown element was observed to have the following properties:
1. It appears as a silvery liquid.2. It has a density of 13.53 g/cm3 at room temperature.3. It reacts with molecular iodine to produce a red solid.4. It freezes at −38.83 °C and boils at 356.73 °C.5. It forms a yellow solid when combined with dilute nitric acid.
Classify each property as physical or chemical.
Select the physical property from the following:
Identify whether the given is a physical property or chemical property
a. the density of silver is 10.49 g/mL
b. the hardness of silver is 2.5 Mohs scale
c. the reactivity of silver with acid
d. the melting point of silver is 961.8 °C
Octane is a combustible liquid. Determine whether this property is physical or chemical.