1.19 In the process of attempting to characterize a substance, achemist makes the following observations: The substance isa silvery white, lustrous metal. It melts at 649 °C and boils at1105 °C. Its density at 20 °C is 1.738 g>cm3. The substanceburns in air, producing an intense white light. It reacts withchlorine to give a brittle white solid. The substance can bepounded into thin sheets or drawn into wires. It is a goodconductor of electricity. Which of these characteristics arephysical properties, and which are chemical properties?
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
1.19 In the process of attempting to characterize a substance, a
chemist makes the following observations: The substance is
a silvery white, lustrous metal. It melts at 649 °C and boils at
1105 °C. Its density at 20 °C is 1.738 g>cm3. The substance
burns in air, producing an intense white light. It reacts with
chlorine to give a brittle white solid. The substance can be
pounded into thin sheets or drawn into wires. It is a good
conductor of electricity. Which of these characteristics are
physical properties, and which are chemical properties?
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