Which of the following is not an example of a physical change? a. Ice melts when warmed b. Dry ice sublimes (converts from a solid to a gas) at room temperature c. Liquid nitrogen converts to a gas at room temperature d. Blue copper sulfate crystals dissolve in water to form a blue solution e. When hydrogen and oxygen gas are mixed in the presence of a spark, water is formed
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.
Which of the following is not an example of a physical change?
a. Ice melts when warmed
b. Dry ice sublimes (converts from a solid to a gas) at room temperature
c. Liquid nitrogen converts to a gas at room temperature
d. Blue copper sulfate crystals dissolve in water to form a blue solution
e. When hydrogen and oxygen gas are mixed in the presence of a spark, water is formed
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