Question 20 Which statement describes a double replacement reaction? Ethanol burns in oxygen to form carbon dioxide and water. A precipitate of silver chloride forms when solutions of sodium chloride and silver nitrate are combined. Nitrogen oxides are broken down into nitrogen gas and oxygen gas in a catalytic converter. Copper metals form on the surface of a zinc strip when the zinc metal is placed in a cop- per (II) sulfate solution.
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.
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