2+ A student is provided with an unknown solution, which will contain one of the following cations: Ba (ag), Cu* (ag), Pb²* (ag), or K* (aq). The unknown solution is mixed with aqueous sodium iodide, sodium hydroxide, and sodium sulfate. The student's observations are shown below. Nal (aq) NaOH(aq) Na,so, (aq) Unknown solution no change precipitate no change Which cation does the unknown solution contain? Select the single best answer. Note: Reference the Solubility of ionic compounds in water table for additional information. 2+ O Barium ion, Ba (aq) O Copper(II) ion, Cu" (ag) O Potassium ion, K' (aq) O Lead(II) ion, Pb" (ag)
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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