Chemistry Questions and Answers

Filtration is commonly used to remove suspended impurities, such as dirt, sand, and other particles, from water. In this process, water is passed through a filter medium that traps the solid impurities while allowing the clean water to pass through.

Copper is known for its multiple oxidation states, including +1 and +2, and its compounds are used in pigments and paints to create various colors, such as blues and greens.

In the electrochemical series, also known as the reactivity series, Sodium is placed at the top. The electrochemical series is a list of elements in the order of their standard electrode potentials (or redox potentials). Elements at the top of the series are more reactive and have a greater tendency to lose electrons and form positive ions.

Isotopes of an element have the same number of protons (which defines the element) but may have different numbers of neutrons. Since atoms are electrically neutral, the number of protons must equal the number of electrons in an atom.

In a molecule with three bonding pairs and no lone pairs around the central atom, the electron pairs arrange themselves in a trigonal planar geometry, with bond angles of approximately 120 degrees.