High School Chemistry Blog

Molecular mass relative (Mr) calculated from the atomic mass number (Ar) of the elements in the molecule. Ar express the weight of the element relative to 1/12 atomic mass of C-12 isotope. Here is the example of the Mr NaCl calculation.
Since Ar Na=23 and Ar Cl=35,5...

An acid simply defines as a substance in water solutions dissociate yielding hydrogens ions as only a positive ions. Some acids dissociate in one step yield one hydrogen ion called monobasic acid. Here is the example monobasic acid.
Others acid dissociate yield two or more hydrogen ions through two dissociation steps or more called polybasic acid....

Biology is the study of living things. But, life is very difficult to define.For example, we often find difficulty to ensure if the virus is a living thing or a non-living thing. We must know some characteristics of the object to determine it is included...

Energy, in fact, is never lost: a fundamental law of the universe is the conservation of energy, which states that in a system isolated from all other outside factors, the total amount of energy remains the same, though transformations of energy from...