name the following binary acids.
is the name for K2S, potassium sulphide or potassium sulfide?
and is the name for K2Te, potassium telluride?
K2Te is correct.
For K2S it is potassium sulfide in the U.S. It has long been potassium sulphide in the UK but my understanding is that there is a concerted effort to change that in the UK to the "american" spelling. I am from the U. S. so I can't speak for an official opinion in the UK.
To determine the names of binary acids, you need to identify the anions present in the compounds. Binary acids contain hydrogen (H) combined with another element, often a nonmetal. The anion names generally end in -ide.
For the given compounds:
- K2S contains potassium (K) and sulfur (S). To name this compound, we need to consider that sulfur forms an anion, sulfide (S2-). Sulfur belongs to group 6A on the periodic table, so its charge is -2 when it forms an anion. Therefore, the name for K2S is potassium sulfide.
- K2Te contains potassium (K) and tellurium (Te). Similarly, tellurium forms an anion named telluride (Te2-). Tellurium belongs to group 6A on the periodic table as well, so its charge is -2 when it forms an anion. Therefore, the name for K2Te is potassium telluride.