Minerals are grouped into mineral classes primarily on a basis of the number of cleavage directions present chemistry, specifically the cations within the chemical formula chemistry, specifically the anions within the chemical formula hardness; hard, soft, and medium are the three primary classes

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.

How many neutrons does an element have if its atomic number is 50 and its mass number is 166