What is an example of making a qualified observation

Galena, the most common mineral of lead is primarily lead (II) sulfide (PbS). The first step in the production of pure lead is to oxidize lead sulfide into lead (II) sulfite (PbSO3).

To categorize the elements, what reactions did Mendeleev observe? reactions of elements with helium and lithium reactions of elements with boron and beryllium reactions of elements with nitrogen and carbon reactions of elements with oxygen and

In sodium chloride the ions are lined up in a __ patterns

What term best describes ammonia

If a disease killed all of the frogs in the above food web, which population would be most directly affected in a negative way? A. mice B. owls C. insects D. hawks

Which of the following is an incorrect way of rearranging the density formula: a. m=v•d b. V=d/m c. V=m/d d. Both a and b are incorrect

Describe how the periodic table differentiates between metals and nonmetals. I need a very informative description/explanation on this.

When the ideal gas law is arranged as shown below, what property of the gas is being solved for (represented by the X) ? x equals PV over nR

Which element could chlorine bond with to form an ionic compound? helium oxygen fluorine sodium

A scientist conducted one trial experiment and got unexpected results. how can the scientist increase confidence in the results