A scientist to study in a sample of an unknown substance do scientist determine's with the substance is a metalloid with four valence electrons. Which two elements could the unknown be

What coefficients would complete the equation,__K+__Cl2-->__KCL

What is used up in and stops a chemical reaction? A) percent yield? B) limiting reactant C) theoretical yield D) excess reactant

Siberian wood frog Major physical structures and coloring

3. Which of the following would be expected to react with active metals to produce gas bubbles? A. NaOH B. H2SO4 C. КОН D. Naci E. HC F. B&E G. A&C H. D&E

What products are formed from the complete reaction of hydrocarbons orcarbohydrates with oxygen?

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?

Oceans make the temperaturs of nearby land more extreme ... True or false

The Greek letter D stands for A. Mass of B. Rate of C. Change in D. Heat stored in

14. Two or more substances that are together but do not combine to form a new, pure substance.

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution