What are the signs of a chemical reaction?

From what class (es) of elements is the following compound made? nitrogen dioxide metal and metalloid two metals metal and nonmetal two nonmetals

What does oil have to do with fat

German scientists were concerned about Nazi restrictions on uranium sales because a. uranium would not be available for industrial research. b. uranium was important to German missile programs. c. uranium paid for German scientific research. d.

Which physical property can be measured?

Choose the most alkaline substance in the group. A) soda, pH = 2.5 B) household vinegar, pH = 3 C) distilled water, pH = 7.0 ---> D) milk of magnesia, pH = 10.5

One example of a decomposition reaction is the electrolysis of water. the chemical reaction can be expressed by the equation 2 h2o →2 h2 o2. the reactant (s) of this chemical reaction is/are?

When the positive ion of one compound replaces the positive ion of another compound?

A 2.00 L container of gas has a pressure of 1.00 atm at 300 K. The temperature of the gas is halved to 150K, and the measured pressure of the same 2.00 Liter sample is 0.420 atm.

How many moles of ZnCl, will be produced from 23.0 g of Zn, assuming CuCl, is available in excess?

Glaciation in Alaska is a result of interactions between which of the following "spheres"? Check all that apply. A. biosphere B. exosphere C. geosphere D. cryosphere E. atmosphere F. hydrosphere