Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as

(1) a compound (3) a mixture

(2) an isotope (4) a solution

Which of these is a major source of organic compounds? petroleum coal natural gas all of these

Which one is commonly found in Texas? A:Fossil Fuels or B:uranium

A 67.2 g sample of a gold and palladium alloy contains 2.49 * 1023 atoms. what is the composition (by mass) of the alloy?

If the total mass of the products of a reaction is less than the mass of the reactants, what must be true? A nuclear reaction has taken place. A chemical reaction has taken place. Nuclear fusion has occurred. Nuclear fission has occurred.

A volume of 38.7 mL of H2O is initially at 28.0 oC. A chilled glass marble weighing 4.00 g with a heat capacity of 3.52 J/oC is placed in the water. If the final temperature of the system is 26.

Which atom has a change in oxidation number of - 3 in the following redox reaction K2Cr2O7 + H2O + S - - > KOH + Cr2O3 + SO2

Why does fluorine have a higher electronegativity than lithium?

What mineral is this? Irregularly shaped, white with nonmetallic luster, the hardness of 2.5, shows cubic cleavage and dissolves easily in water.

The passage of the USA Patriot Act of 2001 and the creation of the Department of Homeland Security reflect the determination of the United States government to (1) search for weapons of mass destruction in South Asia (2) increase the globalization

Is it possible for 2 different elements to have the same atomic number