Which describes what happens when two minerals have different arrangements of their atoms?

A.

They have different hardnesses.

B.

They have different colors.

C.

They have different streaks.

D.

They have different cleavages.

How do electrons move between atoms to create electricity?

At a low temperature dry ice (solid CO2), calcium oxide, and calcium carbonate are introduced into a 50.0-L reaction chamber. The temperature is raised to 900.! C.

A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - -> CaSO4 + 2HF The chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?

After 7.9 grams of sodium are dropped into a bathtub full of water how many grams of hydrogen gas are released

Why did Whittaker propose a five kingdom system

Why is melting an ice cube a reversible physical change?

What volume of 0.500 M zinc nitrate contains 2.94 g of zinc nitrate?

Which statement is true about the elements fluorine, chlorine, and oxygen? A. They are all halogens. B. They react easily with metals. C. They are similar to noble gases. D. They are all nonmetals.

What kind of element has the greatest tendency to attract electrons? why?