How is metamorphic rock formed?

Examine the block from the periodic table for the element nitrogen, chemical symbol N. Using your knowledge of the periodic table, which of these statements is correct about nitrogen? A) All Nitrogen atoms have 7 protons.

What's the most important factor in determining an elements place in the periodic table?

In this equation 2mg+o2=2mgo what is the coefficient to the oxygen molecule A, 2 B, 4 C, 1 D, 0

What will happen if you add more solute to a saturated solution?

Chemical changes can affect physical and chemical properties, whereas physical changes can affect___. A. chemical properties B. physical properties C. both chemical, and physical properties D. None of the above

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?