The Atomic weight of an element is equal to the number of what?

Which of the following is a result of the greenhouse effect? The greenhouse effect is causing the sea level to rise. The greenhouse effect is melting the polar ice caps.

Which statement about enzymes is true? a) They are large molecules that decrease the rate of reactions in the body. b) They are large molecules that increase the rate of biologically important reactions. c) They slow the rate of chemical reactions.

What type of bond is involved when a metal from groups 1 or 2 bond with a nonmetal from groups 16 or 17

The elements listed at the far right side of the periodic table are ___. metals nonmetals transition metals metalloids

Can any other metal effectively replace iron?

The earth names for the 30 alien elements in order of atomic number

Worth 30 pts. Liquid vinegar and solid baking soda chemically react to form solid sodium acetate, liquid water, and carbon dioxide gas.

The electron configurations of two unknown elements X and Y are shown. X: 1s22s22p6 Y: 1s22s22p63s23p6 Which statement is most likely correct about the two elements?

Which is the best example of a closed system

Determine the number of atoms in 2.50 mol zn