Which concept guided Mendeleev’s organization of the periodic table? In a chemical reaction, atoms are not created nor destroyed.

All matter is composed of atoms.

Matter can be classified as a pure substance or mixture.

Properties of elements repeat in predictable patterns

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

In a reaction equation, where are the products located? a.) above the arrow b.) to the right of the arrow c.) to the left of the arrow d.) below the arrow

In salt water solution, the salt is the blank