Which two elements in the periodic table have the same number of electrons in their outer orbitals?

Explain how a grain of sand that wash up on a beach could end up some day as lava pouring from a volcano?

The reactive properties or chemical behavior of an atom mostly depend on the number of

Explain how geckos climb glass.

Describe how to find the area of a triangle (do not just give the formula)

Sediment deposited where a river flows into an ocean or lake A Karst topography B delta C flood plain D groundwater E water F runoff

Using your knowledge of symbols, determine which compound listed must contain both copper and oxygen. a. glucose, C6H12O6 b. chalcopyrite, CuFeS2 c. malachite, Cu2CO3 (OH) 2 d. calcite, CaCO3

Molecules move most slowly in: solids liquids gases compounds

When limestone (solid) is heated, it decomposes into lime (solid) and carbon dioxide gas. This is an extremely useful industrial process of great antiquity, because powdered lime mixed with water is the basis for mortar and concrete - the lime

Identify each enthalpy change by name and classify each change as exothermic or endothermic. 1. 1 mol NaCl (s) à 1 mol NaCl (l) 2. C4H10 O (l) à C4H10O (g) 3. H2O (g) à H2O (l) 4. 1 mol NaCl (s) + 3.

Calculate the number of atoms in a 1.26*103 g sample of silicon.