How many valence electrons does iron have?

A baseball is thrown a distance of 20 meters. What is its speed if it takes 0.5seconds to cover the distance

Equations can be balanced by using the half reaction method. Which step should be completed first when using this method? A. Inserting the coefficients B. Balancing the half reactions. C. Identifying the half reactions. D.

Assign oxidation numbers to each atom in KBrO4

Value of Plank's constant in S. I units Urgently needed

Do elements, compounds, or both store chemical energy?

Which requires the removal of heat, melting or freezing? Is it evaporation? What is it? Why?

Waves are the major force of erosion along coasts

Cup A and cup B are identical. They contain equal volumes of soup at equal temperatures. Both cups are put in a refrigerator. Cup A has a lid, but cup B does not. Which statement best explains why cup A will cool more slowly than cup B? A.

Water is intentionally present in a state where its molecules are far apart during a change of state is molecule slow down which change of state has most likely taking place

What determines the definite energies of electrons?