Is a haircut a physical or chemical change?

How can you use chemical equations to predict the products of the reaction you can carry out?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

How much energy is made when a pice of wood burns. how do you know