Air water and the sun form

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?

Select the more electronegative element in each pair. O F O Br O s O o O N O P O K O Ca

A student uses 3.00g of a fertilizer with an npk ratio of 15-15-10, how much mgnh4po4*6h2o (mm = 245.1 g/mol) should the student produced?

Name the source of lactose and name the type of enzyme that is required to digest it

Two examples of common items that use chemical change

The atom of which element is bigger than an atom of calcium? - Be (Beryllium) - Sr (Strontium) - Sc (Scandium) - Mg (Magnesium)

Draw the hydration shells that form around a potassium ion and a chloride ion when potassium chloride (kcl) dissolves in water. label the positive, negative, and partial charges on the atoms.

If each vitamin has 0.8 grams of calcium, how much calcium will 2.6 vitamins have?

How many grams of silver chromate are there in 0.0375 moles?

What are two type of minerals?