A chemical reaction means molecules of one kind are changing to molecules of something different. For example, a chemical reaction occurs when we use an acid rust remover. This does not physically remove the rust. Rather it changes the rust to a new substance that is colorless.o use pH paper, moisten the stain slightly with water and press a piece of Phydrion paper to the carpet and check the color of the paper on the pH chart provided. Some of the color may transfer to the fibers. A safer way is to scoop up some of the moisture from the stain and apply this to the pH strip.
This is just the beginning. 1  The embryo is around 13 mm (1/2 inch) in length. 2  The heart is beating with one chamber. 3  A dividing wall is formed in the heart. 4  Arm and leg buds begin to grow. 5  The lower jaw and the vocal cords are beginning to form. 6  The mouth opening is formed. 7  The inner ear is being created. 8  The digestive tract is developing. 9  The ....
Eight weeks into your pregnancy, or six weeks after conception, your baby's lower limb buds take on the shape of paddles. Fingers have begun to form. Small swellings outlining the future shell-shaped parts of your baby's ears develop and the eyes become obvious.