When a substance reacts simultaneously to give two different products, a parallel or competitive reaction is said to take place.

When these substances react with various chemicals of the body, they create strong free radicals not easily processed by the liver, where they accumulate.

By giving someone a vaccine, the substance that makes their immune system react.

Despite its older name, it is unlikely that this substance reacts as an acid in the conventional sense.

The substance is a strong oxidant and reacts with combustible and reducing materials.

The substance reacts with the aluminum foil and produces the heat.

Scientist Nina and her young Experimenters discover how substances change and react.

With every new thermal stress, the organic foreign substances will react by decomposition.

Depending upon what substances are reacting, the reaction rate varies.

Reactivity is a measure of how a substance reacts with other things.