Chemicals In Farming (pp. 277-278)
Plants need ____________________ in order to form _______________________ and ____________________ acids such as DNA. Some plants, such as ___________ and _____________ obtain nitrogen through soil ___________________. A chemical __________________ can increase the nitrogen absorbed by plants. One commonly used fertilizer is __________________, NH3, which contains lots of nitrogen. In its liquid form, it is injected below the __________________ of the soil. ________________ fertilizers can also be applied in __________________ form, similar to granules. ____________________ nitrate, _____________ (formula), is a common example of a _________________ fertilizer. It is an __________________ compound that is very _______________ in water.
Plants must also absorb ______________________, a key element for managing the ______________ they need to grow and reproduce. Many _______________________ compounds are not very _________________ in water, so they may be treated chemically to make ___________________-containing compounds that are more soluble.
Another key element, one that enables plants to resist ____________________ and _________________ damage, is ___________________. It is absorbed as ________ by the plant _________________. Potassium is made from _______________ and Canada is the world's largest producer of ___________________.
Farmers also use a variety of _____________________ which are chemicals that control ________________, plant __________________, or __________________. A pesticide that controls weeds is called a _____________________ while a pesticide that controls insects is called an _______________________. Some communities want to ban pesticides since they may be toxic to people and pets in large enough doses.
Certain chemicals can be used on crops to make sure they arrive _________________ at the supermarket. Green __________________ are exposed to ___________________ to stimulate the __________________ process. Apples can be kept fresh by placing them in a sealed environment with ___________ where the lack of __________________ slows down their decay.
Chemicals In Your Cabinet (pg. 278)
Chemistry has had a major role to play in the ___________________ cabinet. The active ingredients of medicines are ____________: chemical substances that have an effect on the ______________. The first drugs were actually ________________. If you had an ache, you may have chewed on the bark of a __________________ tree. The compound in the bark that relieved pain was eventually isolated and used to produce _______________________ acid in 1899. This substance is now known as ______________________.
One of the first synthetic drugs was ___________________ which is a molecular compound that is a _________________ at room temperature but easily _______________________. It was first used as an _______________________ in 1846 and had an impact on ___________________ procedures.
Chemicals In Our Food (pg. 280)
Margarine, a substitute for _________________, was first produced by mixing edible ______________, _____________, and _________________. Most foods have ____________________ added to them. These chemicals include synthetic _________________, _______________________ agents, and _______________________. Even cooking food can cause ________________ changes, making the food easier to digest.