Question

chemists look at the world in two ways, often simultaneously. the two worlds of the chemist are the macroscopic world and the microscopic world. macroscopic refers to substances and objects that can be seen, touched, and measured directly. microscopic refers to the particles that make up all matter. chemists must observe matter and do experiments both macroscopically and microscopically and then make generalizations and propose explanations that are meaningful in nature. for example, anyone can observe the physical change in appearance that an iron object such as a tractor that is left out in the elements gradually turns to rust. a chemist looks at the rusting tractor and thinks about what is going on with the individual particles that make up the iron and how they are changing as a result of exposure to oxygen in the air and water from rain. throughout your study of chemistry, you will often switch back and forth between the macroscopic and microscopic worlds.
figure 3
rusting artillery shells.
summary
. chemistry is the study of matter and the changes it undergoes.
. chemistry considers both macroscopic and microscopic information.
review

1. give two examples of chemistry in your everyday life.
2. what is the macroscopic world?
3. what is the microscopic world?

Explanation:

1. Example 1: Baking involves chemical reactions like the reaction between baking soda and an acid (e.g., vinegar in some recipes) to produce carbon - dioxide gas, causing the baked goods to rise.

Example 2: Digestion is a chemical process. Enzymes in the stomach and intestines break down food into smaller molecules through chemical reactions for absorption into the body.

1. The macroscopic world refers to substances and objects that can be seen, touched, and measured directly by the human senses without the aid of microscopes.
2. The microscopic world refers to the particles (such as atoms, molecules, ions) that make up all matter and are not visible to the naked eye, requiring microscopes for observation.

Answer:

1. Baking, digestion.
2. Substances and objects that can be seen, touched, and measured directly.
3. Particles that make up all matter and are not visible to the naked eye.