4. Read and translate

Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds. Chemistry is sometimes called ‘the central science’ because it connects physics with other natural sciences such as geology and biology. Chemistry is a branch of physical science but distinct from physics.

Traditional chemistry starts with the study of elementary particles, atoms, molecules, substances, metals, crystals and other aggregates of matter in solid, liquid, and gas states, whether in isolation or combination. The interactions, reactions and transformations that are studied in chemistry are a result of interaction either between different chemical substances or between matter and energy. Such behaviors are studied in a chemistry laboratory using various forms of laboratory glassware.

http://science.docuwat.ch/videos/atoms/chemistry

There are five major branches of chemistry:

Organic chemistry focuses on the structure, properties, and preparation of chemical compounds that consist primarily of carbon and hydrogen.

Inorganic chemistry deals with the properties and behavior of inorganic compounds.

Analytical chemistry involves the qualitative and quantitative determination of the chemical components of substances.

Physical chemistry studies the effect of chemical structure on the physical properties of a substance.

Biochemistry is the study of chemical reactions that take place in living things.

Thus, although there are five main branches of chemistry, there are many sub-branches such as quantum chemistry, surface chemistry, environmental chemistry, solid-state chemistry, organometallic chemistry, nuclear chemistry, polymer chemistry and many others.

There is a huge overlap between chemistry and biology, medicine, physics, geology, and many other disciplines.

http://socratic.org/questions/what-are-the-branches-of-chemistry-and-their-definition

5. Answer the questions

1. What does chemistry study?

2. What chemical particles do you know?

3. What is the basic chemical particle?

4. What are the main branches of chemistry?

5. What is the practical application of biochemistry?

6. What are the analytical methods of chemistry?

7. What compounds from carbon and hydrogen do you know?

8. What laboratory glassware do you know?

6. Choose the following expressions to fill the gaps in the sentences: organic chemistry; biochemistry; geochemistry; analytical chemistry; physical chemistry; inorganic chemistry; quantum chemistry;

1. _____________ studies chemical systems in terms of laws and concepts of physics.

2. _____________ is a branch of chemistry whose primary focus is the application of quantum mechanics in physical models and experiments of chemical systems.

3. _____________ is the study of chemical processes in living organisms.

4. _____________ is the branch of chemistry concerned with the properties and behavior of inorganic compounds.

5. Carbon based compounds, usually containing C-H bonds, are the subjects of ____________.

6. _____________ is the study of the separation, identification, and quantification of the chemical components of natural and artificial materials.

7. _____________ uses tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans.