Adjectives

Adjectives
Adjectives are one of the English parts of speech, it is described or modified the meaning of nouns and pronouns. For example: huge, red, angry, unique, rare, etc. An adjective usually comes right before a noun like: a red dress, fifteen people.
Adjectives are described as modifying or quantifying a noun or pronoun, but an easier way to look at the definition of adjectives is that an adjective tells us more and gives us extra information about something.
Chemistry
Read the article. What is the meaning of the words in bold?
Find the examples of plural words in the text?
If you look chemistry up in Webster s Dictionary, you ll see:
chemistry is 1. the science that systematically studies the composition, properties, and
activity of organic and inorganic substances and various elementary forms of matter. 2. chemical
properties, reactions, phenomena, etc.: the chemistry of carbon. 3. a. sympathetic understanding;
rapport. b. usual attraction. 4. the constituent elements of something; the chemistry of love.
My definition is the short, "scientific study of matter, its properties, and interactions with other matter and with energy".
An important point to remember is that chemistry is a science, which means its procedures are
systematic and reproducible and its hypotheses are tested using the scientific method.
Chemists, scientists who study chemistry, examine the properties and composition of matter and
the interactions between substances. Chemistry is closely related to physics and to biology. As is
true for other sciences, mathematics is an essential tool for the study of chemistry.
Fundamental concepts of chemistry

Read the text and fill in the gaps with the following expressions in appropriate forms. Use each expression only once. (how to use nouns and adjectives in sentences)
chemical formula, chemical equation, proton, neutron, element, electron, atomic nucleus, molecule, cation, anion, chemical compound, chemical reaction, chemical bonds, ion, molecule, atomic number
An atom is a collection of matter consisting of a positively charged core (the ________________) which contains ____________ and ____________ and which maintains a number of electrons to balance the positive charge in the nucleus. The atom is also the smallest portion into which an ____________ can be divided and still retain its properties, made up of a dense, positively charged nucleus surrounded by a system of ____________. The most basic chemical substances are the chemical elements. They are building blocks of all other substances. An element is a class of atoms which have the same number of protons in the nucleus. This number is known as the ___________ ____________ of the element. For example, all atoms with 6 protons in their nuclei are atoms of the chemical element carbon, and all atoms with 92 protons in their nuclei are atoms of the element uranium. Each chemical element is made up of only one kind of atom. The atoms of one element differ from those of all other elements. Chemists use letters of the alphabet as symbols for the elements. In total, 117 elements have been observed as of 2007, of which 94 occur naturally on Earth. Others have been produced artificially.
An ____________ is an atom or a molecule that has lost or gained one or more electrons. Positively charged ____________ (e.g. sodium cation Na+) and negatively charged ___________ (e.g. chloride Cl?) can form neutral salts (e.g. sodium chloride NaCl). Electrical forces at the atomic level create _____________ __________ that join two or more atoms together, forming ____________. Some molecules consist of atoms of a single element.
Oxygen molecules, for example, are made up of two oxygen atoms. Chemists represent the oxygen molecule as O2. The 2 indicates the number of atoms in the molecule. 17
When atoms of two or more different elements bond together, they form a ___________ _________. Water is a compound made up of two hydrogen atoms and one oxygen atom. The __________ _________ for a water molecule is H2O.
Compounds are formed or broken down by means of ____________ __________. All chemical reactions involve the formation or destruction of chemical bonds. Chemists use ___________ ___________ to express what occurs in chemical reactions. Chemical equations consist of chemical formulas and symbols that show the substances involved in chemical change. For example, the equation
C + O2 ------------------ CO2
expresses the chemical change that occurs when one carbon atom reacts, or bonds, with an oxygen molecule. The reaction produces one molecule of carbon dioxide, which has the formula CO2.
Basic word order in English
English has a strict order in which words can appear in a sentence. For example:
The researchers sent their manuscript to the journal. This order is rarely altered. It is:
1. subject (the researchers)
2. verb (sent)
3. direct object (their manuscript)
4. indirect object (the journal)
The key is to keep the subject, verb, direct object and indirect object as close to each other as possible. For example:
1- last week the researchers sent their manuscript to the journal for the second time.
2- The researchers last week sent for the second time to the journal their manuscript. (incorrect English).
The position of last week and for the second time is wrong, and the indirect object comes before the direct object.
Compare word order in your language with word order in English
Native English-speaking readers are accustomed to finding the various parts of speech (noun, verb, adjective etc.) in the order given in above. If these parts come in a different order, this requires more effort by the native reader to understand the whole meaning.
Even very banal differences in word order can affect readers. White and black, for instance, sounds strange to a mother tongue English person, the correct order is black and white. It would also sound strange to someone who speaks, for instance Chinese, Hungarian, Polish or Tamil, as in this case they use the same order as in English. But it is likely to sound far more normal to a Hindi, Italian or Spanish speaker, where white comes before black.