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Sagot :
Answer:
#### Definitions of Scientific Terms
a. **Elements:**
- **Definition:** Elements are pure chemical substances that consist of identical atoms, each with the same number of protons. They cannot be broken down or transformed by a chemical reaction into a different element.
- **Source:** "An element is a chemical substance that is made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element. All atoms of an element have the same number of protons, though they may have different numbers of neutrons and electrons".
b. **Compounds:**
- **Definition:** Compounds are pure chemical substances composed of two or more types of elements held together by covalent or ionic bonds. They can be broken down into smaller units with practical amounts of energy, unlike elements.
- **Source:** "A compound is a pure substance which consists of identical atoms or molecules with two or more different types of atomic core bound together. Compounds, on the other hand, can have their bonds broken with practical amounts of energy, such as the heat from a fire".
c. **Matter:**
- **Definition:** Matter is anything that has mass and occupies space. It is composed of atoms, which are the smallest units of matter that still retain the fundamental chemical properties of an element.
- **Source:** "Matter is made up of atoms. Atoms are indivisible particles that can't be destroyed or created through chemical reactions".
d. **Molecules:**
- **Definition:** Molecules are groups of atoms held together by chemical bonds and possess no net charge. They are the simplest units of a covalent compound and can be represented in various ways.
- **Source:** "A molecule is the simplest unit of a covalent compound. As we will now see, there are a variety of different ways to represent and draw molecules".
e. **Atoms:**
- **Definition:** Atoms are the smallest units of matter that still retain the fundamental chemical properties of an element. They consist of a positively charged nucleus containing protons and neutrons, surrounded by a cloud of negatively charged electrons.
- **Source:** "An atom is any particle of matter at its most basic level which contains at least one proton. Atoms are indivisible particles that can't be destroyed or created through chemical reactions".
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