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Questions and Answers
A molecule can only consist of atoms from the same element.
A molecule can only consist of atoms from the same element.
False (B)
Match the following elements with their symbols:
Match the following elements with their symbols:
Oxygen = O Carbon = C Hydrogen = H Nitrogen = N
What type of change occurs when atoms of different elements combine to form a new substance?
What type of change occurs when atoms of different elements combine to form a new substance?
- Thermal change
- Nuclear change
- Chemical change (correct)
- Physical change
The formula for water is H2O.
The formula for water is H2O.
What is a compound?
What is a compound?
What is the key characteristic of a chemical compound?
What is the key characteristic of a chemical compound?
Which symbol represents Iron in the periodic table?
Which symbol represents Iron in the periodic table?
What is the molecular formula for methane?
What is the molecular formula for methane?
How many different chemical elements are listed in the periodic table?
How many different chemical elements are listed in the periodic table?
What is true about the symbols of elements in the periodic table?
What is true about the symbols of elements in the periodic table?
What type of molecular structure does O2 represent?
What type of molecular structure does O2 represent?
What happens during a chemical change?
What happens during a chemical change?
How is the number of atoms indicated in a chemical formula?
How is the number of atoms indicated in a chemical formula?
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Study Notes
Atoms and Elements
- Atoms are fundamental units and building blocks of all matter.
- Over 100 different chemical elements compose matter in the universe.
- The periodic table includes 118 recognized elements.
Element Symbols
- Each element has a unique symbol made up of one to three letters.
- Symbols are derived from the element’s name or its original Latin name.
- Examples of element symbols:
- Carbon: C
- Hydrogen: H
- Oxygen: O
- Iron: Fe (from Latin "ferrum")
Chemical Compounds and Changes
- Atoms can combine to form chemical compounds through chemical changes.
- A chemical change creates a new substance with different properties.
- A molecule consists of two or more bonded atoms.
- Molecules of the same element (e.g., O2) consist of identical atoms.
Compounds
- A compound features different kinds of atoms bonded together.
- Example of a common compound:
- Water (H2O) consists of two hydrogen atoms and one oxygen atom.
- Chemical compounds are formed from identical molecules containing two or more different types of elements.
Examples of Compounds
- Methane (CH4) is composed of carbon and hydrogen.
- The formula CH4 indicates one carbon atom and four hydrogen atoms.
- The absence of a written subscript for one is commonly understood.
Atoms and Elements
- Atoms are fundamental units and building blocks of all matter.
- Over 100 different chemical elements compose matter in the universe.
- The periodic table includes 118 recognized elements.
Element Symbols
- Each element has a unique symbol made up of one to three letters.
- Symbols are derived from the element’s name or its original Latin name.
- Examples of element symbols:
- Carbon: C
- Hydrogen: H
- Oxygen: O
- Iron: Fe (from Latin "ferrum")
Chemical Compounds and Changes
- Atoms can combine to form chemical compounds through chemical changes.
- A chemical change creates a new substance with different properties.
- A molecule consists of two or more bonded atoms.
- Molecules of the same element (e.g., O2) consist of identical atoms.
Compounds
- A compound features different kinds of atoms bonded together.
- Example of a common compound:
- Water (H2O) consists of two hydrogen atoms and one oxygen atom.
- Chemical compounds are formed from identical molecules containing two or more different types of elements.
Examples of Compounds
- Methane (CH4) is composed of carbon and hydrogen.
- The formula CH4 indicates one carbon atom and four hydrogen atoms.
- The absence of a written subscript for one is commonly understood.
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