Structure of Matter

Flashcard
•
Science
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the atomic number of an element?
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.
2.
FLASHCARD QUESTION
Front
What is the chemical formula for methane?
Back
The chemical formula for methane is CH₄.
3.
FLASHCARD QUESTION
Front
What is the importance of the periodic table in chemistry?
Back
The periodic table organizes elements based on their atomic number and properties, helping to predict chemical behavior.
4.
FLASHCARD QUESTION
Front
How many atoms are in a molecule of NaCl?
Back
A molecule of NaCl contains one sodium atom and one chlorine atom.
5.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula indicate?
Back
The subscript indicates the number of atoms of the element in the molecule.
6.
FLASHCARD QUESTION
Front
How many hydrogen atoms are in 2CH₄?
Back
There are 8 hydrogen atoms in 2CH₄ (2 x 4 = 8).
7.
FLASHCARD QUESTION
Front
What is a molecule?
Back
A molecule is a group of two or more atoms bonded together.
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