Chemistry 9th Grade
Flashcard
•
Science
•
9th Grade
•
Practice Problem
•
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 mass number of an atom?
Back
The mass number is the total number of protons and neutrons in an atom's nucleus.
3.
FLASHCARD QUESTION
Front
How do you determine the number of neutrons in an atom?
Back
Subtract the atomic number from the mass number: Neutrons = Mass Number - Atomic Number.
4.
FLASHCARD QUESTION
Front
What is a molecule?
Back
A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.
5.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.
6.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
7.
FLASHCARD QUESTION
Front
What is the law of conservation of mass?
Back
The law states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.
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