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What is the basic unit of matter?
atom
Which of the following best defines a molecule?
A group of atoms bonded together
An element is a substance that can be broken down into simpler substances by chemical means.
False
What is the difference between a compound and an element?
A compound consists of two or more elements chemically combined.
What is the main difference between a mixture and a compound?
A mixture is a combination of substances that are not chemically bonded, whereas a compound consists of elements that are chemically bonded.
The atomic number of an atom is determined by the number of protons in its nucleus.
True
How do you calculate the mass number of an atom?
The mass number is the sum of protons and neutrons in the nucleus of an atom.
Which of the following describes an isotope?
An atom with a different number of neutrons than protons
Electrons are negatively charged particles found inside the nucleus of an atom.
False (do you see why?)
What is the charge of a proton?
Positive (+)
Which of the following best describes a neutron?
A particle with no charge
How does electron configuration help determine an element's chemical behavior?
Electron configuration determines how atoms interact and bond with other atoms, affecting their chemical properties.
What information does the periodic table provide about elements?
Atomic mass, atomic number, and chemical symbols
A physical change alters the chemical composition of a substance.
False
What is one key indicator of a chemical change?
Formation of a new substance (e.g., production of gas, color change, formation of a precipitate).
According to kinetic particle theory, what happens to particles in a substance as it is heated?
They vibrate faster and spread apart.
