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What is a chemical element?
A substance that cannot be broken down into simpler substances by chemical means.
Define an atom.
The smallest unit of a chemical element, consisting of protons, neutrons, and electrons.
What is a molecule?
A group of two or more atoms bonded together.
What is the periodic table?
An arrangement of chemical elements organized by their atomic number, electron configuration, and recurring chemical properties.
Define ionic bond.
A type of chemical bond that occurs between oppositely charged ions.
What is a covalent bond?
A chemical bond formed when two atoms share one or more pairs of electrons.
Explain what acids and bases are.
Acids are substances that donate protons (H+ ions), while bases are substances that accept protons.
What is pH?
A measure of how acidic or basic a solution is, on a scale of 0 to 14.
Define catalyst.
A substance that increases the rate of a chemical reaction without undergoing permanent changes itself.
What is the law of conservation of mass?
Matter cannot be created or destroyed in a chemical reaction; it can only change forms.
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