| Substance made of only one type of atom

| Substances made of lattices or identical molecules with two or more types of atom

| Atoms of the same element with different numbers of neutrons

| A cluster of atoms that make up an element or a compound

| The number of protons in a nucleus

| Mass number / Atomic mass

| The sum of the number of protons and neutrons in an atom

| A list of all the known elements

| HCl (the acid found in your stomach)

| H₂SO₄ (the acid found in lead‑acid car batteries)

| Ethanoic acid / Acetic acid

| CH₃COOH (the acid found in vinegar)

| NaOH (the base found in drain cleaner)

| The process by which chemicals are changed from one type to another

| Chemicals which take part in a chemical reaction, written on the left side of the arrow

| Chemicals produced in a chemical reaction, written on the right side of the arrow

| Simple written description of what is happening in a reaction

| The amount of a chemical per volume of liquid or gas

| Adjective describing a solution with few particles

| A chemical which changes colour to show whether a substance is acidic, neutral, or basic

| A notation using symbols and subscripts to show the atoms and proportions in a substance

| The theory that all matter is made of atoms and describes how atoms are structured

| Electronic configuration

| The arrangement of electrons in electron shells

| Region surrounding the nucleus where electrons may be found (energy levels)

| An atom that has gained or lost electrons to become electrically charged

| Law of conservation of mass

| Atoms are not created or destroyed in a chemical reaction; only rearranged

| A shorthand notation showing what happens during a chemical reaction

| A chemical equation where the number of each type of atom is the same on both sides

| The number of chemical bonds an atom can form

| An ion containing only one element

| An ion consisting of two or more atoms

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Chemistry Test 2026

Question	Answer


\| Element	\| Substance made of only one type of atom
\| Compound	\| Substances made of lattices or identical molecules with two or more types of atom
\| Isotope	\| Atoms of the same element with different numbers of neutrons
\| Molecule	\| A cluster of atoms that make up an element or a compound
\| Atomic number	\| The number of protons in a nucleus
\| Mass number / Atomic mass	\| The sum of the number of protons and neutrons in an atom
\| Periodic Table	\| A list of all the known elements
\| Hydrochloric acid	\| HCl (the acid found in your stomach)
\| Sulfuric acid	\| H₂SO₄ (the acid found in lead‑acid car batteries)
\| Ethanoic acid / Acetic acid	\| CH₃COOH (the acid found in vinegar)
\| Sodium hydroxide	\| NaOH (the base found in drain cleaner)
\| Reaction	\| The process by which chemicals are changed from one type to another
\| Reactants	\| Chemicals which take part in a chemical reaction, written on the left side of the arrow
\| Products	\| Chemicals produced in a chemical reaction, written on the right side of the arrow
\| Word equation	\| Simple written description of what is happening in a reaction
\| Concentration	\| The amount of a chemical per volume of liquid or gas
\| Dilute	\| Adjective describing a solution with few particles
\| Indicator	\| A chemical which changes colour to show whether a substance is acidic, neutral, or basic
\| Chemical formula	\| A notation using symbols and subscripts to show the atoms and proportions in a substance
\| Atomic Theory	\| The theory that all matter is made of atoms and describes how atoms are structured
\| Electronic configuration	\| The arrangement of electrons in electron shells
\| Electron shell	\| Region surrounding the nucleus where electrons may be found (energy levels)
\| Ion	\| An atom that has gained or lost electrons to become electrically charged
\| Law of conservation of mass	\| Atoms are not created or destroyed in a chemical reaction; only rearranged
\| Chemical equation	\| A shorthand notation showing what happens during a chemical reaction
\| Balanced equation	\| A chemical equation where the number of each type of atom is the same on both sides
\| Valency	\| The number of chemical bonds an atom can form
\| Monatomic ion	\| An ion containing only one element
\| Polyatomic ion	\| An ion consisting of two or more atoms

Created by: knmangalath

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