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CloseA chemical equation uses symbols and formulas to show what happens during a chemical reaction, including reactants, products, and their states.

CloseReactants are the starting materials that undergo chemical changes to form new substances.

CloseProducts are the new substances that are created as a result of a chemical reaction.

CloseThe arrow (→) separates the reactants (left side) from the products (right side) and indicates the direction of the reaction.

CloseThe plus sign is used to separate multiple reactants or multiple products, meaning “and.”

CloseRusting forms a new substance (iron oxide), unlike melting, boiling, or cutting which are physical changes.

CloseA word equation uses the names of reactants and products instead of chemical formulas.

CloseThis law states that matter cannot be created or destroyed, so the number of each type of atom must be the same on both sides.

CloseBalancing ensures the same quantity of each element appears on both reactant and product sides.

CloseThis option uses words instead of chemical symbols to describe the reaction.

Close(s) is the state symbol for a solid substance in a chemical equation.

Close(l) indicates that the substance is in the liquid state.

Close(g) stands for gas.

Close(aq) stands for aqueous, meaning the substance is dissolved in water.

CloseA skeletal equation uses correct formulas but has not yet been balanced for atom counts.

CloseThe law of conservation of mass requires total mass of reactants to equal total mass of products.

CloseReactants are always written on the left side of the arrow.

CloseProducts are always written on the right side of the arrow.

CloseThe arrow means “yields,” “produces,” or “gives,” showing the direction of the reaction.

CloseBurning coal involves combustion, forming new substances like carbon dioxide and ash.

CloseA chemical equation indicates what reacts and what forms, but not how fast the reaction occurs.

CloseCoefficients are numbers placed before formulas to equalize atom counts on both sides.

CloseH₂ and O₂ are written on the left side of the arrow, so they are the reactants.

CloseMgO is written on the right side of the arrow, so it is the product.

CloseA chemical equation represents a chemical reaction, which produces new substances.

CloseOnly a balanced equation has equal numbers of each atom on both sides, conserving mass.

CloseAtoms are neither created nor destroyed; they are simply rearranged into new molecules.

CloseThe Greek letter delta (Δ) written above the arrow indicates that heat is supplied to the reaction.

CloseOnly coefficients can be changed to balance an equation; subscripts and formulas must remain the same.

CloseThis equation has 4 H atoms and 2 O atoms on both sides.

CloseEquations provide a concise, symbolic way to represent what happens in a chemical reaction.

CloseReactants are the substances present at the beginning of a chemical reaction.

CloseA chemical formula uses element symbols and subscripts to represent a compound.

CloseCarbon dioxide contains one carbon atom and two oxygen atoms.

CloseRusting produces iron oxide, a new chemical substance.

CloseThe law of conservation of mass states that total mass remains constant in a chemical reaction.

CloseState symbols such as (s), (l), (g), and (aq) indicate the physical state of each substance.

CloseWhile a colour change may occur, it is not indicated in a standard chemical equation.

CloseOxygen (O₂) is an element; water, salt, and sugar are compounds.

CloseA balanced equation shows that mass is conserved from reactants to products.

Close(s) indicates the solid state, which is how sodium chloride normally appears.

CloseEquations provide a shorthand way to describe reactions without writing long sentences.

CloseMagnesium reacts with oxygen to form magnesium oxide (MgO).

CloseChemical reactions involve breaking bonds in reactants and forming new bonds in products.

CloseBy convention, reactants are written on the left side of the arrow.

CloseA balanced equation has the same number of each type of atom on both sides.

CloseMelting ice is a physical change (change of state) and does not produce new substances.

CloseA chemical equation shows reactants, products, their states, and relative amounts.

CloseIron and sulphur chemically combine to form the compound iron sulphide (FeS).

CloseBalancing ensures that matter is neither created nor destroyed during the reaction.