The cards Question Give one observable change that can show a chemical reaction is taking place. Tap to flip Answer e.g. a change in colour, bubbling, or a change of temperature. Question What do bubbles appearing in a chemical reaction show? Tap to flip Answer That a gas is being produced. Question What happens to atoms in a chemical reaction? Tap to flip Answer They rearrange themselves to form new substances. Question Are chemical reactions generally reversible or irreversible? Tap to flip Answer Generally irreversible. Question What is an irreversible reaction? Tap to flip Answer A reaction that goes in one direction only, with the reactants converted into the products. Question On which side of a chemical equation are the reactants found? Tap to flip Answer The left-hand side. Question On which side of a chemical equation are the products found? Tap to flip Answer The right-hand side. Question How does the mass of the products of a chemical reaction compare with the mass of the reactants? Tap to flip Answer It is the same. Question What is a word equation? Tap to flip Answer A way of describing a reaction using the chemical names of the reactants and products. Question What does a balanced symbol equation make sure of? Tap to flip Answer That there are equal numbers of atoms of each element on both sides of the equation. Question In a chemical equation, what is a coefficient? Tap to flip Answer The number placed in front of a chemical formula to balance an equation; it multiplies all the atoms in that formula. Question What does the arrow in a chemical equation stand for? Tap to flip Answer The words 'changes into'. Question What does 2MgO mean in a balanced equation? Tap to flip Answer Two units of MgO, i.e. (MgO)(MgO): the 2 multiplies every atom in the formula. Question What is oxidation? Tap to flip Answer A type of reaction in which oxygen bonds to elements of the reactants. Question What is an oxide? Tap to flip Answer A compound containing oxygen that is formed during an oxidation reaction. Question What is rusting? Tap to flip Answer The corrosion of iron or steel in the presence of water and oxygen. Question What is corrosion? Tap to flip Answer When a metal reduces in size because of a chemical reaction. Question Give one example of an oxidation reaction. Tap to flip Answer e.g. combustion or rusting. Question Which type of product is always formed in an oxidation reaction? Tap to flip Answer An oxide. Question What compound is rust a form of? Tap to flip Answer Iron oxide. Question What three things does combustion require? Tap to flip Answer Fuel, heat and oxygen; it will not happen without one of them. Question What is released when a fuel reacts with oxygen in combustion? Tap to flip Answer Energy. Question What is burning? Tap to flip Answer A type of combustion in which substances react with oxygen and produce visible flames. Question What is a fuel? Tap to flip Answer A substance that releases its stored energy when it undergoes combustion. Question Which product is often formed in a chemical reaction if oxygen and hydrogen atoms are present? Tap to flip Answer Water. Question Which product is often formed in a chemical reaction if oxygen and carbon atoms are present? Tap to flip Answer Carbon dioxide. Question What is a decomposition reaction? Tap to flip Answer A reaction in which a single compound breaks down into two or more products. Question Give one thing a decomposition reaction usually needs in order to occur. Tap to flip Answer e.g. heat, light or electricity. Question What do metal carbonates typically form when they decompose on heating? Tap to flip Answer Metal oxides and carbon dioxide gas. Question What is a precipitate? Tap to flip Answer An insoluble solid formed when two solutions react together. Question What does insoluble mean? Tap to flip Answer A substance will not dissolve in a particular solvent. Question What does the state symbol (aq) mean? Tap to flip Answer Aqueous solution: the substance is dissolved in water. Question What does the appearance of a precipitate show? Tap to flip Answer That a chemical reaction has occurred. Question Why are precipitation reactions important in water treatment? Tap to flip Answer They remove unwanted substances from water. Question What are precipitation reactions used for in qualitative analysis? Tap to flip Answer Identifying the presence of certain substances in a solution. Question What does a chemical qualitative analysis test tell you? Tap to flip Answer Whether a substance is present, not how much of it is present. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Science Unit Understanding chemical reactions England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Science lesson by Oak National Academy licensed under Open Government Licence (OGL)
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