The cards Question In a chemical equation, how can the arrow be read? Tap to flip Answer As 'changes into'. Question In a chemical equation, how can the + symbol be read? Tap to flip Answer As 'and'. Question In an oxidation reaction, what does a reactant combine with? Tap to flip Answer Oxygen. Question What happens to the reactant in a decomposition reaction? Tap to flip Answer It splits into two or more new substances. Question What is a reaction called in which an insoluble salt forms from two solutions? Tap to flip Answer A precipitation reaction. Question What does conservation of mass mean? Tap to flip Answer The combined mass of the starting reactants equals the combined mass of the products formed. Question What is a closed system? Tap to flip Answer One where matter cannot enter or leave; only energy can transfer between the system and its surroundings. Question What are the building blocks of all matter? Tap to flip Answer Atoms. Question Can a chemical reaction change an atom into a different type of atom? Tap to flip Answer No, that is impossible in a chemical reaction. Question Can a product be made if some of the atoms it needs are missing? Tap to flip Answer No; a product cannot be made without all the atoms it needs. Question Besides a closed system, what kind of system can the law of conservation of mass be applied to? Tap to flip Answer A non-enclosed system that takes in or gives out gas. Question What are the elements or compounds formed after a reaction has taken place called? Tap to flip Answer Products. Question What does a word equation use to represent a reaction? Tap to flip Answer The chemical names of the reactants and products. Question What does a symbol equation use to represent a reaction? Tap to flip Answer The chemical formulas of the reactants and products. Question What does a chemical formula show about a substance? Tap to flip Answer Its element symbols and the number or ratio of atoms of each element in it. Question What must be equal on both sides of a balanced symbol equation? Tap to flip Answer The number of atoms of each element. Question What is a coefficient in a chemical equation? Tap to flip Answer The number placed in front of a formula to balance the equation; it multiplies all the atoms in that formula. Question Besides balancing, what do the coefficients in an equation show? Tap to flip Answer The ratio of the substances in the reaction. Question When balancing an equation, can you change the chemical formulae? Tap to flip Answer No; only the coefficients can be changed. Question Can atoms be created or destroyed in a chemical reaction? Tap to flip Answer No; they are only rearranged into the products. Question What is the uncertainty of a measurement? Tap to flip Answer The range of measurements within which the true value can be expected to be found. Question Is there always some uncertainty when a measurement is made? Tap to flip Answer Yes, every measurement has some uncertainty. Question What is the resolution of a piece of apparatus? Tap to flip Answer The smallest change it can measure, shown by its markings. Question How big is the uncertainty of a single measurement compared with the device's resolution? Tap to flip Answer Half the resolution of the device used. Question How does a higher resolution affect the uncertainty of a single measurement? Tap to flip Answer It lowers the uncertainty. Question How do you find the uncertainty of a mean from repeated measurements? Tap to flip Answer Take half the range of the repeated measurements. Question How is a mean calculated? Tap to flip Answer Add up the values in a set of measurements and divide by the number of measurements. Question What is the relative formula mass (Mᵣ) of a substance? Tap to flip Answer The sum of the relative atomic masses of all the atoms in its formula. Question In a balanced equation, how does the sum of the reactants' relative formula masses compare with the products'? Tap to flip Answer They are equal, once the balancing coefficients are taken into account. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Chemistry Unit Calculations involving masses Exam boards AQA, Edexcel, OCR Tiers foundation and higher 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 Chemistry lesson by Oak National Academy licensed under Open Government Licence (OGL)
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