AQA GCSE Chemistry - Quantitative Chemistry Already Graded A+

AQA GCSE Chemistry - Quantitative Chemistry Already Graded A+ 1. What is Avogadro's constant? Answer: Avogadro's constant is the number of atoms, molecules, or ions in a mole of any substance, which is equal to 6.02 × 10^23 per mole. 2. How is concentration defined? Answer: Concentration is the amount of a substance dissolved in a given volume of liquid. 3. What is the limiting reactant in a chemical reaction? Answer: The limiting reactant is the reactant that is consumed first and stops the reaction from proceeding further. 4. What is a mole? Answer: A mole is the amount of substance in the relative atomic or formula mass of a substance in grams. 5. What is the relative atomic mass of an element? Answer: The relative atomic mass of an element is the average mass of its atoms compared to carbon 12, which has a mass of exactly 12 units. 6. What is the relative formula mass of a substance? Answer: The relative formula mass of a substance is the sum of the relative atomic masses of its elements, added up in the ratio shown in its chemical formula. 7. What is a balanced symbol equation? Answer: A balanced symbol equation is a symbol equation where there are equal numbers of each type of atom on both sides of the equation. 8. What is the law of conservation of mass? Answer: The law of conservation of mass states that the total mass of products formed in a reaction is equal to the total mass of reactants. 9. What is the mass number of an atom? Answer: The mass number of an atom is the sum of its protons and neutrons. 10. What is a product in chemistry? Answer: A product is a substance formed as a result of a chemical reaction. 11. What is a reactant in chemistry? Answer: A reactant is a substance used as starting material before a chemical reaction takes place. 12. What are state symbols used for? Answer: State symbols are used to indicate whether reactants and products are solid (s), liquid (l), gas (g), or dissolved in water (aq) in balanced symbol equations. 13. What is a symbol equation? Answer: A symbol equation is an equation that shows the chemical symbols and formulae of all reactants and products involved in a chemical reaction. 14. What is a word equation? Answer: A word equation is a way to describe what happens in a chemical reaction by showing the names of all reactants and products they form. Note: I've tried to rephrase the questions while keeping the same meaning and avoiding plagiarism.